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FIM CPDLC Safety Work - FAA

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					RTCA SC-214/
EUROCAE WG78

CPDLC OSA/OPA Status




     By:    Willem Brondsema
            EUROCONTROL
       &    Todd Kilbourne
            Systems Enginuity, Inc.
    Date:   September 28, 2011
CPDLC OSA Status
•   Latest draft version I distributed to CSG/VSG on 19 Sept 2011
•   Major changes in 19 Sept 2011 version
    – Draft of Oceanic SRs Integrated into the CPDLC OSA from DO-
      306/ED122
         • need to handle SC-214 SRs that do not directly match DO-306/ED122 SRs
    – FIM safety analysis added
    – Graphical D-TAXI added
    – Addition of FT for Hazard OH-CPDLC-2 (Severity 4) “Loss of Service for 
      Multiple Aircraft”
    – Changes to FTs for hazards OH-CPDLC-3 through 6 (FTs for OH-
      CPDLC-7 through 9 still need work)
         • Wim and Todd made further refinements to FTs and SR tables for Hazards 
           OH-CPDLC-3 through OH-CPDLC-5 on 27 September 2011




CPDLC OSA - RTCA SC-214/EUROCAE WG78
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September 28, 2011
CPDLC OSA Status (Cont.)
•   Major changes in 19 Sept 2011 version (Cont.)
    – Simplified human quantitative assumptions and provided better 
      supporting evidence [CARA – controller; System Safety … - Flight Crew] 
      added in an Appendix
         • Used for FT allocations only
         • Only qualitative requirements on humans in SRs


•   Relevant changes to SRs based on changes to FTs (not all
    changes to SRs have been reflected in the summary of SRs at
    the end)
    – Some of this has been done but not a full scrub yet
    – Bottom Line: no major changes to SRs so far
• Better explanation of unit conversions used in FTs/SRs has
  been added using a realistic scenario (2 hour domestic flight)
• PDRs are 90% aligned with current changes to OSA; will add
  PDRs for other changes as soon as possible

CPDLC OSA - RTCA SC-214/EUROCAE WG78
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September 28, 2011
CPDLC OSA Work to be Done
•   Add tracing of SRs to ATS functions
    – Recently discussed (on 27 Sept 2011) and found that all SRs apply to all 
      ATS functions except for two SRs: one specifically for DCL and one 
      specifically for Graphical D-TAXI
    – Therefore do not see need for separate table of SRs per ATS function
• Perform review of ASOR (FTs and SRs) for hazards OH-CPDLC-
  6,7,8, and 9
• OSA Integration: Find other requirements (ORs, IRs, etc.) for the
  “Category 3” SC-214 SRs that do not directly match up with DO-
  306/ED122 SRs that can be considered equivalent
• Check LWCE calculated for each hazard from estimated
  probabilities of Basic Causes through FT/ET to effect (for FAA
  ATO SMS use)
    – This is a check of acceptable safety risk for FAA ATO
•   Check to see if changes in CDPLC OSA affect 4DTRAD OSA

CPDLC OSA - RTCA SC-214/EUROCAE WG78
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September 28, 2011
CPDLC OPA Status
• Latest Version Draft OPA version I released is dated 13
  September 2011
• Work was focused on getting the RCP specifications correct in
  the spirit of GOLD and to smooth the integration with the
  Oceanic side
    –   Completed editorial improvements (RSP definitions, ATS functions, etc.)
    –   Completed RCP specifications for CPDLC and D-FIS
    –   Partially completed RSP specifications for ADS-C
    –   The Oceanic-based RCP240D and RCP400/D data from GOLD needs to 
        added to CPDLC OPA  




CPDLC OSA - RTCA SC-214/EUROCAE WG78
                                                                             ‹#›
September 28, 2011
OPA Issues
1) Confirm choice of RCP for FIM
2) Do we need Performance specifications for DLIC? It is
   currently included, but there is no ATS function behind it.
3) RCP60 for CPDLC was removed
    –    current thought is that CPDLC is not suitable to be that tight and have 
         observed opposition from pilots. Is this the right conclusion?
4) Three RCP types are needed to cover the various Continental
   ATS functions.
    –    Are 3 different tts times (ACC Comms, Complex Route, 4DTRAD) 
         manageable for an En-route centre?
    –    Do we need to differentiate between complex route clearance outside 
         4D TBO context with RCP180 and complex route clearance used in 4D 
         TBO with RCP300?
    –    Can we eliminate RCP180?



CPDLC OSA - RTCA SC-214/EUROCAE WG78
                                                                                    ‹#›
September 28, 2011
OPA Issues (Cont.)
5) All allocations are requirements, including times for the
    INITIATOR. However, a performance requirement on controller
    and pilot are rather controversial when it comes to Ops
    approval. Appropriate wording is required on its intention of
    the INIT times to take away the concerns of Operators and
    airframe manufacturers.
A complicating factor: there is not yet a description of a 
   representative HMI and Ops scenario to guide the certification 
   body.  
Question: How do we provide guidance on certification of human
   performance times?




CPDLC OSA - RTCA SC-214/EUROCAE WG78
                                                                     ‹#›
September 28, 2011
OPA Issues (Cont.)
6) Specified 99.9% probability for RCTP(aircraft), RCTP(ATSU),
     RCTP(ACSP).
     This is suitable for monitoring the performance throughout its
     lifetime. However, it is very difficult to show 99.9% compliance
     before a system is in operational use (requires 10,000
     exchanges to get a pretty stable picture).
   It was mentioned once to also specify the 99% value to ease
   compliance for airframe/avionics manufacturers. What are your
   ideas?
7) In continental airspace, the ADS-C application is not used for
     surveillance; however we suggest using RSP rather than RCP
     to remain consistent with oceanic terminology




CPDLC OSA - RTCA SC-214/EUROCAE WG78
                                                                        ‹#›
September 28, 2011
OPA Issues (Cont.)
8) There is no ATS function for ADS-C other than 4D TBO. Need
   to create new ATS function
    –    Need to have a delineation between small reports and large reports
        •    Large reports are only for a large number of waypoints in EPP


9) For large reports (128 waypoints), report size is unknown
    –    Temporarily used 20 KB to estimate aircraft/ACSP/ATSU delay 
         specification
        •    verification required by airframe/avionics manufacturers, ACSPs, and 
             ANSPs




CPDLC OSA - RTCA SC-214/EUROCAE WG78
                                                                                     ‹#›
September 28, 2011

				
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