Technical Provisions for Mode S Services and Extended Squitter

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CD-12 Technical Provisions for Mode S Services and Extended Squitter General example for the loading of data in register 40 16 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Hypothesis on information available to transponder The FMS selected altitude (calculated by the FMS) and the target altitude source information are available on aircraft buses (this is not necessarily the case today) as well as the MCP/FCU mode bits. Bits 48 and 54 are set to 1 all the time with this hypothesis. The reverse hypothesis would require bits 48–51 and bits 54–56 to be all set to 0 and the FMS selected altitude field to be all zeroed. Pilot selects ALT HOLD mode The autopilot holds the current aircraft altitude MCP/FCU selected altitude captured (ALT CAP) VNAV mode automatically disengaged ALT HOLD mode automatically selected New cleared flight level entered in MCP/FCU Selection of VNAV or equivalent mode where flight is controlled by FMS Pilot disengages autopilot and flights manual Intermediate FMS selected altitude capture and hold Draft Autopilot/flight director engaged Cleared flight level 1 (FL100) entered in MCP/FCU Holding last MCP/FCU selected altitude New FMS selected altitude FL 350 FL 300 Selected altitude calculated by the FMS in order to fulfil flight plan and best vertical profile FL 250 MCP/FCU Selected altitude = Cleared flight level FL 100 Aircraft flight path MCP/FCU selected altitude 100 300 300 300 300 300 300 FMS selected altitude 250 250 250 350 350 350 350 MCP/FCU mode bits Provided 1 1 1 1 1 1 1 VNAV 0 1 1 1 0 0 0 Alt hold 1 0 0 0 1 0 1 Approach 0 0 0 0 0 0 0 Figure D-2. General example for the loading of data in register 4016 Register 4016 content DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris FCU/MCP FMS FMS FCU/MCP FCU/MCP Unknown Altitude Target altitude (Unknown, Altitude, FCU/MCP, FMS) 1 2 3 4 5 6 7 Step
Appendix CD CD-13 CD.2.4.4.1.2 Possible uses of selected altitude and target altitude 1. MCP/FCU selected altitude will be downlinked as an additional read-back in order to check that the cleared flight level has been correctly understood and entered in the airborne system by the pilot. 2. Target altitude and associated mode of flight may be of interest to reduce the Short Term Conflict Alert false alarm rate. CD.2.4.4.1.3 Target altitude implementation difficulties It is recognized that all information to determine which altitude is the target altitude or which mode of flight is currently used may not always be available to the transponder in the current airborne implementation. In addition it may be very dependent on the platform. It is therefore preferable to set to 0 the corresponding bits of register 4016 rather than sending wrong information. CD.2.4.4.2 TRANSPONDER REGISTER NUMBER 4016 ON AIRBUS AIRCRAFT CD.2.4.4.2.1 Target altitude In order to clarify how aircraft intention information is reported in transponder register 4016 a mapping (Table CD-2) has been prepared to illustrate, for a number of conditions: a) how the altitude data are derived that are loaded into transponder register 4016, and b) how the corresponding source bits are set. CD.2.4.4.2.1.1 A330/A340 family Auto pilot or flight director status (AP on and FD on/off) or (AP off and FD on) DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Table CD-2. Transponder register number 4016 on Airbus A330/340 aircraft Auto pilot or flight director vertical mode Conditions: vertical status/altitude (FCU, FMS or aircraft) Target altitude used Bit 55 Bit 56 Draft Vertical speed (V/S) V/S > ( ( () A/C ALT / 0 0 V/S = 0 A/C ALT 0 1 FPA > ( ( () A/C ALT / 0 0 FPA = 0 A/C ALT 0 1 Aircraft operating with FCU altitude FCU ALT 1 0 Aircraft capturing a constrained altitude imposed by the FMS FMS ALT 1 1 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Appendix B B-3 TYPE code Subtype co
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Appendix B B-17 Coding (Binary) (De
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Appendix B B-19 a) ACAS operational
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Appendix B B-21 Subfield Coding: DR
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Appendix C C-5 Table C-2. “TYPE
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Appendix C C-11 C.2.3.2.2 Time Sync
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Msg Bit # “ME” Bit # Appendix C
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Technical Provisions for Mode S Services and Extended Squitter

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