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									           Transport Canada       Transports Canada
           Safety and Security    Sécurité et sûreté



                     AIRCRAFT MAINTENANCE & MANUFACTURING STAFF INSTRUCTION


Subject:                                                                     Number:                  MSI 23

         Maintenance Review Board Procedures, and Manufacturers              Revision No:                1
     Recommendations (Reference: TP 13850 – Scheduled Maintenance
     Instruction Development Processes and TP 14331 Enhanced Zonal
                          Analysis Procedures)

                                                                             Number of Pages:            2

File No:                         AARP-5009-3-23                              Issue Date:           May 9, 2006


1.   PURPOSE

     1.1 This Maintenance Staff Instruction (MSI) identifies acceptable procedures and guidelines for use by Civil
         Aviation Safety Inspectors and industry personnel during the initial convening of a Maintenance Review
         Board (MRB) process and thereafter, during the sustaining operation of that MRB.

     1.2 This MSI also identifies acceptable procedures and guidelines for use by Civil Aviation Safety Inspectors
         and industry personnel when a manufacturer’s recommended maintenance schedule is being developed
         and the MRB process is not being utilized.

2.   BACKGROUND

     2.1 Transport Canada initially provided Maintenance Review Board (MRB) guidelines in Airworthiness Manual
         Advisory (AMA) 571.101/3. AMA 571.101/3 was cancelled October 10, 1996 with the publication of the
         Canadian Aviation Regulations. Since that time and as an interim measure, Transport Canada utilized this
         MSI to recognize Federal Aviation Administration (FAA) Advisory Circular (AC) 121-22A in place of the
         AMA.

     2.2 In 2003, Transport Canada initiated an amendment to CAR Standard 625 Appendix E with NPA 2003-294.
         This NPA recognizes Transport Publication TP 13850, Scheduled Maintenance Instruction Development
         Processes. TP 13850 at Part B replaces the FAA Advisory Circular 121-22A and provides the current
         acceptable procedures and guidelines to be used during the development and subsequent operation of an
         MRB process. TP 13850 at Parts C and D provides additional guidance for Industry when developing
         maintenance schedules that will be published as “Manufacturer’s Recommendations”.

     2.3 TP 13850 has been harmonized with FAA Advisory Circular AC 121-22A “Maintenance Review Board
         Procedures”; and the EASA recognized JAA Administration and Guidance Material, Section Two:
         Maintenance, Part Two: Procedures, Chapter 16: “Procedure for Maintenance Review Board”.

     2.4 In 2005, Transport Canada published TP 14331, “Enhanced Zonal Analysis Procedures (EZAP)” as a
         companion document to TP13850 and is used when the enhanced zonal analysis procedure is being
         worked during the application of MSG-3. TP 14331 is recognized by Transport Canada as providing the
         additional guidance necessary for the proper execution of the latest approved revision of MSG-3 logic.


3.   PROCEDURES

     3.1 The guidance material to be utilized by industry and Transport Canada for initially establishing and then
         sustaining the Maintenance Review Board (MRB) process is detailed in Part B of TP 13850 – Scheduled
         Maintenance Instruction Development Processes. The enhanced zonal analysis procedures contained in
         TP 14331 are provided for the additional guidance for analysts when performing that portion of the MSG-3
                                   MSI 23- Maintenance Review Board Procedures



         analytical methodology to develop applicable and effective tasks for the maintenance of electrical wire
         interconnection systems (EWIS).

     3.2 For aircraft not using the Maintenance Review Board process, industry and Transport Canada personnel will
         find at Part C and D of TP 13850, additional guidance for the development of a Manufacturer’s
         Recommended Maintenance Schedule for the aircraft.

4.   EFFECTIVE DATE

     4.1 This instruction comes into effect immediately.

5.   HQ CONTACT

     5.1 The responsible officer indicated below may be contacted for information regarding this MSI:


                                         Superintendent, Aircraft Evaluation (AARPG)
                                         Aircraft Maintenance & Manufacturing Branch
                                         E-mail:     aarpg@tc.gc.ca
                                         Phone:      (613) 990-1069
                                         Facsimile: (613) 952-3298



Intranet: http://info.tc.gc.ca/aviation/mainten/aarpc/msi/index.htm

Internet: http://www.tc.gc.ca/aviation/mainten/aarpc/msi/index.htm




D.B. Sherritt
Director,
Aircraft Maintenance and Manufacturing




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