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					                                                   DTFAWA-11-R-00834
                                                       Attachment J-10

    PART III – LIST OF DOCUMENTS, EXHIBITS AND OTHER ATTACHMENTS

ATTACHMENT J-10 – Generic Test Procedures




                                  J-10

                  Generic Test Procedures
                                                        DTFAWA-11-R-00834
                                                            Attachment J-10

       PART III – LIST OF DOCUMENTS, EXHIBITS AND OTHER ATTACHMENTS

ATTACHMENT J-10 – Generic Test Procedures


                    FUNCTIONAL TEST PROCEDURES
                   DISTANCE MEASURING EQUIPMENT (DME)




                                   Prepared by:

NATIONAL AIRWAY SYSTEMS ENGINEERING (NASE), NAVIGATION AND LANDING TEAM
                              (AJW-143)
                            P.O. BOX 25082
                        OKLAHOMA CITY, OK 73125




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DME SUBSYSTEM TEST PROCEDURES
TABLE OF CONTENTS
1.0 DME SUBSYSTEM TEST PROCEDURES
1.1 Documentation Area
1.1-1 Verify Documentation Availability
1.1-2 Verify Documentation Usability
1.1-3 Verify Documentation Adequacy
1.1-4 Verify Documentation Format
1.2 Installation Area
1.2-1 Verify Equipment Installation Criteria Compliance
1.2-2 Verify Equipment Installation Accuracy and Completeness
1.2-3 Evaluate Initial Startup and Preliminary Testing Capability
1.2-4 Evaluate Installation Procedures
1.3 Personnel Safety Area
1.3-1 Evaluate Personnel Safety - Static Inspection
1.3-2 Evaluate Personnel Safety - Inspection During O&M Performance
1.4 Modifications Area
1.4-1 Verify Final Equipment Configuration
1.4-2 Verify Absences of Test Modifications
1.5 Service Area
1.5-1 Verify DME Turn-On and Checkout Procedures
1.5-2 Verify DME Equipment Shutdown Procedures
1.5-3 Verify Standard Values
1.5-4 Verify Equipment is Operating within Standards and Tolerances
1.5-5 Verify DME Operational Procedures
1.5-6 Verify Equipment Operation on Backup Power
1.6 Periodic Maintenance Area
1.6-1 Verify Availability of Test Equipment, Accessories and Supplies
1.6-2 Verify Other Maintenance Tasks
1.7 Field Maintainability Area
1.7-1 Verify Onsite Corrective Maintenance Procedures
1.7-2 Verify Appropriate Action for Concurrent Multiple Faults
1.8 Training Area
1.8-1 Verify Operator and Maintainer Performance of Routine Duties
1.9 Logistics Area
1.9-1 Verify Availability of Onsite Spares
1.9-2 Verify Logistics Support
1.10 Security Area
1.10-1 Verify Physical Security of the Site
1.10-2 Verify Operational Security Practices
1.11 General Requirements
2.0 General Items
3.0 DME Performance Characteristics



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Attachment 1. Power Density Calculation
Attachment 2. Equipment Parameter Settings
Attachment 3. MTBF Analysis
Attachment 4. Receiver Sensitivity
Attachment 5. Capacity Analysis
Attachment 6. MTTR Analysis


1.0 DME SUBSYSTEM TEST PROCEDURES

The DME Subsystem test procedures address the DME Cabinet equipment. When the DME cabinet is
co-located with an ILS the DME interface will be verified.

1.1 Documentation Area

1.1-1 Verify Documentation Availability

Test Objective(s): Determine the availability of documentation. This includes the availability of MIB and
facility logs and forms.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team.

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: Verify the DME test director and evaluation team can locate current versions of the
MIB associated requisite hardware and software and any other documentation needed for system
operation and maintenance in the NAS.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that some on-site documentation is not available, then that discrepancy should be recorded under
this area.

a. Check for MIB availability.

b. Check, if applicable, for availability of all Site-specific Documentation (wiring diagrams, physical
equipment layouts, functional and equipment layouts and site-specific parameter settings).

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT Test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:


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��Yes
�� No
Comments (Must provide comments if “No”):
_____________________________________________________________________________________
_______________________________________________________________________
______________________________________________________________________________


1.1-2 Verify Documentation Usability

Test Objective(s): Determine the usability of documentation. This includes the usability of the MIB.
Note that formal verification of the usability of the MIB will be performed by AJW-143 as part of the In-
Process Reviews for the MIB. The purpose for this test in OT is to provide operators and maintenance
specialists an opportunity to evaluate the documents for the purpose of identifying latent usability defects
and potential usability improvements. Time efficiencies and the ability to gracefully back-out of
procedures should also be evaluated.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is
in a fully operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team will verify that they can
effectively utilize the MIB and that other on-site documentation is also usable.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that some on-site documentation is not usable or needs improved for usability, then that
discrepancy should be recorded under this area.

Check for MIB usability by following each major path through the table of contents for
maintenance intervals, periodic maintenance and corrective maintenance.

Data Collection, Recording and Reduction: A combination of Inspection (I) and Demonstration (D) will
be used to collect the test data. Data shall be recorded on OT Test Log Forms and any discrepancies shall
be recorded on Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may
be either hand-written or recorded electronically. When recording data on the Test Log Forms, address
each item in the respective Procedures section in
an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):


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Red lines to MIB from OT must be incorporated
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.1-3 Verify Documentation Adequacy

Test Objective(s): Determine the adequacy of documentation. This includes the adequacy and technical
accuracy of MIB, Maintenance Data, and System Documentation (forms and records etc.).

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team will verify that they are able to
effectively use the MIB, relevant site-specific documentation, and facility forms and records in
performing required duties. The DME test director and evaluation team will also verify that maintenance
data obtained from the DME is adequate for recording on required facility forms and records.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that some on-site documentation does not meet adequacy requirements, then that discrepancy
should be recorded under this area.

Check for MIB adequacy by accessing and evaluating the following sections of the MIB:

a. General Information and Requirements

b. Technical Description

c. Parts List

d. Troubleshooting Support Data (Drawings)

Data Collection, Recording and Reduction: A combination of Inspection (I) and Demonstration (D) will
be used to collect the test data. Data shall be recorded on OT Test Log Forms and any discrepancies shall
be recorded on Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may
be either hand-written or recorded electronically. When recording data on the Test Log Forms, address
each item in the respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No


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Comments (Must provide comments if “No”):
Incorporated Red lines.
_____________________________________________________________________________________
_____________________________________________________________________________________
________________________________________________________________


1.1-4 Verify Documentation Format

Test Objective(s): Determine the proper format of documentation. This includes the format of the MIB to
tailored requirements of FAA-D-2494/b. Note that formal verification of the format
of the MIB will be performed by AJW-143. The purpose for this test in OT is to provide an opportunity
to evaluate the documents for the purpose of evaluating readability and identifying latent defects and
potential improvements.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: Determine whether the MIB has been developed in accordance with tailored FAA-
D-2494/b requirements.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that some on-site documentation format needs improvement, then that discrepancy should be
recorded under this area.

Evaluate MIB format in accordance with tailored FAA-D-2494/b requirements.
Note: Tailored FAA-D-2494/b requires that manufactures pertinent data and instruction
but does not dictate format.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data.
Data shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________


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______________________________________________________________________________


1.2 Installation Area

1.2-1 Verify Equipment Installation Criteria Compliance

Test Objective(s): Determine compliance with equipment siting criteria.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: Documentation of and compliance to all site information criteria will be verified.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that there is some siting criteria noncompliance, then that discrepancy should be recorded under
this area.

Evaluate any site-specific data submitted by the installation group.
a. Evaluate that ident is connected per site specific requirements.

b. Evaluate that the system grounding complies with site specific requirements.

c. Verify proper authorized channel is used during test.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.2-2 Verify Equipment Installation Accuracy and Completeness



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Test Objective(s): The objective of this test is to verify the equipment is installed accurately and
completely.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The equipment is installed accurately and completely.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that there are problems in equipment installation accuracy or completeness, then that
discrepancy should be recorded under this area.

a. Evaluate equipment installation for any known or suspected problems.

b. Evaluate that AC power is in accordance with national electric codes and standards.

c. Evaluate cable labeling and dressing for cables installed in the field.

d. Evaluate that jumpers and switches are in correct position.

e. Evaluate the Installation sections of the DME MIB

  (1). Unpacking

  (2). Installation Procedures

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.2-3 Evaluate Initial Startup and Preliminary Testing Capability


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Test Objective(s): The objective of this test is to verify initial startup and checkout procedures.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is
in a fully operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: A digital multi-meter is required.

Evaluation Criteria: Startup and checkout procedures as documented in the DME MIB can be completed
without error.

Procedures:

a. Evaluate Initial Startup procedures as instructed by the DME MIB.

b. Evaluate Preliminary Testing procedures in the DME MIB including testing of equipment power
supply circuits, grounding, and equipment interfaces.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.2-4 Evaluate Installation Procedures

Test Objective(s): The objective of this test is to verify the installation procedures provided in the DME
MIB.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.


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Evaluation Criteria: Installation procedures as documented in the DME MIB can be
completed.

Procedures:
1. Evaluate the installation procedures in the DME MIB by performing the procedures.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.3 Personnel Safety Area

1.3-1 Evaluate Personnel Safety - Static Inspection

Test Objective(s): The objective of this test is to expose any electrical or mechanical items, practices or
environments that may be harmful to specialists or associated equipment.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: A static inspection reveals that personnel are not exposed to unsafe items or
environments that could cause harm to themselves or associated equipment.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that there may be a personnel safety problem, then that discrepancy should be recorded under
this area.

a. Evaluate electrical items via an electrical static inspection. Use FAA-G-2100H, Paragraph 3.3.5.1. as a
guideline.



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b. Evaluate mechanical items via a mechanical static inspection. Use FAA-G-2100H, Paragraph 3.3.5.f as
a guideline.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________



1.3-2 Evaluate Personnel Safety - Inspection During Operation and Maintenance Management
(O&M) Performance

Test Objective(s): The objective of this test is to determine the safety of personnel and associated
equipment by performing an inspection during operations and maintenance procedure performance.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: An inspection during operations and maintenance procedure performance reveals
that personnel are not exposed to unsafe items, practices, or environments that could cause harm to
themselves or associated equipment.

Procedures:

a. Evaluate normal operations and maintenance activities (as listed in the DME MIB) for unsafe
conditions. If necessary, carefully perform individual activities to determine unsafe conditions. Use
applicable sections of FAA-G-2100H, Paragraph. 3.3.5.1. as a guideline.

b. Evaluate any associated operations and maintenance procedure safety warnings and cautions in the
DME MIB.




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Data Collection, Recording and Reduction: Demonstration (D) and Inspection (I) will be used to collect
the test data. Data shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.4 Modifications Area

1.4-1 Verify Final Equipment Configuration

Test Objective(s): The objective of this test is to determine that the equipment is in its final configuration.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: There are no discrepancies with recorded serial numbers and version numbers of all
DME hardware and software.

Procedures:

a. Evaluate recorded serial numbers and version numbers of all DME hardware.

b. Evaluate recorded serial numbers and version numbers of all DME software. This includes operational
software, COTS software and any operational data files.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.




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Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.4-2 Verify Absences of Test Modifications

Test Objective(s): The objective of this test is to determine that no test modifications are
installed.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: Observe that there are no test modifications installed in the DME equipment and
document the status of any pending or ongoing approved hardware and software modifications.

Procedures:

a. Evaluate the status of any pending or ongoing contractor and /or FAA approved hardware and software
modifications.

b. Evaluate that no test modifications are installed in the DME, including unauthorized cuts or jumper
modifications to circuit card assemblies, etc.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No

Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________


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______________________________________________________________________________


1.5 Service Area

1.5-1 Verify DME Turn-On and Checkout Procedures

Test Objective(s): The objective of this test is to verify DME turn-on and checkout
procedures.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can successfully perform the turn-on and
checkout procedures in the DME MIB.

Procedures:

Evaluate the DME Installation, Integration, And Checkout in the DME MIB.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.5-2 Verify DME Equipment Shutdown Procedures

Test Objective(s): The objective of this test is to verify DME equipment shutdown
procedures.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is
in a fully operational configuration.


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Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can successfully perform the shutdown
procedures in the DME MIB.

Procedures:
1. Evaluate equipment shutdown procedures in the DME MIB by performing the procedure.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
No shut down procedure required.
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.5-3 Verify Standard Values

Test Objective(s): The objective of this test is to verify that standard values have been
established for all DME performance parameters.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can successfully verify that standard
values have been established for each DME performance parameter in the DME MIB.

Procedures:
Evaluate whether standard values have been established for each DME performance
parameter in the DME MIB.



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Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.5-4 Verify Equipment is Operating Within Standards and Tolerances

Test Objective(s): The objective of this test is to verify the DME is operating within standards and
tolerances.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can successfully verify that all
performance parameters are within the operational tolerance limits as established in the DME MIB.

Procedures:

a. Use the procedures and parameter values in the DME MIB to evaluate whether all DME performance
parameters are within the operational tolerance limits.

b. Evaluate conduct of performance checks at required intervals as established in the DME MIB by
performing each check. This includes those checks to inspect, observe, and measure.

c. Evaluate impact to system/subsystem operation and DME service when performance
checks are conducted.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.


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Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.5-5 Verify DME Operational Procedures

Test Objective(s): The objective of this test is to verify DME operational procedures.
Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can successfully perform the DME
operational procedures in the DME MIB.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that there are DME operation procedures which need improved, then that discrepancy should be
recorded under this area.

Evaluate DME operational procedures by performing each operational procedure in the
DME MIB which was not performed in 1.5.4.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________




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1.5-6 Verify Equipment Operation on Backup Power

Test Objective(s): The objective of this test is to verify the DME provides adequate
continuous service through the use of backup power.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: Observe the DME function successfully on backup power.

Procedures:

a. Cause the facility critical supply to the DME to cycle from the power company source to the local
backup source and cause the facility essential supply to the DME to cycle from the power company
source to the local backup source. If applicable.

b. Operate the DME for at least one half hour in this mode (on backup power) and through any other
transitions of critical power such as battery to generator switchover.

c. Cause the facility critical supply to the DME to cycle from the local backup source to the power
company source and cause the facility essential supply to the DME to cycle from the local backup source
to the power company source. If applicable.

d. Evaluate DME and DME performance parameters while transitioning to backup power, while on
backup power and while transitioning back to Power Company power. Record data during this complete
procedure in case detailed analysis is desired.

Data Collection, Recording and Reduction: Test (T) will be used to collect the test data. Data shall be
recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either
hand-written or recorded electronically. When recording data on the Test Log Forms, address each item
in the respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:
��Yes
�� No
Comments (Must provide comments if “No”):
_____________________________________________________________________________________
_____________________________________________________________________________________
________________________________________________________________


1.6 Periodic Maintenance Area


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1.6-1 Verify Availability of Test Equipment, Accessories and Supplies

Test Objective(s): The objective of this test is to verify required support and test equipment are available.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: Test equipment as required by the MIB.
No special test equipment is required.

Evaluation Criteria: The required test equipment can be located, is in calibration, and is
Accompanied with necessary technical manuals. Also the required accessories and supplies can be
located. These items are found in the “Equipment Required but not Supplied” tables in the MIB.

Procedures:
a. Evaluate calibration schedule for test equipment, is each item in calibration?

b. As required evaluate technical manuals for test equipment, are they all easily accessible?

c. Evaluate location of required accessories and supplies. Are they easily accessible and are all items
listed in the MIB available?

e. Evaluate whether the test equipment, accessories and supplies are adequate to perform all of the
performance checks, maintenance tasks and other on-site tasks. Also evaluate whether the quantity of
supplies and consumables is adequate.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
_____________________________________________________________________________________
_______________________________________________________________________


1.6-2 Verify Other Maintenance Tasks



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Test Objective(s): The objective of this test is to verify “other” maintenance tasks procedures.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: Test equipment as required by the MIB.
No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can successfully perform the “other”
maintenance tasks procedures.

Procedures:

a. Perform each “other” maintenance procedure in the DME MIB. This includes those tasks not included
in performance checks yet necessary to prevent deterioration of the system such as to lubricate, change,
adjust, calibrate, replace, or clean equipment at required intervals as established in the DME MIB. Were
these tasks successfully performed and were the equipment and supplies readily available to perform the
tasks?

b. Evaluate impact to system/subsystem operation and DME service when required “other” maintenance
procedures are performed.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________


1.7 Field Maintainability Area

1.7-1 Verify Onsite Corrective Maintenance Procedures

Test Objective(s): The objective of this test is to verify that onsite corrective maintenance
procedures can be successfully accomplished.



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Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: Test equipment as required by the MIB.

Evaluation Criteria: The DME test director and evaluation team can successfully perform fault isolation.
Perform DME corrective maintenance procedures in the DME MIB assisted by built-in diagnostic test.

Procedures:

a. Evaluate fault isolation by inserting faulty modules and then have the DME maintainer
find the fault with the MIB and built-in fault diagnostic test fault.

b. Evaluate associated DME corrective maintenance procedures in the DME MIB by
performing the procedures to find and correct each fault

Data Collection, Recording and Reduction: A combination of Demonstration (D) and Test (T) will be
used to collect the test data. Data shall be recorded on OT test Log Forms and any discrepancies shall be
recorded on Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be
either hand-written or recorded electronically. When recording data on the Test Log Forms, address each
item in the respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
Red lines to be incorporated.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________


1.7-2 Verify Appropriate Action for Concurrent Multiple Faults

Test Objective(s): The objective of this test is to verify appropriate action for concurrent multiple faults in
the DME equipment. The effectiveness of the MIB and built-in diagnostics in this area is the primary
concern however there could be an impact in training or other areas also.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.


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Evaluation Criteria: The DME maintainer takes appropriate action to resolve concurrent
multiple faults.

Procedures:
1. Evaluate concurrent multiple faults by introducing a number of concurrent multiple faults (especially
those which could be confusing) and have the DME maintainer use the
corrective maintenance procedures in the DME MIB and built-in diagnostics to find and
correct the faults.

Data Collection, Recording and Reduction: A combination of Demonstration (D) and Test (T) will be
used to collect the test data. Data shall be recorded on OT test Log Forms and any discrepancies shall be
recorded on Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be
either hand-written or recorded electronically. When recording data on the Test Log Forms, address each
item in the respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________


1.8 Training Area

1.8-1 Verify Operator and Maintainer Performance of Routine Duties

Test Objective(s): The objective of this test is to verify that formal training provides the necessary skills
for an operator and maintainer to perform routine duties related to the DME.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: Document the formal DME training received by the designated tester.
Observe the DME tester perform duties related to the DME and document any difficulties that were
caused by a lack of training or familiarity with the documentation, procedures, systems or equipment.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that there are issues associated with training, then that discrepancy should be recorded under this
area.


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a. Record the DME familiarization training each DME tester has received.

b. Observe DME tester activities and record (if any), the difficulties that were caused by lack
of training or familiarity with the documentation, procedures, system, or equipment. The test director and
evaluation team should determine whether activities to this point were sufficient to evaluate training or
whether additional activities should be performed.

c. Evaluate whether an adequate number of trained personnel are available at the site to support the DME.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
Formal training to follow per contract requirements.
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.9 Logistics Area

1.9-1 Verify Availability of Onsite Spares

Test Objective(s): The objective of this test is to verify that on site spares are available and secured in an
accessible location.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can locate and successfully determine
the status (quantity, identification, and configuration) of onsite spares.

Procedures:

a. Verify that the correct quantity and type of LRUs, if any are stored in the proper location onsite.


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b. Verify that each spare LRU/item is easily identified either on the part or in the MIB so that replacement
parts can be ordered.

c. Verify that each LRU/item is of current configuration.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________


1.9-2 Verify Logistics Support

Test Objective(s): The objective of this test is to verify that maintenance policy and processes are in place
and understood.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team can successfully initiate
spare replenishment actions.

Procedures:

a. Evaluate spare replenishment actions.

b. Document turn-around time for spare replenishment.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-



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written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.10 Security Area

1.10-1 Verify Physical Security of the Site

Test Objective(s): The objective of this test is to verify that the DME equipment is in a
physically secure location.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required

Evaluation Criteria: The entrances to DME equipment areas adequately restrict unauthorized personnel.

Procedures:

a. Evaluate entrances to DME equipment areas for security measures to adequately restrict unauthorized
personnel. It may be necessary to query other personnel on site to determine what doors are unlocked and
when. Also check any window locks.

b. Evaluate security of DME antenna installation.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No


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Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.10-2 Verify Operational Security Practices

Test Objective(s): The objective of this test is to verify that processes are in place that minimizes the
possibility of accidental or intentional shutdown or loss of service of the DME.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required.

Evaluation Criteria: The DME test director and evaluation team perform routine duties
according to established operational concepts.

Procedures: Procedures are listed below, however if during the course of complete OT testing it becomes
apparent that there are operational security practices which are questionable, then that discrepancy should
be recorded under this area.

a. Evaluate routine duties according to established operational concepts. Especially evaluate the duties of
the operator.

b. Evaluate proper use of passwords and processes to change DME system parameters.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


1.11        General Requirements


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Test Objective(s): The objective of this test is to verify DME system level functional
requirements for NAS operation and service capability.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director, evaluation team and designated tester.
Rick Astillero, Francisco Paredes, Carl Hawes, Greg Rugila.

Test Support Hardware, Software and Documentation: Test equipment is required as specified below:

The following (or equivalent) is required.
Digital Voltmeter – Fluke 87
Oscilloscope – Tektronics DPO 4000, 500 MHz, 4-channel
Frequency counter – Agilent 53131A-A030
Spectrum Analyzer – Agilent E4404B (with High Resolution option)
DC Power Supply +24 VDC – Global Specialties 1300
Arbitrary Waveform Generator – Tektronix AFG3252 with Trig Delay
Stop Watch – 1-second resolution, max capability in excess of 2 hours
Peak power meter – Agilent Model N1911A with power sensor N1921A
Battery powered AM radio
10, 20, 30, and 40 dB 10 watt (CW) attenuators – Narda 766
Signal Generator – Agilent E4432B with pulse modulation
24 dB Amplifier – Mini-Circuits – ZHL-2-12
Isolator – TRAK – 20C1361
IBM Compatible PC with DME software loaded.
DME Manufacturer instruction book part number XXXXXXX-XXX Verison x.x
Vector Network Analyzer – Anritsu MS2034A with Option 5, Option 10, Option 15, Option 25, Option
27 and Option 31.
Calibrated 3-port Directional Coupler for DME frequency Range
Variable Attenuator – Weinschel 940-114-2-12
SMA torque wrench, SMA adapters, i.e., SMA male to BNC female.
Emco 3102 and 3103 Biconical Antenna


The following test procedures and analyses are included as attachments to this document:

Attachment 1 - Power Density Calculation (Coverage Analyses), provided by the Manufacturer.

Attachment 2 - DME Antenna Information, provided by the Manufacturer.

Attachment 3 – Equipment Parameter Settings, provided by the Manufacturer.

Attachment 4 - MTBF Analyses, provided by the Manufacturer.

Attachment 5 – Receiver Sensitivity (Coverage Analyses), provided by the Manufacturer.


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Attachment 6 - Capacity Analyses, provided by the Manufacturer.

Attachment 7 – MTTR, provided by the Manufacturer.

Attachment 8 - OT Flight Test Procedure, the Manufacturer provide the system and FAA flight check the
system.

Evaluation Criteria: The DME designated tester and evaluation team, perform routine duties according to
established operational concepts.

2.0         General Items

2.1      Embedded RMM – The RMM system is described in the DME manufacturer instruction
book XXXXXX-XXXX

2.2          All testing is performed at 53Y unless specified otherwise in the procedure. The Power
Meter shall be connected to the output of the transmitter. Connect a directional coupler and connect the
attenuators needed to lower the output in order to meet the Peak Power Meter Sensor requirement. Refer
to section 7, Corrective Maintenance for each module Figure reference and for the PMDT set-up refer to
the MIB XXXXXX-XXXXX.


2.3         Current System Firmware/Software Version

The manufacturer should list of all the modules with firmware/software.

Module                                                 Baseline Firmware/Software
PMDT
BCPS
Transmitter/RCVR Interface
Monitor
RMS
Local or Remote Control Unit


3.0         DME Performance Characteristics

3.1        Test Procedures
The procedures are coordinated with the test procedures of FAA Specification FAA-E-2996.


3.2          Equipment Cabinet
Refer to the Figure 1, Typical HPDME Cabinet for locations of various modules described in the
procedures.




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                                  Figure 1. Typical HPDME Cabinet


3.3         Not used.


3.4         Not used.


3.5         Generalized Procedures


3.5.1       General Requirements


3.5.1.1     Modular Construction

Test Objective(s): The objective of this test is to verify the requirements of the DME equipment modular
construction.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: None.

Evaluation Criteria: Construction of the system consists of plug ins on easily replaceable sub-assemblies.

Procedures:

Inspect the DME system cabinet to verify the requirements from the DME specification.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):


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______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.2       Primary Power Source

Test Objective(s): The objective of this test is to verify the primary power source of the DME system.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is
in a fully operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: A digital multi-meter is required.

Evaluation Criteria: DME system operates on the specified power source.

Procedures:

Utilize the test support hardware to verify the DME system is powered with a 120 volt, 60 hertz power
source.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.3     Solid State Design

Test Objective(s): The objective of this test is to verify the DME system meet the solid state requirement.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is
in a fully operational configuration.

Test Personnel Requirements: Test director and evaluation team


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Test Support Hardware, Software and Documentation: A digital multi-meter is required.

Evaluation Criteria: DME equipment meets the requirement FAA-E-2996 paragraph 3.1.3.

Procedures:

Inspect the DME equipment LRUs to verify the requirements from the DME specification.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________

3.5.1.4     Test Points and Connectors

Test Objective(s): The objective of this test is to verify the test points and connectors meet requirements
as stated by the DME specification.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is
in a fully operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: None

Evaluation Criteria: Test points and connectors associated with the DME system meets the appropriate
requirements.

Procedures:

Inspect the DME system to verify that the test points and connectors meet the requirements from the
DME specification.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded


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electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.5     ILS /DME interlock.

            The ILS/DME interlock can be verified using the real ILS signal or by using a power supply
            to serve as an ILS interlock signal.

            a. Connect the ILS signal or power supply to the appropriate test points.

            b. Verify the system is in local or bypass. Ensure the system is ON and operating.

            c. Turn the Interlock back ON.

            d. Check the re-start function after its initial power sequence.

            e. Is the Interlock operation correct?
                ____ (YES/NO).


3.5.1.6     Battery Backup

            a. Ensure the transponder is operating on AC power with fully charged batteries.

            b. Remove AC power by turning off the AC circuit breaker.

            c. Start time measurement. Record start time: ______ AM or PM, stop time: _______AM
            or PM. Monitor the DME operation until the equipment turns off due to low voltage
            shutdown. Observe that after 4 hours the DME system remains operational on battery power.
            The DME shall not be in dummy load and the TRANSMISSION RATE should be set for
            2700 ppps.

            d. At this time, all of the PMDT operations, i.e. diagnostics tests, Monitor Integrity Test, and
            Routine Checks, transponder pulse characteristics and all the DME functions and data screens
            should be checked while the system is on batteries.




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            e. Are the transponder pulse characteristics, diagnostics test and monitor integrity test
            satisfactory? ______ (YES/NO)

            f. Is the System operational after 4 hours on battery back up? ______ (YES/NO)


3.5.1.7     Equipment Cabinet.

Test Objective(s): The objective of this test is to verify the requirements of the DME equipment cabinet.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: None.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.7.

Procedures:

Inspect the DME system cabinet to verify the requirements from the DME specification.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.8     DME Purpose.

Test Objective(s): The objective of this test is to verify the requirements of the DME purpose.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team


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Test Support Hardware, Software and Documentation: None.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.8.

Procedures:

The equipment manufacturer shall demonstrate the functionality of the equipment to verify the
requirements from the DME specification.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.9     Range.

Test Objective(s): The objective of this test is to verify the requirements of the DME equipment range.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.9.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement


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Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.10    Coverage.

Test Objective(s): The objective of this test is to verify the requirements of the DME system coverage.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.10.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


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3.5.1.11    Accuracy.

Test Objective(s): The objective of this test is to verify the requirements of the DME system coverage.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.10.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.11.1 System Accuracy

Test Objective(s): The objective of this test is to verify the requirements of the DME system Accuracy.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team




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Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.11.1.

Procedures:

Perform system accuracy test, analyze the data provided by the equipment manufacturer to verify the
requirements in the DME specification.

Data Collection, Recording and Reduction: Test (T) will be used to collect the test data. Data shall be
recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.11.2 DME Accuracy.

Test Objective(s): The objective of this test is to verify the requirements of the DME accuracy.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.11.2

Procedures:

Perform the DME accuracy test, analyze the data provided by the equipment manufacturer to verify the
requirements in the DME specification.

Data Collection, Recording and Reduction: Test (T) will be used to collect the test data. Data shall be
recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement


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Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.11.3 Transponder Capacity. This will verify operation with a 5400 or 4800 ppps interrogation
rate. The output of the transmitter will be monitored at the Transmitter detected output with a frequency
counter. The output rate (in pulse pairs per second) of the transmitter is the frequency counter reading
divided by 2(Not all systems are required to be divided 2).

            a. Use the PMDT to confirm the system is in the local control, bypass, or Operational or
            Maintenance mode. Confirm the system is operational.

            b. Connect the frequency counter to test point equivalent to Transmitter Detected Output on
            High Power Transmitter or Low Power Transmitter. See Figure 2, Transmitter Module
            below.

            c. Using appropriate test equipment inject 5400 (or 4800) ppps in the receiver.

            d. Measure the frequency of pulses on the Transmitter Detected Output on the High
            Power Transmitter or Low Power Transmitter Module. Do not use measurement
            during the ident period. Because this test point represents pulses from the
            transmitter, divide the result by 2 to obtain pulse pairs per second.

            Max. Transmission Rate ___________
            LIMIT: 4650 to 5400 ppps

            e. Verify that the reading in Frequency Counter divided by 2(if necessary) is
            approximately the same as the displayed on the Executive Monitor screen.

            f. Return the DME to normal operation.



                                    Figure 2. Transmitter Module


3.5.1.12    Maintainability Test Area.


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Test Objective(s): The objective of this test is to verify the maintainability of the DME equipment.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.12.

Procedures:

The equipment manufacturer shall demonstrate the functionality of the equipment to verify the
requirements from the DME specification.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.13    Reliability Test Area.

Test Objective(s): The objective of this test is to verify the requirements of the DME equipment reliability
test.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: None.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.13.


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Procedures:

The equipment manufacturer shall demonstrate the functionality of the equipment to verify the
requirements from the DME specification. Also, analyze the data provided by the equipment
manufacturer to verify the requirements in the DME specification.

Data Collection, Recording and Reduction: Analysis (A) and Demonstration (D) will be used to collect
the test data. Data shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.14    Continuity of Service.

Test Objective(s): The objective of this test is to verify the requirements for continuity of service of the
DME equipment.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.14.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded



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electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.15    Integrity of Signal.

Test Objective(s): The objective of this test is to verify the requirements in FAA-E-2996 for the integrity
of signal in the DME equipment.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.15.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


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3.5.1.16    Security Requirements and Data Security.

Test Objective(s): The objective of this test is to verify that the DME equipment data is secured,
protected, and the equipment contractor have incorporated safety features to prevent any malicious
interruption of DME services.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required

Evaluation Criteria: The minimum safety feature requirements are listed in FAA-E-2996 paragraph
3.1.16.

Procedures:

The equipment manufacturer shall demonstrate the functionality of the equipment to verify the
requirements from the DME specification.

Data Collection, Recording and Reduction: Demonstrate (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.17    Environmental Test Area.

            a. Confirm the DME is operating normally at room temperature.

            b. Place the unit in the environmental chamber with the PMDT connected externally.

            c. At 25 ºC record a reference set of PMDT data screens.


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            d. Set the chamber for 55 ºC and wait at least 1 hour at temperature to stabilize.

            e. Record a new set of reference PMDT data screens.

            f. Set the chamber for -10 ºC and wait at least 1 hour at temperature to stabilize.

            g. Record a new set of reference PMDT data screens.

            h. Power off the DME and wait at least 30 minutes for a cold soak.

            i. Turn on the DME and verify it start normally.

            j. Verify that the DME is operational and within operating tolerance at both temperature
            extremes.

            k. Compare the data at 55 ºC and -10 ºC to 25 ºC data to verify the transponder delay is
            meeting the accuracy of ±0.5 μsec over the service conditions.

            l. Return the DME to normal operating environment.

The equipment manufacturer shall provide data (i.e. from DQT Results) for review and analysis.


3.5.1.18    Electromagnetic Interference (EMI)

Test Objective(s): The objective of this test is to verify that the DME equipment meet the Electromagnetic
Interference (EMI) in MIL-STD-461 as specified in FAA-E-2996.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.18.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded


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electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.18.1 Electromagnetic Compatibility (EMC)

Test Objective(s): The objective of this test is to verify that the DME equipment meet the Electromagnetic
Compatibility (EMC) as specified in FAA-E-2996.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.1.18.1

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


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3.5.1.19    Operation of Overload Protective Devices

Test Objective(s): The objective of this test is to verify that the DME equipment meet the requirement in
FAA-G-2100, paragraph 3.1.16 and as specified in FAA-E-2996.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required

Evaluation Criteria: The grounding and bonding requirements are specified in FAA-G-2100 and FAA-E-
2996 paragraph 3.1.19.

Procedures:

The equipment manufacturer shall demonstrate the functionality of the equipment to verify the
requirements from the DME specification.

Data Collection, Recording and Reduction: Demonstrate (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.20    Static Discharge

Test Objective(s): The objective of this test is to verify that the DME equipment meet static discharge in
FAA-G-2100, paragraph 3.2.6 as specified in FAA-E-2996.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team


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Test Support Hardware, Software and Documentation: No special test equipment is required

Evaluation Criteria: The grounding and bonding requirements are specified in FAA-G-2100 and FAA-E-
2996 paragraph 3.1.20.

Procedures:

The equipment manufacturer shall demonstrate the functionality of the equipment to verify the
requirements from the DME specification.

Data Collection, Recording and Reduction: Demonstrate (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.1.21    Grounding and Bonding

Test Objective(s): The objective of this test is to verify that the DME equipment meet the requirement in
FAA-G-2100, paragraph 3.1.9 and as specified in FAA-E-2996.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: No special test equipment is required

Evaluation Criteria: The grounding and bonding requirements are specified in FAA-G-2100 and FAA-E-
2996 paragraph 3.1.21.

Procedures:

The equipment manufacturer shall demonstrate the functionality of the equipment to verify the
requirements from the DME specification.



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Data Collection, Recording and Reduction: Demonstrate (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.2       Transponder Requirement.

3.5.2.1     Operating Channels.

This procedure measures the DME transponder frequency. Some of the LPDME and HPDME transmitter
and receiver use the same frequency synthesizer. Paragraphs 3.5.2.1a and 3.5.2.1b will show that the
LPDME and HPDME will operate on various channels.

3.5.2.1a    Transmitter Frequency.

            a. Ensure the DME is in NORMAL operation.

            b. Log ON to the PMDT.

NOTE: For TEST PURPOSES, AC/DC power must be removed from the module before removing
the module from the cardcage.

            c. Remove the HPDME or LPDME module from the system if necessary. In most DME
            system with test point available for this measurement, this step is not needed.

            d. Connect the frequency counter to the appropriate RF connector in the DME system. Use
            the appropriate adapter if necessary.

            e. Measure and record the frequency. Verify that the frequency is within the requirement of
            FAA-E-2996 paragraph 3.2.1.1.

            Channel 53Y Measured Frequency ____________
            LIMIT: 1139.9886 MHz to 1140.0114 MHz




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Note: Before returning the DME to NORMAL operation, complete the frequency stability test, 3.5.2.1b.

             f. Replace the low-power transmitter module and restore the system to NORMAL operation.

3.5.2.1b     Frequency Stability - Select the channels listed below. Refer to the MIB for the frequency
             change.

             a. Verify the measurement and record the frequency.

             Channel     Nominal RF freq.        Measured          Limit
             1X          962 MHz                 ___________       961.99038MHz to 962.00962MHz
             63X         1024 MHz                ___________       1023.98976MHz to 1024.01024MHz
             1Y          1088 MHz                ___________       1087.98912MHz to 1088.0188MHz
             63Y         1150 MHz                ___________       1149.9885MHz to 1150.0115MHz
             126X        1213 MHz                ___________       1212.98787MHz to 1213.01213MHz


             b. Return DME to the assigned channel (53Y).

             c Restore the DME system to NORMAL operation.

3.5.2.1.1    Channel Frequency and Stability.

             Verify the readings in paragraph 3.5.2.1a and 3.5.2.1b meet the requirement in FAA-E-2996.

3.5.2.2      Receiver and Video Circuitry.

3.5.2.2.1    Receiver Bandwidth and Stability.


             a. Log ON to the PMDT.

             b. Using PMDT, bypass the DME (place the DME in LOCAL or Maintenance Mode).

             c. Using appropriate test equipment, inject a signal at the required receiver
             sensitivity level plus 3 dB and offset frequency as required in FAA-E-2996.

             c. Record the Reply Efficiency reading for +200 KHz offset ________%.
             LIMIT: 70% Min.

             d. Change the offset frequency -200 KHz

             e. Record the Reply Efficiency reading for -200 KHz offset ________%.
             LIMIT: 70% Min.

             f. Using appropriate test equipment, inject a signal at -10 dBm and offset frequency
             +900 KHz.


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             g. Connect the frequency counter to Transmitted Detected Output Pulse in High Power or
             Low-power transmitter module (refer to Figure 1).

             h. Measure and record the number of replies___________
             LIMIT: 10% Max.

             i. Using appropriate test equipment, inject a signal at -10 dBm and offset frequency -
             900 KHz.


             j. Measure and record the number of replies___________
             LIMIT: 10% Max.

             k. Return the DME to NORMAL operation.


3.5.2.2.1.1 Receiver Bandwidth.

             Inspection of procedure 3.5.2.2.1 shall verify the requirement in FAA-E-2996.

3.5.2.2.2    Receiver Decoder

             a. Confirm the DME is in NORMAL operation.

             b. Log ON to the PMDT. Ensure the DME is in X channel operational mode.

             c. Using appropriate test equipment, inject a signal at the required receiver
             sensitivity level plus 1 dB and pulse spacing of 11.5 μsec as required in FAA-E-2996.

             d. Record the Reply Efficiency reading with 11.5 μsec ________%.
             LIMIT: 70% Min.

             e. Change the spacing to 12.5 μsec.

             f. Record the Reply Efficiency with 12.5 μsec_______%
             LIMIT: 70% Min.

             g. Change the DME to Y channel. Change the spacing in the test equipment change
             the pulse spacing to 35.5 μsec.

             h. Record the Reply Efficiency with 35.5 μsec______%
             LIMIT: 70% Min.

             i. Change the spacing in the test equipment to 36.5 μsec.

             j. Record the Reply Efficiency with 36.5 μsec______%


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            LIMIT: 70% Min.

            k. Return the DME to NORMAL operation.


3.5.2.2.2.1 Decoding Circuit Performance.

            a. Confirm the DME is in NORMAL operation.

            b. Log ON to the PMDT. Ensure the DME is in X channel operational mode. Confirm the
            DME is operating in mode X with a receiver sensitivity setting of -94 dBm.

            c. Using PMDT, put the DME in local control, bypass, maintenance mode.

            d. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
            Equipment. Connect frequency counter to Detected Output Pulse in the DME TX module.

                                                          40dB
                                                       30dB




          Arb Generator
          Tek AFG3252
            1 out 2 out   Trig


                                                  DME
         RF Generator      Ext2
     I                     input
         HP E4432B        LF out
                                                  RCVR Mon1
                          RF out
                                             XX



            Oscilloscope                                       Trig

                    CH1   Aux
                      CH2                                     Mon YY




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                            Figure 3. Receiver External Test Equipment

           e. Configure the Arbitrary Generator as follows:

           Channel 1:             OFF

           Channel 2:             ON
           Function:              Pulse
           Period:                12 μsec
           High Level:            2V
           Low Level:             0V
           Width:                 3.5 μsec
           Run Mode:              Burst, 1 Cycle
           Trigger:               External Source, Negative Edge, 40 μsec Delay

           f. Configure the RF Generator as follows:

           Amplitude Offset:      Calibrate the cable and directional coupler then enter the actual value.

To calibrate, remove receiver connect spectrum to receiver backplane. Set RF generator 0 dB. Measure
loss signal generator to receiver.

Note: The Amplitude Offset needs to be calculated at each site.

           Frequency:             DME Receiver Fo (1077 MHz Rx, 1014MHz Tx for X-mode)
           Amplitude:             -88 dBm (+ offset)
           Ampl, ALC:             OFF
           Pulse:                 ON
           Pulse Source:          Ext2 DC
           AM:                    OFF
           MOD:                   ON
           RF:                    ON

           g. Configure the Oscilloscope as follows:

           CH1:                   0.5V/div
           CH2:                   0.5V/div
           Timebase:              20μsec/div
           Trigger                Aux, edge, TTL Level

           h. Looking at CH2 on the oscilloscope, verify that a single pulse is observed before the
           monitor efficiency interrogation.
           Screen Capture file____________

           i. Verify the reply efficiency is ≥95% or the transmitter rate is >3600 ppps. _______

           j. On the Arbitrary Generator, change the trigger delay to 54 μsec.


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           k. Looking at CH2 on the oscilloscope, verify that a single pulse is observed between the
           monitor efficiency interrogation pulses.
           Screen Capture file___________

           l. Verify the reply efficiency is ≥95% or the transmitter rate is >3600 ppps.

           m. On the Arbitrary Generator, change the trigger delay to 68 μsec.

           n. Looking at CH2 on the oscilloscope, verify that a single pulse is observed after the
           monitor efficiency interrogation.
           Screen Capture file_____________

           o. Verify the reply efficiency is transmitter rate is >3600 ppps.

           p. Return the DME to NORMAL operation.


3.5.2.2.2.2 Decoder Rejection Pulse Spacing.

           a. Confirm the DME is in NORMAL operation.

           b. Log ON to the PMDT. Ensure the DME is in X channel operational mode.

           c. Using appropriate test equipment, inject a signal at the required receiver
           sensitivity level plus 1 dB and pulse spacing of 11.0 μsec as required in FAA-E-2996.

           d. Record the Reply Efficiency reading with 11 μsec ________%.
           LIMIT: 70% Min.

           e. Change the spacing in the test equipment to 12.5 μsec.

           f. Record the Reply Efficiency with 12 μsec_______%
           LIMIT: 70% Min.

           g. Change the DME to Y channel. Change the spacing in the test equipment change
           the pulse spacing to 35 μsec.

           h. Record the Reply Efficiency with 35 μsec______%
           LIMIT: 70% Min.

           i. Change the spacing in the test equipment to 37 μsec.

           j. Record the Reply Efficiency with 37 μsec______%
           LIMIT: 70% Min.




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           k. Change the DME to X channel. Change the signal level to -10 dBm and the pulse
           spacing to 10 μsec.

           l. Record the Reply Efficiency with 10 μsec______%
           LIMIT: ≤5 % .

           m. Change the spacing in the test equipment to 14 μsec.

           n. Record the Reply Efficiency with 14 μsec______%
           LIMIT: ≤ 5%

           o. Change the DME to Y channel. Change the pulse spacing in the test equipment to
           34 μsec.

           p. Record the Reply Efficiency with 34 μsec______%
           LIMIT: ≤5 %.

           q. Change the spacing in the test equipment to 38 μsec.

           r. Record the Reply Efficiency with 38 μsec______%
           LIMIT: ≤5 %.

           s. Change the DME to X channel. Change the spacing in the test equipment to 9 μsec.

           t. Record the Reply Efficiency with 9 μsec______%
           LIMIT: ≤5%.

           u. Change the spacing in the test equipment to 15 μsec.

           v. Record the Reply Efficiency with 15 μsec______%
           LIMIT: ≤5%.

           w. Change the DME to Y channel. Change the spacing in the test equipment to 33
           μsec.

           x. Record the Reply Efficiency with 33 μsec______%
           LIMIT: ≤5 %.

           y. Change the spacing in the test equipment to 39 μsec.

           z. Activate the Start button and record the Reply Efficiency with 39 μsec______%
           LIMIT: ≤5 %.

           aa. Stop the test and return the DME to NORMAL operation.


3.5.2.2.2.3 Decoder Rejection Pulse Width.


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           a. Confirm the DME is in NORMAL operation.

           b. Log ON to the PMDT. Ensure the DME is in X channel operational mode. Confirm the
           DME is operating in mode X with a receiver sensitivity setting of -94 dBm.

           c. Using PMDT or Local Control, place the DME in local control, bypass or
           maintenance mode.

           d. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
           Equipment.

           e. Configure the Arbitrary Generator as follows:

           Channel 1:             OFF

           Channel 2:             ON
           Function:              Pulse
           Period:                11.5 μsec
           High Level:            2V
           Low Level:             0V
           Width:                 0.8 μsec
           Run Mode:              Burst, 2 Cycle
           Trigger:               External Source, 10 μsec Delay

           f. Configure the RF Generator as follows:

           Amplitude Offset:      Calibrate the cable and directional coupler then enter the actual value.

Note: The Amplitude Offset needs to be calculated at each site.

           Frequency:             DME Receiver Fo (1077 MHz Rx, 1014MHz Tx for X-mode)
           Amplitude:             -14 dBm (-94 dBm +80 dB)
           Ampl, ALC:             OFF
           Pulse:                 ON
           Pulse Source:          Ext2 DC
           AM:                    OFF
           MOD:                   ON
           RF:                    ON

           g. Configure the Oscilloscope as follows:

           CH1:                   0.5V/div
           CH2:                   0.5V/div
           Timebase:              20μsec/div
           Trigger                Aux, edge, TTL Level



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         h. Log On to the PMDT and select Executive Monitor if available. In DME system, where
         an executive monitor is not available, use a frequency counter connected to the TX detected
         output pulse.

         i. Looking at CH2 on the oscilloscope, verify that a narrow-pulse pair is observed prior to the
         monitor efficiency interrogation.
         Screen Capture file___________

         j. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

         k. On the Arbitrary Generator, change the period 12.5 μs.

         l. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

         m. On the Arbitrary Generator, change the following settings:

         Run Mode:               Burst, 1 Cycles
         Period:                 20 μs
         Width:                  11.5 μs

         n. Looking at CH2 on the oscilloscope, verify that a single wide pulse is observed prior to
         the monitor efficiency interrogation.
         Screen Capture file__________

         o. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

         p. On the Arbitrary Generator, change the period to 12.5 μs.

         q. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

         r. Reconfigure the DME for Y-Channel Operation.

         s. On the Arbitrary Generator, change the following settings:

         Run Mode:               Burst, 2 Cycles
         Period:                 35.5 μs
         Width:                  0.8 μs
         Trigger:                26 μs Delay

         t. Looking at CH2 on the oscilloscope, verify that a narrow-pulse pair is observed
         interweaved to the monitor efficiency interrogation.
         Screen Capture file_____________

         u. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

         v. On the Arbitrary Generator, change the period to 36.5 μs.
         Screen Capture file_____________


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             w. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

             x. On the Arbitrary Generator, change the following settings:

             Run Mode:              Burst, 1 Cycles
             Period:                40 μs
             Width:                 35.5 μs
             Trigger:               9.95 ms Delay

             y. Looking at CH2 on the oscilloscope, verify that a single wide pulse is observed prior to
             the monitor efficiency interrogation.
             Screen Capture file_______________

             z. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

             aa. On the Arbitrary Generator, change the width to 36.5 μs
             Screen Capture file____________

             ab. Verify the Efficiency parameter on the PMDT Executive Monitor is ≥95%.

             ac. Return the DME normal operation.

3.5.2.2.3    Receiver Dead Time.

             a. Confirm the DME is in NORMAL operation.

             b. Log ON to the PMDT. Ensure the DME is in X channel operational mode. Confirm the
             DME is operating with a receiver sensitivity setting of -94 dBm, default dead time gate of 60
             μs.

             c. Using PMDT enter the Maintenance Mode.

             d. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
             Equipment.

             e. Configure the Arbitrary Generator as follows:

             Channel 1:             OFF

             Channel 2:             ON
             Function:              Pulse
             Period:                12 μsec
             High Level:            2V
             Low Level:             0V
             Width:                 3.5 μsec
             Run Mode:              Burst, 2 Cycle


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         Trigger:                External Source, Negative Edge, 70 μsec Delay

         e. Configure the RF Generator as follows:

         Amplitude Offset:       Calibrate the cable and directional coupler then enter the actual value.

         Frequency:              DME Receiver Fo (1077 MHz)
         Amplitude:              -12 dBm (Highest level achievable with RF generator)
         Ampl, ALC:              OFF
         Pulse:                  ON
         Pulse Source:           Ext2 DC
         AM:                     OFF
         MOD:                    ON
         RF:                     ON

         f. Configure the Oscilloscope as follows:

         CH1:                    0.5V/div
         CH2:                    0.5V/div
         CH3:                    Half amplitude test point XX, 5V/div
         CH4                     Dead time gate, test point XX, 5V/div
         Timebase:               40μsec/div
         Trigger                 Aux, edge, TTL Level

         g. Log On to the PMDT and select Executive Monitor.

         h. Looking at CH4 on the oscilloscope, verify that dead time gate is 60±1μs and that it
         follows the falling edge of the second half amplitude pulse.
         Screen Capture file________________

         i. Verify that no reply is generated to the large signal interrogation as shown in the Receiver
         video.

         j. On the Arbitrary Generator, change the trigger delay to 120 μs.

         k. Verify that no reply is generated to the large signal interrogation as shown in the receiver
         video.
         Screen Capture file____________

         l. On the Arbitrary Generator, change the trigger delay to 130 μs.

         m. Verify that a reply is generated to the large signal interrogation as shown in the receiver
         video.
         Screen Capture file_____________

         n. Turn off the external RF generator.



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             o. Log On with the PMDT and change the Dead Time to the minimum setting.

             p. Use the oscilloscope to verify the dead time with 50±1μs. _______ μs
             Screen Capture file_____________

             q. At the PMDT change the Dead Time to the maximum setting.

             r. Use the oscilloscope to verify the dead time is 150±1μs.
             Screen Capture file_____________

             s. Return the DME to normal operation.


3.5.2.2.4    Receiver Recovery Time

             a. Connect an oscilloscope probe to Half amplitude test point XX.

             b. Confirm the DME is in NORMAL operation.

             c. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             e. Using PMDT put the DME in Local Mode, bypass or maintenance mode. From
             the Transponder or transmitter setting screen, set the Short Echo Suppression to
             OFF (squitter may have to be set to zero) and set the Thr. Lg. Dist. Echo for 0 dB.

             f. Set appropriate test equipment signal level as required in FAA-E-2996.

             g. Record the efficiency reading.
             Recovery time efficiency _________%
             LIMIT: 70% Min.

             This test generates a single interfering pulse instead of an invalid pulse pair spacing.
             The expected results are identical since single pulses are rejected at the same levels as
             invalid pulse pairs.

             h. Using the oscilloscope, verify the average time from the leading edge of the first two
             pulses is 8 ±1μs.
             Screen Capture file___________




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                                             40 dB
                                           Attenuator



                                 3 dB       20 dB
                              Attenuator   Coupler


                                            10 dB
                                                        Isolator                  RF Generator
                                           Coupler

                                                                                             Pulse Mod In
                                           Power                                 Channel 1   Main Out
              Monitor Probe                Meter           110 VAC


                                                                                Arbitrary Generaor


                                                                                      SYS
                                                                                      TRIG
                                                            Monito test point




                 PMDT                       DME




                      Figure 4. Test Equipment Set Up for HPDME and LPDME



                                                            NOTE
3.5.2.2.5    Echo Suppression.


3.5.2.2.5.1 Short Distance Echoes.

             a. Confirm the DME is in NORMAL operation.

             b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             c. Using PMDT put the DME in Local Control, bypass or maintenance mode. From
             the DME system setting screens, set the Short Echo Suppression to ON (squitter
             may have to be set to zero) and set the Thr. Lg. Dist. Echo for 0 dB.

             d. Set up the test equipment to appropriate signal level as required in FAA-E-2996.

             e. Connect Channel 1 to the detected video test point XX in the DME system. Connect
             Channel 2(B) of the scope to transmitter detected output pulse, test point XX in the
             transmitter module. Trigger (or SYNC) scope from appropriate test point XX in the DME
             system. Set the scope time base to 10 or 20 μsec.


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            f. Using the scope time measurement and cursors, measure the time from the 50% point of
            the rising edge of the first pulse on the receiver test point (CH1) to the 50% point of the rising
            edge of the first pulse on the transmitter test point (CH2).

Initial Reply Delay Measurement _____________
LIMIT: 50 ±0.5 μsec for X channel.




                                       Figure 5. Receiver Module

           i. Using the table below perform all of the required measurements, recording the delay error
as measured on the oscilloscope and TRANSMISSION RATE as measured on the PMDT.


                                         Test Power = - 84 dBm

Echo                                                Echo Delay
Level

0      *
-3
-6
-9
*Denotes recording waveform for report.

            j. Change the Int. sig. Level to -50 dBm and repeat the echo measurement.


                                         Test Power = - 50 dBm

Echo                                                Echo Delay
Level

0
-3     *
-6
-9
*Denotes recording waveform for report.

            k. Change Int. sig. Level to -10 dBm and repeat the echo measurement.




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                                         Test Power = - 10 dBm

Echo                                               Echo Delay
Level

0
-3
-6     *
-9
*Denotes recording waveform for report

            l. Return the DME to normal operation.


3.5.2.2.5.2 Long Distance Echoes.

            a. Confirm the DME is operating in mode X with a receiver sensitivity setting of -94 dBm.

            b. Connect the scope CH1 to the receiver log video, test point XX (provide the figure X) and
            connect trigger to appropriate test point XX.

            c. Connect the frequency counter to detected output pulse in the e transmitter module (refer
            to figure 2).

             d. Set up the Arbitrary Generator for X channel pulse pair, set appropriate trigger delay (183
or 175 μsec). Set the Signal Generator for external modulation and output frequency of Fo MHz and
output level of -50 dBm + cable loss.

            e. Using PMDT, using the DME system setting. Set the Long Distance Echo to -60
            dBm and set Antiecho Duration to 150 μsec ( if available).

            f. Using the appropriate test equipment, inject the signal level as required in FAA-E-2996.

            g. Measure and record the counter reading.
            Counter reading with Long Distance Echoes outside suppression window ______
            LIMIT: 2800 Min.

            h. In the scope, measure and record the reading _______150 ±5 μsec.

            i. Set up the Arbitrary Generator for X channel pulse pair, set appropriate trigger delay (133
            or 125 μsec).

            j. Measure and record the counter reading.
            Counter reading with Long Distance Echoes outside suppression window ______
            LIMIT: 2200 Max.



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           k. In the scope, measure and record the reading _______μsec


           l. Set the Signal Generator for external modulation and output frequency of Fo 1077 MHz
           and output level of -43 dBm + cable loss.

           m. Measure and record the counter reading.
           Counter reading with Long Distance Echoes outside suppression window ______
           LIMIT: 2800 Min.

           n. In DME system setting, set the Long. Distance Echo to 0 dBm.

           o. Return the DME to NORMAL operation.


3.5.2.2.5.2.1 Echo Suppression Disable.

           a. Confirm the DME is in NORMAL operation.

           b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
           dBm.

           c. Using PMDT, put the DME in Local Mode, bypass or maintenance mode. From
           DME system Setting, set the Short Echo Suppression to OFF (squitter may have to
           be set to zero) and set the Long. Distance Echo for 0 dB.

           d. Set up test equipment as required in FAA-E-2996.


           e. Connect Channel 1 (A) of the oscilloscope to the Log Video test point XX in the
           transponder. Connect Channel 2(B) of the scope to transmitter detected output, test point XX
           in the transmitter module. Trigger (or SYNC) scope from appropriate test point, XX. Set the
           scope time base to 10 or 20 μsec.

           f. Using the scope time measurement and cursors, measure the time from the 50% point of
           the rising edge of the first pulse on the receiver test point (CH1) to the 50% point of the rising
           edge of the first pulse on the transmitter test point (CH2).

Initial Reply Delay Measurement _____________
LIMIT: 50 ±0.5 μsec for X channel.

           g. Verify the TRANSMISSION RATE is not 100 in the PMDT executive monitor (if
           available).


           h. Connect the scope CH1 to the receiver log video, test point XX and connect trigger to the
           appropriate test point XX.


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             i Connect the frequency counter to detected output pulse in the transmitter module, test point
             XX.

             j. Set up the Arbitrary Generator for X channel pulse pair, set appropriate trigger delay (183
             or 175 μsec). Set the Signal Generator for external modulation and output frequency of Fo
             MHz and output level of -50 dBm + cable loss.

             k. Using PMDT, DME system setting, set the Long. Distance Echo to 0 dBm and set
             Antiecho Duration to 150 μsec.

             l. Set up the test equipment as required in FAA-E-2996.

             m. Measure and record the counter reading.
             Counter reading with Long Distance Echoes outside suppression window ______

             n. In the scope, verify that Long Distance Echoes are generated _______YES/NO.

3.5.2.2.5.3 DME Traffic Load Monitoring

Verified this procedure is confirmed in procedures 3.5.2.2.5.1 and 3.5.2.2.5.2.


3.5.2.2.6    Receiver Sensitivity.

             a. Confirm the DME is in NORMAL operation.

             b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             c. Using PMDT, set DME system to Local Control, bypass or maintenance mode.

             d. Using appropriate test equipment, inject a signal at the required receiver
             sensitivity level as required in FAA-E-2996.

             e. Connect the frequency counter to the transmitter output detected pulse, test point
             XX.

             f. Observe the RESULT in the frequency counter, and executive monitor of the PDMT while
             incrementally decreasing the level until the value read for Reply Efficiency starts to go less
             than but the average is still greater than 70 percent. Verify the receiver sensitivity is better
             than -94 dBm on the PMDT. _________

             g. Ensure the DME is NORMAL operation.

             h. Change the spacing to 11 μsec in the test equipment. The signal level at -94 dBm.
             Measure and the reply efficiency.


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            Efficiency Interrogations with 11 μsec spacing ___________
            LIMIT: 70% Min.

            i. Change the spacing to 13 μsec. Measure and record the reply efficiency.
            Efficiency Interrogations with 13 μsec spacing ___________
            LIMIT: 70% Min.

            j. Return the DME to NORMAL operation.


3.5.2.2.6.1 On Channel Sensitivity

Refer to 3.5.2.2.6 step a through e.


3.5.2.2.6.1.1 Sensitivity Variations w/Interrogation Loading

            a. Confirm the DME is in NORMAL operation.

            b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
            dBm.

            c. Using PMDT, set DME system for Local Control, bypass or maintenance mode.

           d. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
        Equipment. The trigger for the Arbitrary Generator should be hooked to Ch1 of the Arbitrary
        Generator.

            e. Configure the Arbitrary Generator as follows:

            Channel 1:                 ON
            Function:                  Square
            Frequency:                 5 kHz
            High Level:                2V
            Low Level:                 0V
            Run Mode:                  Continuous

            Channel 2:                 ON
            Function:                  Pulse
            Period:                    12 μsec
            High Level:                2V
            Low Level:                 0V
            Width:                     3.5 μsec
            Run Mode:                  Burst, 2 Cycles
            Trigger:                   External Source, Negative Edge, 0 μs Delay (hooked to CH1)

            f. Configure the RF Generator as follows:


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           Amplitude Offset:       Calibrate the cable and directional coupler then enter the actual value.

           Frequency:              DME Receiver Fo (1077 MHz)
           Amplitude:              -94 dBm
           Ampl, ALC:              OFF
           Pulse:                  ON
           Pulse Source:           Ext2 DC
           AM:                     OFF
           MOD:                    ON
           RF:                     ON

           g. Turn off the RF Generator to record the reference sensitivity. ________

           h. Put the DME in Local Control, bypass or maintenance mode.

           i. On the PMDT, check the executive monitor screen (if available). In DME system without
           this function, use a frequency counter connected to the detected output pulse in the
           transmitter module, test point XX.
           Record the reference Receiver Sensitivity__________.
           Screen Capture File ____________

           j. Turn on the RF generator. Wait for 10 seconds for the data to be collected.

           k. Record the Receiver Sensitivity at 90% loading________. Verify the change is ≤1 dB.

           l. Set CH1 of the Arbitrary Generator to 2.7 KHz. Wait for a complete set of new data to be
           collected.

           m. Record the Receiver Sensitivity at 50% transmitter loading________. Verify the change
           is ≤1 dB.

           n. Set CH1 of the Arbitrary Generator to 1.35 KHz. Wait for a complete set of new data to
           be collected.

           o. Record the Receiver Sensitivity at 25% transmitter loading________. Verify the change
           is ≤1 dB.

           p. Return the DME to NORMAL operation.


3.5.2.2.6.1.2 Sensitivity at Other Pulse Spacing

           a. Refer back to the test procedure in paragraph 3.5.2.2.6.

           b. Set the sensitivity level to -94 dBm.



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           c. Verify the efficiency tests for the reference plus 1 dB @±0.5μs are greater than 70%.
           ________70% minimum.

           d. Verify the efficiency tests for the reference plus 77 dB @±3.0 μs are less than 5%.
           __________5% maximum

           d. These test verify the system meets the requirement FAA-E-2996.


3.5.2.2.6.1.3 Desensitization by Adjacent Channel Interrogation

           a. Confirm the DME is in NORMAL operation.

           b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
           dBm.

           c. Using PMDT, put the DME in Local Control, bypass or maintenance mode.

           d. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
           Equipment. The trigger for the Arbitrary Generator should be hooked to Ch1 of the Arbitrary
           Generator.

           e. Configure the Arbitrary Generator as follows:

           Channel 1:             OFF

           Channel 2:             ON
           Function:              Pulse
           Period:                12 μs
           High Level:            2V
           Low Level:             0V
           Width:                 3.5 μs
           Run Mode:              Burst, 2 Cycles
           Trigger:               External Source, Negative Edge, 0 μsec Delay

           f. Configure the RF Generator as follows:

           Amplitude Offset:      Calibrate the cable and directional coupler then enter the actual value.

           Frequency:             DME Receiver Fo +900 kHz (1077 MHz + 900 kHz)
           Amplitude:             -12 dBm(Maximum available from RF Gen)
           Ampl, ALC:             OFF
           Pulse:                 ON
           Pulse Source:          Ext2 DC
           AM:                    OFF
           MOD:                   ON
           RF:                    ON


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          LF out:                 ON
          LF Out Amp:             2Vp
          LF Out Source           Function Generator
          LF Out Waveform:        Square
          LF Out Freq:            1.001 kHz (small offset eliminates beat freq with monitor)

          g. Turn off the RF Generator to record the reference sensitivity._________

          h. Using PMDT, bypass the monitor.

          i. Connect the frequency counter to the Transmitter detected output pulse and and record the
          reading___________
          On the PMDT, if available, check the receiver sensitivity. Record the reference Receiver
          Sensitivity__________
          Screen Capture File ____________

          j. Turn on the RF Generator. Wait for a complete set of new data to be collected.

          l. Record the Receiver Sensitivity with +900 kHz adjacent channel interrogations.

          k. Set the RF Generator to Rx Fo – 900 kHz (1077 MHz -900 kHz). Wait for a complete set
          of new data to be collected. ____________

          l. Record the Receiver Sensitivity with -900 kHz adjacent channel interrogations.________

          m. Return the DME to normal operation.


3.5.2.2.6.1.4 Desensitization by Continuous Wave (CW)

          a. Confirm the DME is in NORMAL operation.

          b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
          dBm.

          c. Connect the oscilloscope CH1 to the Transmitter detected output pulse, test point XX,
          CH2 to the receiver Log Video, test point XX, and trigger off the appropriate test point, XX.

          d. Using PMDT bypass the Monitor.

          e. Using the appropriate test equipment, set the interrogation signal level to -94 dBm.

          f. In the PMDT, if the executive monitor screen is available, verify the efficiency is ≥70.
          _____. If the PMDT measurement is not available, connect a frequency counter to the
          appropriate test point XX.



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           g. Using the oscilloscope record the level of the noise floor. ___________

           h. Set the interrogation level to -92 dBm and set the CW to -10 dB below the interrogation
           level.

           i. Using the PMDT, or frequency counter, verify the transmission rate is ≥70.________

           k. Using the oscilloscope record the level of the noise floor._________

           l. Set the Interrogation Level to -50.0 dBm.

           m. Using the PMDT, or counter verify the transmission rate is ≥70.

           n. Using the oscilloscope record the level of the noise floor. _________

           o. Set the Interrogation Level to -10.0 dBm.

           p. Using the PMDT, or counter verify the transmission rate is ≥70.

           q. Using the oscilloscope record the level of the noise floor.___________.

           r. Set the Interrogation Level to -70.0 dBm and set the CW level to -6.0 dB.

           s. Using the PMDT, or counter verify the transmission rate is ≥70.

           t. Using the oscilloscope record the level of the noise floor. __________

           u. Set the Interrogation Level to -20.0 dBm.

           v. Using the PMDT, or counter verify the transmission rate is ≥70.

           w. Using the oscilloscope record the level of the noise floor.________.

           x. Return the DME to NORMAL operation.


3.5.2.2.6.1.5 Desensitization by High Repetition Rate/High Duty Cycle Pulse Signals.

           a. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
           dBm.

           b. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
           Equipment. The trigger for the Arbitrary Generator should be hooked to LF Out on the RF
           Generator. The oscilloscope is not needed.

           c. Configure the Arbitrary Generator as follows:



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         Channel 1:             ON
         Function:              Square
         Frequency:             37 kHz
         High Level:            2V
         Low Level:             0V
         Run Mode:              Continuous

         Channel 2:             ON
         Function:              Pulse
         Period:                12 μs
         High Level:            2V
         Low Level:             0V
         Width:                 8 μs
         Run Mode:              Burst, 1 Cycles
         Trigger:               External Source, Negative Edge, 0 μsec Delay (hooked to CH1)

         d. Configure the RF Generator as follows:

         Amplitude Offset:      Calibrate the cable and directional coupler then enter the actual value.

         Frequency:             DME Receiver Fo (1077 MHz)
         Amplitude:             -104 dBm(-94 dBm -10 dB)
         Ampl, ALC:             OFF
         Pulse:                 ON
         Pulse Source:          Ext2 DC
         AM:                    OFF
         MOD:                   ON
         RF:                    ON


         e. Turn off the RF Generator to record the reference sensitivity. ________

         f. Using PMDT, put the DME system in Local Control, bypass or maintenance mode.

         g. In the PMDT, if available check the receiver sensitivity. A counter can also be connected
         to the transmitter detected output pulse. Record the reference Receiver
         Sensitivity__________
         Screen Capture File ____________

         h. Turn on the RF Generator. Wait for a complete set of new data to be collected.


         i. Record the Receiver Sensitivity with high repetition rate . Verify the change is ≤0.5 dB.

         j. On the DME system, transponder setting turn OFF the squitter (disable the squitter if
         available).



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            k. On the PMDT, or counter verify the transmission rate is <60.

            n. Return the DME to NORMAL operation.


3.5.2.2.6.2 Sensitivity to Adjacent Channel Interrogations.

            a. Refer back to the procedure in 3.5.2.2.6.1.3h-k.

            b. Verify the efficiency tests for -900 kHz at -10 dBm less than 5%._______

            c. Verify the efficiency tests for +900 kHz at -10 dBm less than 5%. _______

            d. These tests verify the system meets the requirements in FAA-E-2996.


3.5.2.2.6.3 Dynamic Range – To test this we will verify the reply efficiency remains over 70% at the
extremes of the required range and at two other levels that can be selected during the test. Performance
at the smallest signal level was checked in the receiver sensitivity. Performance at the maximum level
will be checked below.

            a. Confirm the DME is in NORMAL operation.

            b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
            dBm.

            c. Log ON to the PMDT. Place the DME system in Local control, bypass or maintenance
            mode.

            d. Set up the appropriate test equipment with the required interrogation level.

            f. Record the Reply Efficiency reading with interrogation level of -10 dBm______%.
            LIMIT: 70% Min.

            g. Change the Level to -50 dBm.

            h. Record the Reply Efficiency reading with interrogation level of -50 dBm_____%.
            LIMIT: 70% Min.

            i. Change the Level in the to -60 dBm.

            j. Record the Reply Efficiency reading with interrogation level of -60 dBm_____%.
            LIMIT: 70% Min.

            k. Change the Level -79 dBm.

            l. Record the Reply Efficiency reading with interrogation level of -79 dBm_____%.


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             LIMIT: 70% Min.

             m. Return the DME to NORMAL operation.


3.5.2.2.6.4 Noise Generated Pulse Pairs.

             a. Confirm the DME is in NORMAL operation.

             b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             c. Using the PMDT, put the DME in Local Control, bypass or maintenance mode.

             d. Set up the test equipment as required in FAA-E-2996. Disable the squitter if the
             function is available in the DME system.

             g. Connect a counter to the detected output test point XX in the transmitter module and
             record the reading. ___________.

             h. Calculate the reply efficiency as the Number of replies/6953.

             i. Calculate the noise pulses per the formula (from ED-57 figure 4-2):

             Noise rate = TX rate/Reply Efficiency - 6953

             j. Verify the noise is less than 270 (5400*0.05)

             k. To demonstrate the actual number of noise generated replies with no interrogations, se the
             repetition rate value to 0.

             l. Verify that with no interrogations that the transmission rate is ≤5.

             m. Return the DME to NORMAL operation.


3.5.2.2.7    Reply Efficiency.

             a. Confirm the DME is in NORMAL operation.

             b. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             c. Using PMDT, put the DME system in Local Control, bypass or maintenance mode.




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           d. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
           Equipment. The trigger for the Arbitrary Generator should be hooked to CH1 of the
           Arbitrary Generator.

           e. Configure the Arbitrary Generator as follows:

           Channel 1:             ON
           Function:              Square
           Frequency:             1 kHz
           High Level:            2V
           Low Level:             0V
           Run Mode:              Continuous

           Channel 2:             ON
           Function:              Pulse
           Period:                12 μsec
           High Level:            2V
           Low Level:             0V
           Width:                 3.5 μsec
           Run Mode:              Burst, 2 Cycles
           Trigger:               External Source, Negative Edge, 0 μs Delay (hooked to CH1)

           f. Configure the RF Generator as follows:

           Amplitude Offset:      Calibrate the cable and directional coupler then enter the actual value.


           Frequency:             DME Receiver Fo (1077 MHz)
           Amplitude:             -94 dBm
           Ampl, ALC:             OFF
           Pulse:                 ON
           Pulse Source:          Ext2 DC
           AM:                    OFF
           MOD:                   ON
           RF:                    ON

           e. Turn OFF the Ident. (In some DME equipment when the monitor is bypassed, i.e., Local
           Control, bypass, or maintenance mode, the IDENT is OFF).

           f. Using the table below record the transmission rate from the PMDT executive monitor for
           all external Transmission Rates.

                               External Interrogation Level: -94 dBm
       External Rate (Hz)              TX Transmission Rate                      % Efficiency
1000



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1500
2000
2500
3000
3500
4000
4500
5000

             g. Verify that the DME replies are ≥70% at each level of transmitter loading. Note: the
             nominal value of 50 single-monitor interrogations should be subtracted from the TX
             transmission rate readings prior to calculating efficiency.

             h. Return the DME to normal operation.


3.5.2.2.8    Interference Suppression.

             a. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             b. Tune the receiver to 1088 MHz by setting the channel to 64X.

             c. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
             Equipment. The trigger for the Arbitrary Generator should be hooked to CH1 of the
             Arbitrary Generator. The oscilloscope is not needed.

             d. Configure the Arbitrary Generator as follows:

             Channel 1:             ON
             Function:              Square
             Frequency:             1 kHz
             High Level:            2V
             Low Level:             0V
             Run Mode:              Continuous

             Channel 2:             ON
             Function:              Pulse
             Period:                12 μsec
             High Level:            2V
             Low Level:             0V
             Width:                 3.5 μsec
             Run Mode:              Burst, 2 Cycles
             Trigger:               External Source, Negative Edge, 0 μs Delay (hooked to CH1)

             e. Configure the RF Generator as follows:



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           Amplitude Offset:        Calibrate the cable and directional coupler then enter the actual value.

           Frequency:               10.7 MHz (need to check the receiver block diagram)
           Amplitude:               -14 dBm (-94 dBm + 80 dB)
           Ampl, ALC:               OFF
           Pulse:                   ON
           Pulse Source:            Ext2 DC
           AM:                      OFF
           MOD:                     ON
           RF:                      ON

           f. Turn off the RF Generator for a reference Transmission Rate reading.

           g. Put the DME in Local Control, Bypass or Maintenance Mode to bypass the Monitor.

           i. Disable squitter (if possible).

           j.. On the PMDT executive monitor verify the Transmission Rate is <60

           k. Turn on the RF Generator.

           l. For all of the frequency listed in the table below, record the Transmission Rate. For range
           use 1 MHz steps and record the maximum Transmission Rate.

   Test Freq (MHz)               Description            RF Generator Power         TX Transmission Rate
                                                              (dBm)
10.7 (need to check RX     IF                                    -14
block diagram)
63 (need to check Rx       IF                                    -14
black diagram)
838                        Spur                                  -19
963                        Spur                                  -19
984.4                      Spur                                  -19
1191.6                     Spur                                  -19
962-1087                   Low Band                              -19
1088                       Rx Frequency                          -19
1089-1215                  High Band                             -19

           m. Verify that all the transmission Rate is <60 for all measurements in the table except for
           the 1088 reference reading.

           n. Return the DME to NORMAL operation.




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3.5.2.2.9    Random Squitter Pulses.

             a. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             b. Put the DME in Maintenance Mode to bypass the monitor.

             c. In the PMDT, confirm the squitter rate is enabled and the Minimum Squitter is 800.

             d. Set up the test equipment as required in FAA-E-2996.

             e. Connect a frequency counter to transmitter detected output pulse, test point XX and verify
             the number of Total Replies are zero. _______

             f. Using the PMDT executive monitor screen, record at least 10 transmission rate readings.

             g. Verify that the average Transmission Rate is 800±25 and that the maximum transmission
             rate does not exceed 850.

             h. Return the DME to NORMAL operation.


3.5.2.2.9.1 Effect of Traffic Loading.

             a. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
             dBm.

             b. Put the DME system in Local Control, bypass or maintenance mode to bypass the
             monitor.

             c. In the PMDT, confirm the squitter rate is enabled and the Minimum Squitter is 800.

             d. Set up the test equipment as required in FAA-E-29996.

             e. Connect a frequency counter to transmitter detected output pulse, test point XX and record
             the average transmission rate using the following table. Change the transmission rate to
             match the monitor repetition rate.

             f. Using the PMDT executive monitor screen, record at least 10 transmission rate readings.


   Monitor           Decodes (N)          TX           Squitter            Min. Allow      Max Allow
Interrogations                        Transmission     (Transmission        (700-N)        (850-N)
                                          Rate         Rate-N)
100
200



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300
400
500
600
700
800
850

          g. After collecting the decodes, calculate the minimum and maximum allowable range using
          the formulas in the table.

          h Verify that the number of squitter pulses is within the allowable range specified in the
          table.

          i. Return the DME to NORMAL operation.


3.5.2.2.10 Automatic Gain Reduction (AGR)

          a. Log ON to the PMDT. Ensure the DME is in X channel with a sensitivity setting of -94
          dBm. Put the DME in Maintenance Mode to bypass the monitor.

          b. Connect the test equipment to the DME as shown in Figure 4, Receiver External Test
          Equipment. The trigger for the Arbitrary Generator should be hooked to LF Out on the RF
          Generator. The oscilloscope is not needed.

          c. Configure the Arbitrary Generator as follows:

          Channel 1:              ON (used to spread interrogation level)
          Function:               Ramp
          Frequency:              987 Hz
          Amplitude:              750 mVpp
          Offset:                 0 mV
          Symmetry                50.0%
          Run Mode:               Continuous

          Channel 2:              ON
          Function:               Pulse
          Period:                 12 μs
          High Level:             2V
          Low Level:              0V
          Width:                  3.5 μs
          Run Mode:               Burst, 2 Cycles
          Trigger:                External Source, Negative Edge, 0 μsec Delay (Trigger hook to LF
                                  Out)




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           d. Configure the RF Generator as follows:

           Amplitude Offset:       Calibrate the cable and directional coupler then enter the actual value.

           Frequency:              DME Receiver Fo (1077 MHz)
           Amplitude:              -12 dBm(Maximum available from RF Gen)
           Ampl, ALC:              OFF
           Pulse:                  ON
           Pulse Source:           Ext2 DC
           AM, AM path:            WB (wideband)
           AM, AM:                 ON (wideband AM enabled)
           MOD:                    ON
           RF:                     ON

           LF out:                 ON
           LF Out Amp:             2Vp
           LF Out Source:          Function Generator
           LF Out Waveform:        Pulse
           LF Out Period:          168μs
           LF Out with:            40 μs

           e. Turn off the RF Generator to record the reference sensitivity.________

           f. Put the DME in Maintenance Mode to bypass the monitor.

           g. On the PMDT, check the reply efficiency. If measurement not available on the PMDT,
           connect a counter to the transmitter detected output pulse, test point XX. Record the
           reference Receiver Sensitivity__________.
           Screen Capture File ____________

           h. Turn on the RF generator.

           i. Wait for the transmission rate to settle then verify that it is above 4320 (4800*0.9).

           j. On the PMDT, check the reply efficiency. If measurement not available on the PMDT,
           connect a counter to the transmitter detected output pulse, test point XX. Record the
           reference Receiver Sensitivity__________.
           Screen Capture File ____________

           k. Verify that the change in receiver sensitivity was greater than 50 dB.
           Δ =___________

           l. Return the DME to NORMAL operation.


3.5.2.2.11 Priority of Transmission.



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         a. Log ON to the PMDT. Ensure the DME is in Y channel with a sensitivity setting of -94
         dBm. Put the DME in Local Control, bypass, or Maintenance Mode to bypass the monitor.

         b. Connect the test equipment to the DME as shown in Figure 3, Receiver External Test
         Equipment. The trigger for the Arbitrary Generator should be hooked to LF Out on the RF
         Generator. The oscilloscope is not needed.

         c. Configure the Arbitrary Generator as follows:

         Channel 1:             ON (used to spread interrogation level)
         Function:              Ramp
         Frequency:             987 Hz
         Amplitude:             750 mVpp
         Offset:                0 mV
         Symmetry               50.0%
         Run Mode:              Continuous

         Channel 2:             ON
         Function:              Pulse
         Period:                12 μs
         High Level:            2V
         Low Level:             0V
         Width:                 3.5 μs
         Run Mode:              Burst, 2 Cycles
         Trigger:               External Source, Negative Edge, 0 μsec Delay

         d. Configure the RF Generator as follows:

         Amplitude Offset:      Calibrate the cable and directional coupler then enter the actual value.

         Frequency:             DME Receiver Fo
         Amplitude:             -50 dBm
         Ampl, ALC:             OFF
         Pulse:                 ON
         Pulse Source:          Ext2 DC
         AM, AM path:           WB (wideband)
         AM, AM:                ON (wideband AM enabled)
         MOD:                   ON
         RF:                    ON

         LF out:                ON
         LF Out Amp:            2Vp
         LF Out Source:         Function Generator
         LF Out Waveform:       Pulse
         LF Out Period:         200μs
         LF Out with:           40 μs



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           e. On the PMDT, from the DME system transponder setting, select a continuous Ident.

           f. On the PMDT verify the transmission rate is 2700±10.
           Total number of replies________(using the counter or PMDT)

           g. On the PMDT, from the transmitter setting, select Ident OFF.

           h. On the ePMDT verify the transmission rate is ≥4320 (4800*0.9).
           Total number of replies__________

           i. Turn OFF the RF generator.

           j. On the PMDT verify the transmission rate is 800±25.
           Total number of replies__________

           k. In the Transmitter Setting, select Continuous Ident.

           l. On the executive monitor record the transmission rate and verify the transmission rate is
           2700±10.
           Total number of replies__________

           m. Return the DME to NORMAL operation.


3.5.2.3    Identification Signals and Keying

           a. Connect the frequency counter to the appropriate test point XX (see Figure 6, provide
           module with Ident test point).

           b. Set the frequency counter to measure frequency rate.

           c. Confirm the DME is operational and identification set to continuous ident.

           d. Take the measurement from the frequency counter.

           Repetition Rate                                                                 _____Hz
           LIMIT: 1347.3 to 1352.7 Hz




                              Figure 6, Module with IDENT test point

           e. Return the DME to NORMAL operation




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3.5.2.3.1 Identification Keying Control
Test the system to show identification can be controlled from an external source such as an ILS (real or
simulated).

            a. Refer to appropriate section of the MIB, connect the ILS identification signal to the
            appropriate test points.

            b. Confirm DME is set to trigger off an external source for identification.

            c. Verify the DME is in NORMAL operation.

            d. Turn ON the ILS identification signal (or simulated ILS signal). The DME should be ON.

            e. Turn OFF the ILS identification signal (or simulated ILS signal). The DME should be
            OFF.

            f. Is the Interlock Operation correct?                   _______YES/NO

            g. Turn ON the ILS identification signal (or simulated ILS signal). The DME should be ON.
            Disconnect the antenna return cable, and reconnect the return cable. This action will simulate
            a fault during start up.

            h. Does the DME re-start function operates correctly?      _________YES/NO.

            i. Verify the test meet the requirement in FAA-E-2996.

            j. Return the DME to NORMAL operation.


3.5.2.3.2 Identity Keying Control
Manual control shall be provided on each transponder to enable (1) normal identification keying, (2)
removal of identification keying, and (3) continuous transmission of identification signal pulse groups.
The manual control shall be used to select each mode (1, 2, and 3) and appropriate operation of
identification keying control verified against each selected mode.

            a. Log on to the PMDT.

            b. Put the DME in Local Control, bypass or maintenance mode to bypass the monitor.

            c. In the DME system, transponder setting, ensure the First Identity Code is set for the
            facility IDENT CODE and the Dot Duration is set for 120 ms.

            d. From the Transponder settings, select the IDENT for normal identification keying (1).

            e. Verified the DME Identification is keyed and matches the Transmitter Settings.

            f. From the Transmitter settings, select the IDENT for Continuous identification keying (2).


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             g. Verified the DME Identification is keyed and matches the Transmitter Settings.

             h. From the Transmitter settings, turn OFF the Ident (3).

             i. Verify the DME identification is OFF.

             j. Verify the DME meets the requirements in FAA-E-2996 paragraph 3.2.3.2.

             g. Return the DME to NORMAL operation.


3.5.2.3.3    independent Identification Signal Characteristics.

             a. Confirm the DME is in NORMAL operation.

             b. Connect the scope probe to the appropriate test point XX (see Figure 6, manufacturer need
             to provide module with Ident test point).

             c. Set the scope to 2 Volts.DIV, 100ms/DIV, Trigger from CH1 and Positive slope.

             d. Wait for the scope to capture a dot and dash on the same screen.

            e. Measure and record the duration of a Dot, Dash, Space and the Interval below. Ident is
only transmitted every 32 seconds, so it might take as long as ½ a minute for the ident trace to appear on
the scope.


             Dot Duration                                                                  ______ms
             LIMIT: 100 to 160 ms

             Space Duration                                                                ______ms
             LIMIT: 100 to 160 ms

             Dash Duration                                                                 ______ms
             LIMIT: 300 to 480 ms

             Interval (time between letters)                                               ______ms
             LIMIT: 300 to 480 ms

             f. In the PMDT, change the IDENT to IYYY.

             m. Calculate the worst case max time of the longest long ident code string.
             IYYY = ____________
             Measured Value___________
             Screen Capture TEK________.png



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3.5.2.3.4    Associated Identification Signal Characteristics

             a. Log on to the PMDT.

             b. Put the DME in Local Control, bypass or maintenance mode to bypass the monitor.

             c. In the DME system, transponder settings, ensure the First Identity Code is set for the
             facility IDENT CODE and the Dot Duration is set for 120 ms.

             d. Refer to appropriate Section of the MIB, connect the external test equipment with ident
             trigger to the DME every 32 seconds. This will simulate an ident period of the Mark-20 ILS.

             e. In the PMDT, select the setting to accept Ident Code of a Keyer.

             f. Connect Channel 2 of oscilloscope to appropriate test point, XX (Detected Ident). Observe
             the Ident is activated approximately once every 32 seconds.
             Is the Ident present every 32 seconds                      _________YES/NO.

             g. Set the scope for 10s/division and set the scope for continuous acquisition with auto
             trigger.

             h. Record at least two ident cycle in the scope.

          i. Measure the time between the start of the two Ident Cycles.
Observe that the Indent is activated approximately once every 32 seconds. Ident occurs
approximately once every 32 sec. _____s (YES/NO).
Screen Capture file_____________

             j. Disconnect the external test equipment from the DME.

             k. Return the DME to Normal operation.


3.5.2.3.5    Identification Implementation.

Confirm that the verification procedures 3.5.2.3.1, 3.5.2.3.2, 3.5.2.3.3, and 3.5.2.3.4 meet the requirement
FAA-E-2996.


3.5.2.4      Transmitter and Associated Circuitry


3.5.2.4.1a Tuning of Spurious Output
The test procedure shall be checked during the RF Pulse Signal Spectrum, paragraph 3.5.2.6.7.

Screen Capture file_____________


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From the Screen Capture file, verity that the DME meets the requirement FAA-E-2996.


3.5.2.4.1a Tuning of Spurious Output

           a. Connect the biconical antenna, Emco 3102 to the spectrum analyzer. Place the antenna
           approximately one meter from the cabinet and parallel to the side being tested.

           b. Set the DME for its maximum transmission rate, record the maximum stray radiation level
           emitting from the cabinet. ____________dBm

           c. Move the antenna around the circumference of the cabinet, using both vertical and
           horizontal polarization and record the highest stray radiation level emitting from the
           cabinet._____________

           d. Repeat steps b and c with the cabinet doors opened. Record the highest radiation level
           and verity that the DME meets the requirement FAA-E-2996.
           ________________-79 dBm Maximum

           f. Repeat steps b, c, and d for 1X, 63X, 1Y, 63Y and 126X.

           g. Repeat steps a through f using the biconical antenna, Emco 3103.
           h. Return the DME to NORMAL operation.


3.5.2.4.2a Power Output – Record the output power from the peak power meter

           a. Connect the power peak meter with the appropriate attenuator to the output of the
           transponder as indicated in Figure 7, Peak Power Measurement on Antenna (provide a figure
           showing this measurement).

           b. Measure the DME output power by reading the peak power meter.
           Output Power for Low Power DME _______ Watts
           LIMIT: 100 Watts Min., 125 Watts Max., for Low Power DME.


           Output Power for High Power DME _______ Watts
           LIMIT: 1000 Watts Min., 1250 Watts Max., for High Power DME.




                          Figure 7. Peak Power Measurement on Antenna




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3.5.2.4.2b RF Output Power Control.

            a. Connect the power peak meter with the appropriate attenuator to the output of the
            transponder as directed in Figure 7.

            b. The initial power reading will be made a 1000 W. Record the setting in the Executive
            Monitor on antenna.
            Power Measurement in the screen _____________Watts

            c. With 0 dB reduced power the meter reads ________W (1000 Watts)

            d. The output power of the transponder will then be adjusted by 1 dB below (90%) initial
            setting of the Transmitter Power in step b. Turn the transmitter OFF and ON. Take the
            measurement from the Power Meter.

            1 dB reduced power: _______W (Initial measurement – 1dB).

            e. Reduced the transmitter power setting by 2 dB and take the measurement at the power
            peak meter.

            2 dB reduced power: _________W (Initial measurement – 2 dB)

            f. Reduced the transmitter power setting by 3 dB and take the measurement at the power
            peak meter.

            3 dB reduced power: _________W (Initial measurement – 3 dB)

            g. Reduced the transmitter power setting by 4 dB and take the measurement at the power
            peak meter.

            4 dB reduced power: _________W (Initial measurement – 4 dB)

The power reading made should be compared to the initial reading to confirm a change less than ±-0.25
dB.


3.5.2.4.2c Output Power Control
Means shall be provided to permit continuous adjustment of the RF output power in 0.25 dB steps.

Screen Capture the Transmitter Settings, power adjustment screen.


3.5.2.4.3 Reply Delay Adjustment.
Verify the transponder reply delay can be adjusted. This can be validated using an oscilloscope and the
systems instruction manual to determine the correct test point to monitor.




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         a. Connect the oscilloscope CH1 to the detected monitor interrogation test point XX (refer to
         the Module provide by the Vendor in figure 8). Connect CH2 to the transmitter detected
         output pulse test point XX (refer to the HPDNE OR LPDME module figure 2 provided by the
         manufacturer. Ttrigger the oscilloscope from the appropriate test point XX.

         b. Log ON to the PMDT. Put the DME system in Local Control, bypass or maintenance
         mode to bypass the monitor.

         c. Confirm the DME is operational. Confirm the DME is set to X Channel.

         d. Using the PMDT and appropriate test signal as required by FAA-e-299.

         e. Set the oscilloscope time base to 10 or 20 μsec.

         f. Measure the time from the 50 percent point of the rising edge of the first constituent pulse
         of the pulse pair on CH1 to the 50 percent point of the leading edge of the first constituent
         pulse of the pulse pair on CH2.

         g. Record the measured value in the scope      ___________ μsec .
         Verify the Reply Delay is 50 μsec.
         Screen Capture File___________

         h. Record the Reply Delay measurement in the Monitor screen.
         Reply Delay in the PMDT ___________ μsec
         LIMIT: 49.8 to 50.2 μsec.

         i. .Using the PMDT change the Reply Delay to 35 μsec.

         j. Record the measured value in the scope___________μsec .
         Verify the Reply Delay is 35 μsec.
         Screen Capture File___________

         k. Record the Reply Delay measurement in the Monitor screen.
         Reply delay in the PMDT Monitor ___________ μsec
         LIMIT: 34.8 to 35.2 μsec.

         p. Using the PMDT change the Reply Delay to 42 μsec.

         q. Record the measured value in the scope___________μsec .
         Verify the Reply Delay is 42 μsec.
         Screen Capture File___________

         r. Record the Reply Delay measurement in the Monitor screen.
         Reply delay in the PMDT Monitor ___________ μsec
         LIMIT: 41.8 to 42.2 μsec.

         s. Using the PMDT change the Reply Delay to 65 μsec.


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          t. Record the measured value in the scope ___________ μsec .
          Verify the Reply Delay is 65 μsec.
          Screen Capture File___________

          u. Record the Reply Delay measurement in the Monitor screen.
          Reply delay in the PMDT Monitor ___________ μsec
          LIMIT: 64.8 to 65.2 μsec.

          v. Reconfigure the DME for Y Channel

          w. .Verify the DME system is in Local Control, bypass or in maintenance mode. Using the
          PMDT change the Reply Delay to 56 μsec.

          x. Record the measured value in the scope ___________ μsec .
          Verify the Reply Delay is 56 μsec.
          Screen Capture File___________

          y. Record the Reply Delay measurement in the Monitor screen.
          Reply delay in the PMDT Monitor ___________ μsec
          LIMIT: 55.8 to 56.2 μsec.

          z. Using the PMDT change the Reply Delay to 50 μsec.

          aa. Record the measured value in the scope ___________ μsec .
          Verify the Reply Delay is 50 μsec.
          Screen Capture File___________

          ab. Record the Reply Delay measurement in the Monitor screen.
          Reply delay in the PMDT Monitor ___________ μsec
          LIMIT: 49.8 to 52.2 μsec.

          ac. Using the PMDT change the Reply Delay to 62 μsec.

          ad. Record the measured value in the scope ___________ μsec .
          Verify the Reply Delay is 62 μsec.
          Screen Capture File___________

          ae. Record the Reply Delay measurement in the Monitor screen.
          Reply delay in the PMDT Monitor ___________ μsec
          LIMIT: 61.8 to 62.2 μsec.

Use the recorded measurements to verify that the DME meets the requirement FAA-E-2996.




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                                    Figure 8. Module with Detected Interrogation Pulse

3.5.2.4.4    Accuracy.

             a. Log ON to the PMDT. Put the DME system in Local Control, bypass, or maintenance
             mode to bypass the monitor.

             b. Confirm the DME is operational. Confirm the DME is set to X Channel. Ensure the
             DME is in X channel with a sensitivity setting of -94 dBm.

             c. Connect the test equipment to the DME as shown in figure 9, Delay Measurement Test Set
             up.

                                                                                                                    40dB


                                                      +5V
                                     Power                       DME
                                                      Gnd                                Variable
                                     Supply                     Detector
                                                      -5V                               Attenuator




                                                                                                                 20dB
                                                                              +12dBm
                                                                               peak                  ~2dB loss

                                      Arb Generator
                                      Tek AFG3252
                                                                             Splitter




                                                                                        6dB loss
                                        1 out 2 out    Trig
                                                                                          min

                                                                                                            DME
                                    RF Generator        Ext2
                                I                       input
                                    HP E4432B          LF out
                                                                                                            RCVR Mon1
                                                       RF out
                                                                                                       XX


                                                                                                                        Video
                  Detected
               Interrogations          Oscilloscope
                                           CH1 CH3   Aux
                                             CH2 CH4                                                                     XX

                                                                           Detected
                                                                           Replies




                                                  Figure 9. Delay Measurement Test Set up.


             d. Configure the Arbitrary Generator as follows:



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         Channel 1:             ON (used for trapezoidal pulse generation)
         Function:              Pulse
         Period:                12μs
         Delay:                 0μs
         High:                  0V
         Low:                   -500mV
         Width:                 3.28μs
         Leading Edge:          2.53μs
         Trailing Edge          2.59μs
         Run Mode:              Burst, 2 Cycles
         Trigger:               External Source, Negative Edge, 47.4μs


         Channel 2:             ON (Pulse modulates the generator between interrogations)
         Function:              Pulse
         Period:                25 μs
         Delay:                 0 μs
         Amplitude:             2Vpp
         Offset:                0V
         Duty                   99.9%
         Leading Edge:          2.5ns
         Trailing Edge:         2.5ns
         Run Mode:              Burst, 1 Cycle
         Trigger:               External Source, Negative Edge, 44 μsec Delay

         e. Configure the RF Generator as follows:

         Amplitude Offset:     0 dB
         Frequency:            DME Receiver Fo
         Amplitude:        18 dBm(Note: this level was shown to give +12 dBm into the variable
                           attenuator: with the attenuator at 6 dB the receiver sees -16 dBm using
                           the 20 dB coupler)

         Ampl, ALC:             OFF
         Pulse:                 ON
         Pulse Source:          Ext2 DC
         AM, AM path:           WB (wideband)OFF
         AM, AM:                ON (wideband AM enabled)
         MOD:                   ON
         RF:                    ON

         LF out:                ON
         LF Out Amp:            2Vp
         LF Out Source:         Function Generator
         LF Out Waveform:       Pulse
         LF Out Period:         7 ms (143 Hz)


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           LF Out with:            28 ms

           f. Configure the oscilloscope as follows:

           CH1:                    OFF
           CH2:                    1V/div
           CH3:                    0.5V/div
           CH4                     1V/div
           Timebase:               10μsec/div
           Trigger                 Aux, edge, TTL Level

           g. Set the variable attenuator to 50 to achieve a receiver power of -60 dBm.

           h. Using the PMDT and appropriate test equipment set the correct level and frequency as
           required in FAA-E-2996.

           j. At the oscilloscope, turn on measurement statistics (if available) with at least 100 readings
           averaged.

           k. Using the oscilloscope measurements verify that the detected interrogations have a rise
           and fall time of 2.4±0.5μs and a width of 3.5±0.5μs. Adjust CH1 of the Arbitrary Generator
           if necessary. Also verify that the initial delay from the leading edge of the first interrogations
           pulse to the leading edge of the first reply pulse is 50±0.5μs.

           l. Set the variable attenuator to 84 to achieve a receiver power of -94 dBm.

           m. For all of the entries in the following table, record the mean delay and the standard
           deviation o f the delay reading.


 RF Power          Variable Attenuator               Average Delay (μsec)              Delay Standard
  (dBm)                  Setting                                                       Deviation (nsec)
    -20                       10
    -30                       20
    -40                       30
    -50                       40
    -60                       50
    -70                       60
    -80                       70
    -90                       80
    -94                       84

           o. For all readings verify that the delay is 50±0.5μs and the standard deviation is ≤0.5μs.

           p. Return the DME to NORMAL operation.



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3.5.2.5      Power Delay Control and Adjustment


3.5.2.5.1    Local High Voltage Control.

Test Objective(s): The objective of this test is to verify the requirements of the DME local high voltage
control.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: None.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.2.5.1.

Procedures:

The equipment manufacturer shall demonstrate a mean by which the high voltage power can be turned
off. This can be manual switch or located in the system interface.

functionality of the equipment to verify the requirements from the DME specification.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.2.5.2    Operation of Overload Protective Devices.

             a. Connect a PMDT to the DME.

             b. Confirm the DME is in NORMAL operation.



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             c. Log ON with the PMDT to DME.

             d. Reset the DME equipment.

             e. Verify all LEDS on DME modules are operating correctly.

             f. Verify the system restarts and proceeds to an operational mode.

             g. Use the inspection to the system to verify the requirements in FAA-E-2996.


3.5.2.6      Transponder Output Signals


3.5.2.6.1    Pulse Shape

Use an oscilloscope to measure and record the transmitter pulse characteristics.

             a. Log ON to the PMDT. Put the DME system in Local Control, bypass or maintenance
             mode to bypass the monitor.

             b. Confirm the DME is operational. Confirm the DME is set to X Channel with a sensitivity
             setting of -94 dBm.

             c. Connect the oscilloscope CH1 to the detected output pulse in the transmitter test point XX
             See Figure 2, HPDME and LPDME Module. Trigger the Scope from appropriate test point
             XX.

             d. Using the PMDT and appropriate test equipment, set the level and frequency as required
             by FAA-E-2996.

             e. Set the sweep time to 1 or 2μs/division. You may need to trigger of the channel 1 signal.
             Screen Capture file in X-Channel_____________
             Screen Capture file in Y-Channel_____________

The oscilloscope will be used to measure the pulse shape characteristics in the following paragraph
3.5.2.6.1.1 through 3.5.2.6.1.5.

3.5.2.6.1.1 Rise Time

             a. Confirm the DME is operational.

             b. Measure the rise time of the first pulse from 10% to 90% point on rising edge
             Measured rise time ______μsec
             LIMIT: 3 μsec Max.;




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3.5.2.6.1.2 Pulse Top

           a. Measure the instantaneous amplitude of the pulse shape which shall not, at any instant
           between the point of the leading edge which is 95% of maximum amplitude and the point of
           the trailing edge which is 95% of the maximum amplitude, fall below a value which is 95%
           of the maximum voltage amplitude of the pulse.

           b. Verify the pulse remains at or above 95% between the 95% point of the leading edge and
           95% of the trailing edge _______(YES/NO).


3.5.2.6.1.3 Duration (Pulse width)

           Measure the duration of the pulse (measure the pulse duration from the 50 percent point of
           the rising edge to the to 50 percent point of the falling edge).
           Measured pulse width ______ μsec
           LIMIT: 3.0 to 4.0 μsec


3.5.2.6.1.4 Decay Time (Fall Time)

           Measure the decay time of the pulse (measure the decay time from the 90 percent point to 10
           percent point of the falling edge).
           Measured fall time _________ μsec
           LIMIT: 3.5 μsec Max.;


3.5.2.6.1.5 Instantaneous Magnitude

           a. Adjust the oscilloscope to obtain the best view of the virtual origin. See figure 10, Virtual
           Origin below.

           b. Find the virtual origin on the horizontal axis of the scope. Find the initial turn on point of
           the pulse on the horizontal axis. The initial turn on point is where the scope trace leaves the
           horizontal and starts to form the pulse.

           c. Measure and record the time ___________ μsec
           LIMIT: 1 μsec Max.

           d. Examine the leading edge of the pulse, starting with the initial turn on and ending with the
           30 percent point.

           e. Verify there are no turn on transients that exceed 1 percent of the peak pulse value.
           Transients Prior To Virtual Origin                               _______ 0 % Of peak
           LIMIT: 1% MAX




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                                       Figure 10. Virtual Origin

             f. Return the DME to NORMAL operation.

3.5.2.6.2    Pulse Coding (Pulse Spacing)

             a. Log ON to the PMDT. Put the DME system in Local Control, bypass, or maintenance
             mode to bypass the monitor.

             b. Confirm the DME is operational. Confirm the DME is set to X channel with a sensitivity
             setting of -94 dBm.

             c. Connect the oscilloscope CH1 to the detected output pulse in the transmitter module test
             point XX, see figure 2, HPDME and LPDME Transmitter Module. Trigger the Scope from
             appropriate test point XX.



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             d. Using the PMDT and appropriate test equipment, set the level and frequency as required
             in FAA-E-2996.

             e. Set the scope time base to 10 to 20 μsec per division.

             f. Use the scope to measure the time between the 50% amplitude point of the leading edge on
             the first RF pulse and the 50% amplitude point of the leading edge of the second RF pulse.
             Measure pulse spacing________ μsec
             LIMIT: 11.6 to 12.4 μsec (X channel) or 29.5 to 31.5 μsec (Y channel)
             Screen Capture File TEK____.png


             g. Set the DME for Y channel operation. Confirm the DME is operational mode.
             Measure the pulse spacing________ μsec
             LIMIT: 29.5 to 31.5 μsec (Y channel)
             Screen Capture File TEK_____.png

             h. Return the DME to NORMAL operation.


3.5.2.6.3    RF Delay Time Variation

             a. Log ON to the PMDT. Put the DME system in Local Control, bypass or maintenance
             mode to bypass the monitor.

             b. Confirm the DME is operational. Confirm the DME is set to X channel with a sensitivity
             setting of -94 dBm.

             c. Connect the test equipment to the DME as shown in figure 9, Delay Measurement Test Set
             Up.

             d. Configure the Arbitrary Generator as follows:

             Channel 1:              ON (used for trapezoidal pulse generation)
             Function:               Pulse
             Period:                 12μs
             Delay:                  0μs
             High:                   0V
             Low:                    -500mV
             Width:                  3.28μs
             Leading Edge:           2.53μs
             Trailing Edge           2.59μs
             Run Mode:               Burst, 2 Cycles
             Trigger:                External Source, Negative Edge, 47.4μs


             Channel 2:              ON (Pulse modulates the generator between interrogations)


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         Function:              Pulse
         Period:                25 μs
         Delay:                 0 μs
         Amplitude:             2Vpp
         Offset:                0V
         Duty                   99.9%
         Leading Edge:          2.5ns
         Trailing Edge:         2.5ns
         Run Mode:              Burst, 1 Cycle
         Trigger:               External Source, Negative Edge, 44 μsec Delay

         e. Configure the RF Generator as follows:

         Amplitude Offset:     0 dB
         Frequency:            DME Receiver Fo
         Amplitude:        18 dBm(Note: this level was shown to give +12 dBm into the variable
                           attenuator: with the attenuator at 6 dB the receiver sees -16 dBm using
                           the 20 dB coupler)

         Ampl, ALC:             OFF
         Pulse:                 ON
         Pulse Source:          Ext2 DC
         AM, AM path:           WB (wideband)OFF
         AM, AM:                ON (wideband AM enabled)
         MOD:                   ON
         RF:                    ON

         LF out:                ON
         LF Out Amp:            2Vp
         LF Out Source:         Function Generator
         LF Out Waveform:       Pulse
         LF Out Period:         7 ms (143 Hz)
         LF Out with:           28 ms

         f. Configure the oscilloscope as follows:

         CH1:                   OFF
         CH2:                   1V/div
         CH3:                   0.5V/div
         CH4                    1V/div
         Timebase:              10μsec/div
         Trigger                Aux, edge, TTL Level

         g. Set the variable attenuator to 50 to achieve a receiver power of -60 dBm.

         h. In the PMDT disable squitter (if possible).



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         i. Using the oscilloscope measurements verify that the detected interrogations have a rise and
         fall time of 2.4±0.5μs and a width of 3.5±0.5μs. Adjust CH1 of the Arbitrary Generator if
         necessary. Also verify that the initial delay from the leading edge of the first interrogations
         pulse to the leading edge of the first reply pulse is 50±0.5μs.

         j. Record the delay at -60 dBm reference.

         k. Set variable attenuator to 84 to achieve a receiver power of -94 dBm.

         l. Verify the delay is within 0.5μs of the reference reading at -60 dBm.

         m. Set variable attenuator to 69 to achieve a receiver power of -79 dBm.

         n. Verify the delay is within 0.5μs of the reference reading at -60 dBm.

         o. Set variable attenuator to 77 to achieve a receiver power of -87 dBm.

         p. Verify the delay is within 0.5μs of the reference reading at -60 dBm.

         q. Refer to the Environmental Test Area section for testing of the delay over the range of
         service and conditions.

         r. Change the following parameters on CH1 of the Arbitrary Generator:

         Width:                  3.14 μs
         Leading Edge:           100ns
         Trailing Edge:          5ns

         s. Using the oscilloscope measurements verify that the detected interrogations have a rise and
         fall time of 0.1±0.1μs and a width of 3.5±0.5μs. Adjust CH1 of the Arbitrary Generator if
         necessary. Also verify that the initial delay from the leading edge of the first interrogations
         pulse to the leading edge of the first reply pulse is 50±0.5

         t. Set variable attenuator to 69 to achieve a receiver power of -79 dBm.

         u. Record -79 dBm reference.

         v. Set variable attenuator to 59 to achieve a receiver power of -69 dBm.

         w. Verify the delay is within 0.1μs of the reference reading at -79 dBm.

         x. Set variable attenuator to 49 to achieve a receiver power of -59 dBm.

         y. Verify the delay is within 0.1μs of the reference reading at -79 dBm.

         z. Set variable attenuator to 39 to achieve a receiver power of -49 dBm.



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            aa. Verify the delay is within 0.1μs of the reference reading at -79 dBm.

            ab. Set variable attenuator to 29 to achieve a receiver power of -39 dBm.

            ac. Verify the delay is within 0.1μs of the reference reading at -79 dBm.

            ad. Set variable attenuator to 19 to achieve a receiver power of -29 dBm.

            ae. Verify the delay is within 0.1μs of the reference reading at -79 dBm.

            af. Set variable attenuator to 9 to achieve a receiver power of -19 dBm

            ag. Verify the delay is within 0.1μs of the reference reading at -79 dBm.

            ah. Remove variable attenuator to achieve a receiver power of -10 dBm

            ai. Verify the delay is within 0.1μs of the reference reading at -79 dBm. Refer to the
            environmental Test Area for testing of the delay over the range of service conditions.

            aj. Set variable attenuator to 50 to achieve a receiver power of -60 dBm.

            ak. For all of the settings of desired rise time in the following table, adjust the rise, fall, and
            width parameters as needed to closely obtain the desired rise time and width of 3.5±0.5μs.
            Record the parameters and delay at each rise time listed.




Desired Rise      Set Rise Time       Set Fall Time         Set Width          Measured              Delay
   Time                                                                         Delay              Tolerance
   200ns                                                                                             Ref A
   400ns                                                                                            A±0.1μs
   600ns                                                                                            A±0.1μs
   800ns                                                                                            A±0.1μs
    1.0μs                                                                                            Ref B
    1.5μs                                                                                           B±0.5μs
    2.0μs                                                                                           B±0.5s
   2.25μs                                                                                           B±0.5μs
    2.5μs                                                                                           B±0.5μs
   2.75μs                                                                                           B±0.5μs
    3.0μs                                                                                           B±0.5μs

            al. Verify that all of the delay readings are within the tolerance listed.

            am. Change the following parameters on CH1 o f the Arbitrary Generator:



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             Width:                  3.14 μs
             Leading Edge:           100ns
             Trailing Edge:          5ns

             an. Using the oscilloscope measurements verify that the detected interrogations have a rise
             time of 0.1±0.1μs and a width of 3.5±0.5μs. Adjust CH1 of the Arbitrary Generator if
             necessary. Also verify that the initial delay from the leading edge of the first interrogations
             pulse to the leading edge of the first reply pulse is 50±0.5 μs.

             ao. Check to insure the LF Out Period on the RF Generator is still 7 ms (143Hz).

             ap. Record the 143Hz reference delay.

             aq. Change the LF Out Period on the RF Generator to 400 μs (2500Hz).

             ar. Verify the delay is within 0.1 μs of the reference reading at 143Hz.

             as. Change the LF Out Period on the RF Generator to 208 μs (4800Hz).

             at. Verify the delay is within 0.1 μs of the reference reading at 143Hz.

             au. Return the DME to NORMAL operation.


3.5.2.6.4    Transponder Power Output

             a. Remove power from the DME equipment. Connect the Peak Power Sensor with a 40 dB
             attenuator for High Power DME in line to the coupled port of the coupler, on the output of the
             transmitter cabinet. Refer to figure 7, Peak Power Measurement on Antenna.

             b. Set the peak power meter test frequency (for 53Y, Tx Freq is 1140 MHz) to the DME
             transmitter frequency under the Channel Setup screen. Verify Video B/W is OFF. Set video
             average to 64 (if using the Agilent N1911A).

             c. Turn ON power to the transponder.

             d. Position the cursors around the first TX pulse (using the Agilent N1911A peak power
             meter). Observe and record the peak meter reading.

             Output Power _______ Watts
             LIMIT: 1000 Watts Min., 1250 Watts Max., for High Power DME

             e. Return the DME to NORMAL operation.




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3.5.2.6.5    Pulse Power Variation

The following procedures will be conducted for the preset DME power of 1000 watts. The peak of the
constituent pulses of any pair of pulses shall not differ by more than 1 dB.

             a. Turn OFF the transmitter. Connect the Peak Power Sensor with a 40 dB attenuator in line
             to the coupled port of the coupler, on the output of the transmitter cabinet. Refer to figure 7,
             Peak Power Measurement on Antenna.

             b. Set the peak power meter test frequency (for 53Y, Tx Freq is 1140 MHz) to the DME
             transmitter frequency under the Channel Setup screen. Verify Video B/W is OFF. Set video
             average to 64.

             c. Turn ON transmitter.

             d. Position the cursors around the first TX pulse. Observe and record the peak meter
             reading.

             e. Position the cursors around the second TX pulse. Observe and record the peak meter
             reading.

             f. Calculate the pulse pair difference reading from values in Steps d and e.
             First pulse measurement _________dB, Second Pulse measurement _______dB
             Δ = ________dB
             LIMIT: Less than 0.5 dB

             g. Verify that the calculated difference meet the requirement in FAA-E-2996.


3.5.2.6.6    RF Pulse Signal Spectrum

The following procedures will be conducted for the preset DME power of 1000 watts. The spectrum of
the pulse modulated signal shall be such that during the pulse the effective radiated power contained in a
0.5 MHz centered frequencies 0.8 MHz above and 0.8 MHz below the nominal channel frequency in each
case shall not exceed 200 mW, and the effective radiated power contained in a 0.5 MHz band centered on
frequencies 2 MHz above and 2 MHz below the nominal channel frequency in each case shall not exceed
2 mW. The effective radiated power contained within any 0.5 MHz band shall decrease monotonically as
the band center frequency moves away from the nominal channel frequency.

             a. Log ON to the PMDT. Put the DME system in Local Control, bypass, or maintenance
             mode to bypass the monitor.

             b. Confirm the DME is operational. Confirm the DME is set to 53X with a sensitivity
             setting of -94 dBm.

             c. Connect the spectrum analyzer to the output of the system through 40 dB of attenuation.
             Add an additional 20 dB of attenuation at the spectrum analyzer input.


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             Refer to Figure 4, Test Equipment Set-Up for DME.

             d. Set up the spectrum analyzer on the center frequency o f the DME. Set span to 5 MHz,
             Resolution Bandwidth to 30 kHz, and video bandwidth to 100 kHz. Set the seep time to 5
             seconds. Set the spectrum analyzer detector to positive peak mode.

             e. Set the peak of the pulse to the reference (top) of the analyzer.

             f. Locate the frequency +800 kHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency.
             Screen Capture File_______________


             g. Locate the frequency -800 kHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency.
             Screen Capture File________________

             h. Set up the display line at -43 dB from the reference level.

             i. Remove the 20 dB attenuator.

             j. Locate the frequency +2 MHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency
             Screen Capture File_________________

             k. Locate the frequency -2 MHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency.
             Screen Capture File_________________

             l. Verify the readings meet the requirement in FAA-E-2996.


3.5.2.6.7    Out-of-Band Spurious Output

             a. Set up a spectrum analyzer connected to the output of the DME transponder with 40 dB
             attenuation and set trigger to FREE RUN. Watch the spurs caused by the spectrum analyzer.

             b. Set the spectrum analyzer resolution and video bandwidths at 1 kHz each, set the start
             frequency to 10 MHz and the stop frequency to 400 MHz.

             c. Set the reference level to -10dBm. Set the display line to -80 dBm (-40 dBm + 40 dB
             attenuation. Examine and plot the spectrum of the output signal over the range of 10 MHz to
             400 MHz.
             Screen Capture File ______________

             d. Examine and plot the spectrum of the output signal over the range of 400 MHz to 800
             MHz.


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            Screen Capture File ______________

            e. Examine and plot the spectrum of the output signal over the range of 800 MHz to 960
            MHz.
            Screen Capture File ______________

            f. Examine and plot the spectrum of the output signal over the range of 1215 MHz to 1515
            MHz.
            Screen Capture File ______________

            g. Examine and plot the spectrum of the output signal over the range of 1500 MHz to 1800
            MHz.
            Screen Capture File ______________

            h. Change the center frequency of the spectrum analyzer to the second harmonic frequency.
            Turn the video averaging on the spectrum analyzer so that only the CW will be displayed.
            Screen Capture File ______________

            i. Record the level of the highest spur between 10 MHz and 960 MHz and 1215 MHz and
            1800 MHz.
            Screen Capture File ______________


            Highest Out of Band Spur _________ dBm
            LIMIT: -70 dBm MAX (-40 dBm +(10*Log (10kHz/1 kHz)-40 dB)


3.5.2.6.7.1 Voltage Standing Wave Ratio (VSWR) Protection

Test Objective(s): The objective of this test is to verify the requirements of the DME equipment VSWR
protection.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.2.6.7.1.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.



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Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.2.8     Inter-Pulse Output Level

            a. Set up a spectrum analyzer using 30 dB of attenuation on the output of the transponder.

            b. Set up the center frequency of the spectrum analyzer to the output frequency of the
            transponder. Set frequency span to 0 Hz, Resolution Bandwidth to 3 MHz, and sweep time to
            20 μsec. Push the video trigger button. Turn on video averaging.

            c. Add 20 dB of attenuation to the input of the spectrum analyzer.

            d. Verify the transponder is enabled.

            e. Use the Reference level control to set the pulse peaks at the top line of the display
            graticule. Move the display line to -60 dB with respect to the top line (this will be -80 dB
            when the 20 dB attenuator is removed).
            Screen Capture File_____________

            f. Remove the 20 dB attenuator and reconnect the cable.

            g. Verify that there is 1 μs period between the pulses where the level is below 60 dB (80 dB)
            on the analyzer indicating the system meets the requirements in FAA-E-2996.
            Screen Capture File_____________


3.5.2.6.9 Retriggering of Transponder
See Procedure 3.5.2.2.2.1.


3.5.2.6.10 Equivalent isotropically Radiated Power (EIRP)

Test Objective(s): The objective of this test is to verify the requirements of the DME equipment EIRP.


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Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: The manufacturer shall provide the appropriate
documents to meet the requirements as indicated in the equipment specification.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.2.6.10.

Procedures:

Analyze the data provided by the equipment manufacturer to verify the requirements in the DME
specification.

Data Collection, Recording and Reduction: Analysis (A) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.2.7     Stabilization of Performance Characteristics

            a. This procedures is verified in the Monitor Response Time. It validated that the time the
            transmitter turn on to fully operational mode (Monitor normal indication in 3 seconds)

            b. In the Monitor Response Time procedures the transponder is timed to measure the amount
            of time to arrive at fully operational state.

            c. Use the measurement to verify the requirement in FAA-E-9996.

“After power has been applied to the transponder for not more than five minutes in standby mode, upon
transfer to operational mode the transmitter shall result in a fully compliant operational system within 3
seconds.”




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3.5.2.8     Duty Cycle Overload Protection

Test Objective(s): The objective of this test is to verify the requirements for duty cycle overload
protection of the DME equipment.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: None.

Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.2.8.

Procedures:

The equipment manufacturer shall demonstrate a mean by which the equipment is protected
against the effect of excessively high transponder output pulse rate caused by malfunction of
squitter, identification, or receiver AGR circuits.

Data Collection, Recording and Reduction: Demonstration (D) will be used to collect the test data. Data
shall be recorded on OT test Log Forms and any discrepancies shall be recorded on
Discrepancy/Improvement Forms. At the discretion of the Test Director, these forms may be either hand-
written or recorded electronically. When recording data on the Test Log Forms, address each item in the
respective Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.2.9     Thermal Overload Protection

Test Objective(s): The objective of this test is to verify the requirements for thermal overload protection
of the DME equipment.

Initial Setup/Configuration: All documentation is in its final storage location and the DME is in a fully
operational configuration.

Test Personnel Requirements: Test director and evaluation team

Test Support Hardware, Software and Documentation: None.


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Evaluation Criteria: DME equipment meets the requirement in FAA-E-2996 paragraph 3.2.9.

Procedures:

Inspect the DME system cabinet to verify the requirements from the DME specification.

Data Collection, Recording and Reduction: Inspection (I) will be used to collect the test data. Data shall
be recorded on OT test Log Forms and any discrepancies shall be recorded on Discrepancy/Improvement
Forms. At the discretion of the Test Director, these forms may be either hand-written or recorded
electronically. When recording data on the Test Log Forms, address each item in the respective
Procedures section in an item by item checklist format.

Objective met during the course of Operational Test:

��Yes
�� No
Comments (Must provide comments if “No”):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________


3.5.3       Antenna

The antenna shall be tested independently from the system to the requirements given in paragraph 3.3 of
FAA specification FAA-E-2996. This test shall be observed by government employees to assess
validation of the procedures to meet the antenna requirements.


3.5.4       Monitor


3.5.4.1     Operating Channels

            a. Assure that the DME is in the NORMAL operation.

           b. Using PMDT put the DME system in Local Control, bypass or maintenance mode
to bypass the monitor

NOTE: For TEST PURPOSES, AC/DC power must be removed from the module before removing
the module from the card cage.

            c. Connect the frequency counter to appropriate test point XX in the monitor signal
            generator.




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             d. Measure and record the frequency (ground station receive frequency, airborne
             interrogator). Verify that the frequency is within the tolerance of FAA-E-2996.

             Channel 53Y Measured Frequency ____________
             LIMIT: 1076.98923 MHz to 1077.01077 MHz

Note: Before returning the DME to NORMAL operation, complete the frequency stability test.


3.5.4.1.1    Frequency and Accuracy Stability -.

             a. Select the channels listed below. Refer to the appropriate Section of the MIB for the
             frequency change. Verify the measurement and record the frequency

             Channel     Nominal RF freq.        Measured         Limit
             1X          1025 MHz                ___________      1024.98975MHz to 1025.01025MHz
             63X         1087 MHz                ___________      1086.98975MHz to 1087.01025MHz
             1Y          1025 MHz                ___________      1024.98975MHz to 1025.01025MHz
             63Y         1087 MHz                ___________      1086.98975MHz to 1087.01025MHz
             126X        1150 MHz                ___________      1149.98975MHz to 1150.01025MHz

             b. Verify the readings meet the requirement in FAA-E-2996.

             c. Disconnect the frequency counter. Re-install the receiver module.

             d. Return DME to the assigned channel (53Y).


3.5.4.2      Monitor RF Input/Output Signal Coupling

Verify the system uses devices internal to the monitor hardware to sample the radiated power of the
transponder through the antenna monitor probes and that the remaining monitoring functions are
accomplished through the monitor probes or a coupler.

The Anritsu Vector Network analyzer test equipment can be used the actual measurement.


3.5.4.3      Interrogation Signal Generator


3.5.4.3.1    Operational Modes

Refer to paragraph 3.5.4.1 and 3.5.4.1.1 to confirm that the system meets the requirements in FAA-E-
2996 paragraph 3.4.3.1.


3.5.4.3.2    Pulse Synchronization Output (Interrogation Signal Generator Output Pulse)


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The interrogation signal generator output pulse procedure was verified in paragraph 3.5.4.1.


3.5.4.3.3    RF Output Pulse Signal

             a. Assure that the DME is in the NORMAL operation.

             b. Log ON to the PMDT. Confirm the DME is set to 53Y with a sensitivity setting of -94
             dBm.

             c. Using PMDT, put the DME system in Local Control, bypass or maintenance mode
             to bypass the monitor

NOTE: For TEST PURPOSES, AC/DC power must be removed from the module before removing
the module from the card cage.

             d. In the PMDT and the appropriate test equipment set level and frequency as required to
             meet FAA-E-2996.

             e. Connect the external trigger of the oscilloscope to appropriate test point XX in the
             interrogation generator and connect Channel 1 of the oscilloscope to detected interrogation
             signal test point XX.

             f. Use the oscilloscope to measure automatically (if function is available in scope) the pulse
             shape characteristics in the rise time, pulse top, pulse duration, and decay time.

             g. Set the sweep time to 1 or 2μs/division. You may need to trigger of the Channel 1 signal.
             Screen Capture file in X-Channel_____________
             Screen Capture file in Y-Channel_____________

The oscilloscope will be used to measure the pulse shape characteristics in the following paragraph
3.5.4.3.3.1 through 3.5.4.3.3.5.

3.5.4.3.3.1 Rise Time

             a. Confirm the DME is operational.

             b. Measure the rise time of the first pulse from 10% to 90% point on rising edge
             Measured rise time ______μsec
             LIMIT: 2.5 ±0.5 μsec


3.5.4.3.3.2 Pulse Top

             a. Measure the instantaneous amplitude of the pulse shape which shall not, at any instant
             between the point of the leading edge which is 95% of maximum amplitude and the point of


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             the trailing edge which is 95% of the maximum amplitude, fall below a value which is 95%
             of the maximum voltage amplitude of the pulse.

             b. Verify the pulse remains at or above 95% between the 95% point of the leading edge and
             95% of the trailing edge _______(YES/NO).


3.5.4.3.3.3 Pulse Duration (Pulse Width)

             Measure the duration of the pulse (measure the pulse duration from the 50 percent point of
             the rising edge to the to 50 percent point of the falling edge).

             Measured pulse width ______ μsec
             LIMIT: 3.5 ± 0.5μsec


3.5.4.3.3.4 Decay Time (Fall Time)

             Measure the decay time of the pulse (measure the decay time from the 90 percent point to 10
             percent point of the falling edge).

             Measured fall time _________ μsec
             LIMIT: 1.5 to 3.0μsec


3.5.4.3.4    Pulse Coding (Pulse Spacing)

Using an oscilloscope and the DME instruction manual, the pulse spacing can be measured and recoded.
Pulses shall be coded in pairs with a spacing, as measured between the 50 percent maximum voltage
amplitude point on the leading edge of the first RF pulse to the corresponding point on the leading edge of
the second RF pulse, of (a) 12 (±0.25) μsec for “X” Channels or, (b) 36 ((±0.25) μsec for Y-Channels.

             a. Use the oscilloscope to manually or automatically (depending on oscilloscope) measure
the time between the 50% amplitude point of the leading edge of the first pulse and 50% amplitude point
of the leading edge of the second RF pulse.

             Measured pulse spacing ______ μsec
             LIMIT: (a) 12 (±0.25) μsec for “X” and (b) 30 ((±0.25) μsec for Y-Channels.


             b. Set the DME for Y channel operation. Confirm the DME is operational mode.
             Measure the pulse spacing________ μsec
             LIMIT: 35.75 to 36.25 μsec (Y channel)

             c. Disconnect the oscilloscope.

             d. Return the DME to NORMAL operation.


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3.5.4.3.5    Pulse Power Variation

The peak power of the constituent pulses of any pair of pulses shall not differ by more than 0.5 dB.

             a. Log On to the PMDT. Confirm the DME is in NORMAL operation with a sensitivity
             setting -94 dbm.

             b. In the PMDT, put the DME in Local Control, bypass, or maintenance mode to bypass the
             monitor.

             c. Using the PMDT and the required test equipment, set the level and frequency in the
             interrogation signal generator as needed to meet the requirement in FAA-E-2996.

             d. Connect the power peak meter to the interrogation signal generator output, test point XX.

             e. Measure the peak pulse power of the first pulse of the pulse pair and of the second pulse of
             the pulse pair. The pulse pair are easily seen in th Agilent N1911 power peak meter.
             First pulse measurement __________dB, Second Pulse Measurement _________dB
             Δ = ______________
             LIMIT: 0.5 dB

             h. Verify the DME meet the requirements in FAA-E-2996.

             i. Disconnect the power meter.

             j. Return the DME to NORMAL operation.


3.5.4.3.6    Detected RF Output Signal

This procedure was validated in paragraph 3.5.4.3.3.


3.5.4.3.7    RF Pulse Spectrum

The following procedures will be conducted for the interrogation signal generator. At least 90 percent of
the output signal RF energy shall be contained in a 0.5 MHz centered frequencies 0.8 MHz above and 0.8
MHz below the nominal channel frequency in each case shall not exceed 200 mW, and the effective
radiated power contained in a 0.5 MHz band centered on frequencies 2 MHz above and 2 MHz below the
nominal channel frequency in each case shall not exceed 2 mW. The effective radiated power contained
within any 0.5 MHz band shall decrease monotonically as the band center frequency moves away from
the nominal channel frequency.

             a. Log On to the PMDT. Confirm the DME is in NORMAL operation.



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             b. Put the DME system in Local Control, bypass, or maintenance mode to bypass the
             monitor.

             c. Connect the Spectrum Analyzer with appropriate test point XX in the interrogation
             generator. This connection shall be done by the receiver input.

             d. Using the PMDT and appropriate test equipment set the correct level and frequency as
             required in FAA-E-2996.
             e. Set up the spectrum analyzer on the center frequency (Receiver Fo) of the DME. Set span
             to 5 MHz, Resolution Bandwidth to 30 kHz, and video bandwidth to 100 kHz. Set the seep
             time to 5 seconds. Set the spectrum analyzer detector to positive peak mode.

             f. Set the peak of the pulse to the reference (top) of the analyzer.

             g. Locate the frequency +800 kHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency.
             Screen Capture File_______________


             h. Locate the frequency -800 kHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency.
             Screen Capture File________________

             i. Set up the display line at -43 dB from the reference level.

             j. Remove the 20 dB attenuator.

             k. Locate the frequency +2 MHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency
             Screen Capture File_________________

             l. Locate the frequency -2 MHz from the center frequency and record a signal strength
             measurement relative to the peak center frequency.
             Screen Capture File_________________

             m. Verify the readings meet the requirement in FAA-E-2996.

             o. Disconnect the spectrum analyzer.

             p. Return the DME to NORMAL operation.


3.5.4.3.8    Spurious Output

             a. Log On to the PMDT. Confirm the DME is in NORMAL operation.




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         b. Put the DME system in Local Control, bypass, or maintenance mode to bypass the
         monitor.

         c. Connect the Spectrum Analyzer with appropriate test point XX in the interrogation
         generator. This connection shall be done by the receiver input.

         d. Using the PMDT and appropriate test equipment set the correct level and frequency as
         required in FAA-E-2996.

         e. Connect the Spectrum Analyzer with appropriate attenuation to the monitor I/O panel.

         f. Configure the spectrum analyzer for the receiver Fo (1077 MHz) frequency.

         g. Set the span to 5 MHz, resolution bandwidth to 30 kHz, video bandwidth to 100 kHz and
         sweep time to 5 seconds.

         h. Set the spectrum analyzer to positive peak mode.

         i. Set the peak of the pulse to reference (top) of the spectrum analyzer.

         j. Set up the spectrum analyzer connected to the output of the Interrogation Signal with
         appropriate attenuation and then set trigger to FREE Run. Watch for spurs caused by the
         spectrum analyzer.

         k. Set the spectrum analyzer to span from 10 MHz to 1039 MHz, 5 sec sweep, resolution
         bandwidth 1 kHz, video bandwidth to 1 kHz.

         l. Look for spurs above -40 dBm.

         m. Set the center frequency to that of the spur and change the resolution bandwidth to 1 kHz
         and a span of 100 kHz.

         n. Verify the spur’s signal level is less than -40 dBm.

         o. Set the spectrum analyzer to span from 1085 MHz to 1800 MHz, 5 sec sweep, resolution
         bandwidth 1 kHz, video bandwidth to 1 kHz.

         p. Look for spurs above -40 dBm.

         q. Set the center frequency to that of the spur and change the resolution bandwidth to 1 kHz
         and a span of 100 kHz.

         r Verify the spur’s signal level is less than -40 dBm.

         s. Set the spectrum analyzer to 0 Hz span, resolution and video bandwidth 100 kHz, sweep
         time of 50 ms, the center frequency appropriately, an trigger as needed.



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            t. Enable Video Average and perform a peak search.

            u. Record the peak level during a pulse.
            Measure value __________dB

            v. Turn on the display line and set it for the level of the noise between pulses.

            w. Record the delta between the peak and the display line.
            Δ = __________

            x. Verify at leat 80 dB difference between the pulse peak power and the noise floor.

            y. Verify the noise floor is lower than -50 dBm at the injection port (-80 dBm and the
            receiver). Measured value ________dBm.
                Screen Capture SCREN______gif

            z. Use the measurement to verify the requirement in FAA-E-2996.

3.5.3.9     Test RF Output Frequency

Using a frequency counter and the system instruction manual a test point or connector shall be used to
measure the frequency of the interrogation signal generator at the nominal interrogation frequency, at
±200 kHz and at ±900 KHz.

            a. Log On to the PMDT. Confirm the DME is in NORMAL operation.

            b. Put the DME system in Local Control, bypass, or maintenance mode to bypass the
            monitor.

            c. Connect the Spectrum Analyzer with appropriate test point XX in the interrogation
            generator. This connection shall be done by the receiver input. Connect the frequency
            counter to appropriate test point XX.

            d. Using the PMDT and appropriate test equipment set the correct level and frequency as
            required in FAA-E-2996.

            e. Take a measurement of the frequency counter for the nominal interrogation frequency.
            Measure Frequency ____________________MHz


            f. Measure the power of the interrogation signal output with a spectrum analyzer. Set the
            Span to 0 Hz, sweep to 50 ms, resolution bandwidth to 100 kHz, video bandwidth to 100
            kHz, and set the center frequency appropriately.
            Measure power __________dBm

            g. In the PMDT or test equipment, change Frequency Deviation from nom: to +200
            kHz and select Start.


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          h. Take a measurement of the frequency counter for the offset signal.
          Measure Frequency ____________________MHz

          i. Measure the interrogation signal output power with a spectrum analyzer.
          Measure power ____________________dBm

          j. In the PMDT or test equipment, change the frequency deviation to -200 KHz.

          k. Take a measurement of the frequency counter for the offset signal.
          Measure Frequency ____________________MHz

          l. Measure of the interrogation signal output power with a spectrum analyzer.
          Measure power ____________________dBm

          m. In the PMDT or the test equipment change the frequency deviation to +900 kHz.

          n. Take a measurement of the frequency counter for the offset signal.
          Measure Frequency ____________________MHz

          o. Measure of the interrogation signal output power with a spectrum analyzer.
          Measure power ____________________dBm

          p. In the PMDT or the test equipment change the frequency deviation to -900 kHz.

          q. Take a measurement of the frequency counter for the offset signal.
          Measure Frequency ____________________MHz

          r. Measure of the interrogation signal output power with a spectrum analyzer.
          Measure power ____________________dBm

          s. Verify that these measurement meet the requirement in FAA-E-2996.

          t. Disconnect the frequency counter and spectrum analyzer.

          u. Return the DME to NORMAL operation.


3.5.4.3.10 RF Output Level Calibration

          a. Review the PMDT screen Monitors configuration, alarms limits any pertinent screen, i.e.,
          screen set-up to verify that the loss or losses appropriated entered.

          b. Using the DME instruction manual, verify that the system meets the requirement in FAA-
          E-2996.
          Reference MIB paragraph_____________



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3.5.4.3.11 RF Output Level and Accuracy

Using a power meter and the system instruction manual connect the power meter to a connector or test
point to correctly confirm the output power with respect to the internal attenuation of the interrogation
signal generator and the system.

            a. Log On to the PMDT. Confirm the DME is in NORMAL operation.

            b. Put the DME system in Local Control, bypass, or maintenance mode to bypass the
            monitor.

            c. Connect the Spectrum Analyzer with appropriate test point XX in the interrogation
            generator. This connection shall be done by the receiver input.

            d. Using the PMDT and appropriate test equipment set the correct level and frequency as
            required in FAA-E-2996.

            e. Measure the power output with a spectrum analyzer. Set up the spectrum analyzer with
            appropriate attenuation(usually 30 dB). Set the Span to 100 kHz, sweep to 250 ms, resolution
            bandwidth to 100 kHz, video bandwidth to 100 kHz, and set the center frequency
            appropriately.

            f. Record the peak level.
            Measure power __________dBm

            g. In the PMDT or appropriate test equipment change the level to -100 dBm.

            h. Record the peak level.
            Measure power __________dBm

            i. Verify the delta is greater than 90 dB to ensure the dynamic range requirements in FAA-E-
            2996 paragraph 3.4.3.11.

            j. . In the PMDT or appropriate test equipment change the level to -40 dBm.

            k. Record the peak signal level as a reference level.
            Measure power __________dBm

            n. . In the PMDT or appropriate test equipment change the level to -39 dBm.

            o. Record the peak signal level as the +1 dB step.
            Measure power __________dBm
            LIMIT: ≤1 dB

            p. . In the PMDT or appropriate test equipment change the level to -41 dBm.

            q. Record the peak signal level as the -1 dB step.


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             Measure power __________dBm
             LIMIT: ≤1 dB

             r. . In the PMDT or appropriate test equipment change the level to -42 dBm.

             s. Record the peak signal level as the -2 dB step.
             Measure power __________dBm
             LIMIT: ≤ 1dB

             t. . In the PMDT or appropriate test equipment change the level to -43 dBm.

             u. Record the peak signal level as the -3 dB step.
             Measure power __________dBm
             LIMIT: ≤1 dB

             u. In the PMDT or appropriate test equipment change the level to -44 dBm.

             v. Record the peak signal level as the -4 dB step.
             Measure power __________dBm
             LIMIT: ≤1 dB

             w. Calculate the signal step error.
             Δ = __________

             x. Verify that the system meet the requirement in FAA-E-2996.


3.5.4.4      Transponder Monitor

3.5.4.4.1    Monitor Alarm Action

All monitored parameters will be set to primary alarms tested using equipment internal to the DME to
validate the accuracy of the monitor. The internal tests also certify the Monitor’s ability to distinguish
between an alarm and normal condition. A fault will be generated and the time will be measured for
Alarm delay and Monitor response. The thresholds will be set per FAA-E-2996 paragraph 3.4.4.2.

             a. Log On to the PMDT. Confirm the DME is in NORMAL operation.

             b. Turn OFF the DME. Remove the Monitor Module and place it on an extender board.

             c. Turn ON the DME and confirm the DME is in NOEMAL operation.

             d. On the PMDT, select all monitor parameters to primary, including frequency. Set the
             shutdown delay time to the minimum setting.

             e. On the PMDT, view the screen with all the parameter and their Alarm Limits.



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         f. Capture the screen and validate that all tests pass successfully to validate that the high and
         low limits of the monitor will respond with a shutdown action.
         Screen Capture _______________.bmp for each parameter

         g. Connect Channel 1 of the oscilloscope trigger to the detected output pulse of the
         transmitter test point XX. Connect Channel 2 to the monitor fault signal, test point XX.

         h. Turn OFF the DME.

         i. Wait for the Monitor Primary alarm to be assessed for at least 10 seconds.

         j. Place the scope in single capture mode. Turn ON the DME.

         k. Verify the time from trigger to rising edge of channel two is less than three seconds.
         ______seconds
         Screen Capture TEK ________.png

         l. This test verifies the requirements in FAA-e-2996 paragraph 3.4.4.1.2 for Monitor
         Response Time.

         m. Place the DME in NORMAL operation. Place the scope in peak detect mode.

         n. Connect Channel 1 to the interrogation detection pulse test point XX.

         o. Connect Channel 2 to the reply detection pulse test point XX.

         p. Connect Channel 3 to the monitor Fault detection signal (Monitor Fault detector)

         r. Set the scope to 1 second/division. Set the scope for single acquisition on the rising edge
         of Channel 3.

         s. Disconnect the monitor return cable at the top of the cabinet. In some DME system, the
         return cable is inside the cabinet.

         t. Verify the time from loss monitor detected replies (when cable was disconnected) to the
         end of the radiation (no transmitted pulse) is less than 10 seconds.______ 10 seconds Max.
         Screen Capature TEK ________.png

         u. Use the readings and notes to verify the DME system meets the requirements in paragraph
         3.4.4.1, 3.4.4.1.1, 3.4.4.1.2, 3.4.4.1.2 and 3.4.4.2.




         v. Connect a valid keying source to the external Ident keying.

         w. Change the Keyer Input Level appropriately for the external keyer.


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             In the PMDT, change the DME setting to external Key Input.

             x. Set the Primary Ident Code to that of the keying source (so that DME does not
             shutdown on bad Ident code).

             y. Change alarm timer for “No Ident” in Monitor. Alarm Limits to 40 seconds.
             (Effectively 45 seconds with the 5 second alarm delay timer).

             z. Place the DME in Normal operational mode. Place the scope in peak detect
             mode.

             aa. Connect Channel 1 to the reply detection pulse test point XX.

             ab. Connect Channel 2 to the KEY test point XX.

             ac. Set the scope for 10 s per division. Set the scope for continuous acquisition with
             auto trigger.

             ad. Wait for at least one valid Ident cycle and stop the keyer.

             ae. Verify the time from the end of keyed signal on the scope to the end of radiation
             (no TX video) is 45 -0/+5 seconds. _________sec,
                 Screen Capture File ___________.png.


3.5.4.4.1.1 Alarm Delay time

See procedure 3.5.4.4.1

3.5.4.4.1.2 Monitor Response Time

             a. Log On to the PMDT. Confirm the DME is in NORMAL operation.

             b. Connect CH1 of the oscilloscope to transmitted (reply) detection circuit test point XX.
             Connect CH2 to the pulses detected from Antenna probe, test point XX. Trigger the
             oscilloscope from the appropriate test point XX.

             c. Set the scope to 1 second per division. If available in the scope, set the scope for single
             acquisition on the rising edge.

             d. Disconnect the monitor cable (return cable).
             Screen Capture File TEK _________.png

             e. Verify the time from loss monitor detected replies (when the cable was disconnected) to
             end of radiation no transmit video is less than 10 seconds.

3.5.4.4.2    Monitored Parameters Fault Thresholds


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3.5.4.4.2.1 Required Parameters

See the procedure in paragraph 3.5.4.4.


3.5.4.4.3    Test Signal and Monitoring Activities

             a. Connect a frequency counter to Interrogation trigger test point XX (Generation Signal).

             b. Measure and record frequency _______________
             LIMIT: 120 Max.


3.5.5        Control/Status/Indication Functions


3.5.5.1      Control Functions

The control unit shall provided local and remote control of the DME. Any monitored alarms shall be
provided locally and remotely. The control unit shall provide for automatic shutdown in response to
alarms by the monitor equipment.

The equipment manufacturer shall provide a procedure with all the test points to meet the requirements in
FAA-E-2996 paragraph 3.5.1.


3.5.5.1.1    Local/Remote Control Functions

The equipment manufacturer shall provide a procedure with the all test points to meet the requirements in
FAA-E-2996 paragraph 3.5.1.1.

             a. The DME equipment shall provide for Local and Remote Control of the DME- Set
             up the DME as shown in Figure 6 for Local/Remote Control.

             b. Connect the a PMDT to the front panel and to the remote modem.

             c. Verify basic functionality. Check when complete ___

             d. The DME shall provide automatic shutdown of the transponder in response to the
             alarms sensed by the monitor equipment.

             f. Remove the antenna monitor probe from the top of cabinet.

             g. Verify DME shutdown. Check when complete_______



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         h. Re-install the antenna monitor cable. Turn the DME transponder on using the
         PMDT.

         i. DME system shall provide a mode of operation in which only the monitor
         shutdown action is inhibited with appropriate indication as required in
         paragraph 3.5.3.1 of the FAA-E-2996.

         j. Use Local PMDT to go into Local Control, bypass, or maintenance mode to
         bypass the monitor. Remove antenna monitor probe from top of cabinet.

         k. Verify DME does not shut down (monitor shutdown action inhibited). Check when
         complete ______


         l. Set/reset the DME to a known state. Use local PMDT to demonstrate the ability to
         turn DME ON and OFF. Check when complete ____




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                    Dedicated line modem                     Dedicated line modem




                                    RS-232                                 RS-232




                                                                 Remote PC




                                                   RS-232

                          DME


                                                                        Local PC




                                      Figure 6. Local/Remote Control


3.5.5.1.2    Local Control Function

             The following control functions will be provided as a minimum in the local control
             environment. A manual operation (button, switch, etc.) shall be provided so as to be
             easily accessible from the front of the DME to select from local or remote control.
             This operation shall take precedence over any current remote control so that only
             local control is enabled. Take control of the DME using the front panel. Attempt to
             change DME channel from the remote PMDT. If not successful then requirement
             demonstrated. Check when complete ______


3.5.5.1.3    Remote Control Functions




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             a. The following control functions will be provided as a minimum in the remote
             control environment. Shall respond to all control operations with a command
             acknowledgment and an indication of either successful command execution or
             command failure, including communication faults; - From remote computer turn
             transponder off and on. Verify status screen indicates if command was successful.
             Leave transponder on. Unplug remote PMDT from modem to cause a
             communication fault. Note resulting message. Check when complete ____


             b. Shall enforce pre-established user access control rules when performing a control
             operation; Log off of local PMDT. Log on using lowest security level. Attempt to
             place DME in Local Control, bypass, or maintenance mode to bypass the monitor
             (will not be possible to do this). Check when complete ____.

             c. Shall be able to adjust fault thresholds; Log off PMDT. Log ON at highest
             security level. Adjust reply delay threshold. Examine PMDT screen to verify change
             was made. Return threshold to initial value. Check when complete _____.

             d. Shall be able to adjust parameters that determine automatic fault isolation and
             fault recovery processing; Fault isolation parameters can not be adjusted.


             e. Shall perform diagnostics to detect and/or isolate faults; Run fault isolation from
             remote PMDT. Note that no failures are present. Check when complete _______.


             f. Shall be able to configure the automatic reset function specified in paragraph
             3.5.1.4 of FAA-E-2996; Tested as part of 3.5.1.4

             g. Shall be able to perform a monitor integrity test (MIT) on the transponder monitor.
             Run MIT from remote PMDT. Check when complete _______.


3.5.5.1.4    Automatic Reset Function

             The automatic reset function shall be inherent to the DME equipment and provide the
             following:

             a. Shall provide for automatic reset and restart of the equipment subsequent to
                shutdown due to an alarm action;

             b. Shall be configurable through the remote environment;



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            c. Shall be configurable to provide up to three user-defined reset/restart time
                intervals.
To verify the above requirements, setup the automatic reset using the remote PMDT. Set it up so
in the event of an alarm the system will restart 3 times with a 2 minute delay. Verify the system
is operating normally. Remove the cable from the antenna monitor probe from the top of the
cabinet. Verify three restarts are attempted. Restore cable. Restore DME to normal operation.
Check when complete _____.


3.5.5.2      Status Function


3.5.5.2.1    Local/Remote Status Functions

The equipment manufacturer shall provide a procedure with all test points to meet the requirements in
FAA-E-2996 paragraph 3.5.2.1


            The following status functions will be provided as a minimum in the local status
            environment and the remote status environment.

            a. Shall determine and report the operating status of each DME subsystem;

            b. Shall monitor the primary and backup equipment of each DME;

            c. Shall perform monitoring without interfering with the operation of the DME;

            d. Shall perform monitoring automatically without the need for user intervention;

            e. Shall determine and report the logical and physical configuration of the DME
            elements to the extent that is practical;

            f. Shall determine and report the availability status of DME elements;

            g. Shall report changes in the fault, configuration, performance, or security status of
            the system.

Examine the status screen of the remote or local PMDT. Verify the status of the system is
apparent. The system being tested does not include a backup monitor or transponder. Verify
there are provisions to see the status of a backup monitor or transponder for dual systems.
Automatic monitoring was confirmed in previous tests. Verify the operator can determine the
configuration of the system is single monitor, single transponder. Verify the status of the
monitor and transponder can be determined. Remove AC power. Verify this change in status is
noted on the remote PMDT. Check when complete ________.


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3.5.5.2.2    Local Status Functions

            Local Status Functions. - There are no status functions that are required as a
            minimum in the local status environment only. Those listed in paragraph 3.5.5.2.1 as
            being required for both the local and remote environments are required.


3.5.5.2.3    Remote Status Functions

            Remote Status Functions. The following status functions will be provided as a
            minimum in the remote status environment.


          a. Shall determine and report the status of the DME environment (e.g., smoke, fire, or
             temperature attributes);____(YES/NO)

          b. Shall determine and report system resource utilization; - transmitter utilization
             reported on executive data screen. View data screen (duty cycle). Check when
             complete ______

          c. Shall report all users logged onto the monitored system automatically; - At local
             PMDT. Check history and make note of local log-on’s. Check when complete
             ______

          d. Shall provide a summary alarm for all major components, which reports the failure or
             imminent failure of the system. This may be a roll up of selected alarms when said
             alarms taken separately may not endanger the system integrity but when taken
             together, result in a loss of service or imminent loss of service; - Remove antenna
             monitor probe. Note alarm on PMDT screen. Note summary alarm indication.
             Restore to normal operation. Check when complete _______

          e. Shall provide the capability to configure the system so alarms are not generated or
             distributed from the Remote Monitoring System (RMS) when the system is
             commanded off or when a system is off as a normal state. Command system off from
             local PMDT. Examine remote PMDT to confirm an alarm condition is not indicated.
             Check when complete_______.


3.5.5.3      Indicator Functions

          Indicator Functions. - The DME will have the following indicator functions as a
          minimum available in a local environment, remote environment, or both. The following


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        paragraphs describe what each environment requires as a minimum for indicator
        functions.

        Tested below.


3.5.5.3.1    Local/Remote Indicator Functions

        Local/Remote Indicator Functions. - The following indicator functions will be provided
        as a minimum in the local indicator environment and the remote indicator environment:

        a. Shall provide for local and remote indication of the monitor alarm condition;

        b. Shall provide for local and remote indication of the mode of operation defined in
        paragraph 3.5.1.1 item c; (bypass)

        c. Shall provide for indication of the system operating on battery power:

        d. Shall provide for indication of AC power failure.
        Remote indication not submitted for approval. Examine DME front panel. Verify the
        operator can determine alarm condition, presence of bypass, and operation on batteries
        because of loss of AC power. Check when complete _____


3.5.5.3.2    Local Indicator Functions

  Local Indicator Functions. - The following control functions will be provided as a minimum
  in the local indicator environment:

        a. A visual status indicator shall be located on the front of the equipment and shall
        provide a positive indication whenever an alarm condition exists. The following colors
        shall be used for indicators: Green normal operation, Amber/Yellow alert condition, and
        Red alarm condition.

        b. An aural alarm shall provide indication in response to an alarm condition. A manual
        operation (button, switch, etc.) shall be provided to permit silencing of the aural alarm.
        This manual operation shall be accessible from the front panel of the DME.


Use button on front panel to obtain control of DME. Note Green indicators indicating normal
operation. Remove AC power. Note amber indicators. Restore AC power. Cause an alarm by
removing the antenna monitor probe. Note red indicators and aural alarm. Use button provide to
silence the alarm. Restore system to normal operation. Check when complete ______


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3.5.5.3.3    Remote Indicator Functions

The equipment manufacturer shall provide a procedure with all test points to meet the requirements in
FAA-E-2996 paragraph 3.5.3.3


3.5.6        Remote Monitoring System

The equipment manufacturer shall provide a procedure with all test points to meet the requirements in
FAA-E-2996 paragraph 3.6.


3.5.6.1      Additional Requirements

The equipment manufacturer shall provide a procedure to meet the requirements in FAA-E-2996
paragraph 3.6.1.


4.0          Diagnostic Procedures – Verified that the Diagnostic procedures contained in the DME MIB
             are valid. Refer to appropriate section in MIB.

A fault shall be put in each module and the diagnostic test shall identify the faulty module.

The manufacturer are required to provide a list of all the module use in the HPDME and LPDME.

             Module                           Selected Fault                      Indicated Module
Transmitter (HPDME)
Monitor
Receiver
BCPS
RF Generator or ISG




BCPS

Does the Diagnostic Test correctly identify the faulty module?     ______(YES/NO)


4.1          Mean Time Between Failures – The MTBF must be greater than 8760 hours. A MTBF
             analysis will be supplied by the equipment manufacture and is included in Attachment 4.
             Does the system meet the requirement of 8760 hours? ______ (YES/NO)


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Note. Per the analysis the system shall meet and or exceeds the MTBF.


4.2        Mean Time to Repair –A MTTR analysis will be supplied by the equipment manufacture
           and is included in Attachment 7.
           Does the system meet the requirements? _____(YES/NO)




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posted:1/11/2011
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