Technical Provisions for Mode S Services and Extended Squitter

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C-28 Technical Provisions for Mode S Services and Extended Squitter Coding (“ME” Bit 50) Table C-19. “Altitude Hold Mode” Subfield Encoding 0 Altitude Hold Mode is NOT Active 1 Altitude Hold Mode is Active Meaning C.2.3.9.16 Reserved for ADS-R Flag The “Reserved for ADS-R Flag” subfield in the Target State and Status Message is a 1-bit (“ME” bit 51, Message bit 83) field that shall be used to specify the rebroadcast of a 1090 MHz ADS-B Message received by a ground station on an alternate ADS-B data link, as indicated in §C.4.4.6. C.2.3.9.17 Approach Mode The “Approach Mode” subfield is a 1-bit (“ME” bit 52, Message bit 84) field that shall be used to indicate whether the Approach Mode is active or not. a. The ADS-B Transmitting Subsystem shall accept information from an appropriate interface that indicates whether or not the Approach Mode is active. b. The ADS-B Transmitting Subsystem shall set “ME” bit 52 (Message bit 84) in accordance with Table C-20. Coding (“ME” Bit 52) Table C-20. “Approach Mode” Subfield Encoding 0 Approach Mode is NOT Active 1 Approach Mode is Active Meaning C.2.3.9.18 TCAS/ACAS Operational Draft The “TCAS/ACAS Operational” subfield is a 1-bit (“ME” bit 53, Message bit 85) field that shall be used to indicate whether the TCAS/ACAS System is Operational or not. a. The ADS-B Transmitting Subsystem shall accept information from an appropriate interface that indicates whether or not the TCAS/ACAS System is Operational. b. The ADS-B Transmitting Subsystem shall set “ME” bit 53 (Message bit 85) in accordance with Table C-21. Notes. — DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Coding (“ME” Bit 53) Table C-21. “TCAS/ACAS Operational” Subfield Encoding Meaning 0 TCAS/ACAS System is NOT Operational (Any time RI ≠ 3 or 4) 1 TCAS/ACAS System IS Operational (RI = 3 or 4) 1. ADS-B does not consider TCAS Operational equal to ONE (1) unless the TCAS is in a state which can issue an RA (e.g., RI=3 or 4). DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Appendix C C-29 2. As a reference point, RTCA DO-181D (EUROCAE ED-73C) Mode-S Transponders consider that the TCAS/ACAS System is operational when “MB” bit 16 of Register 1016 is set to “ONE” (1). This occurs when the transponder / TCAS/ACAS interface is operational and the transponder is receiving TCAS/ACAS RI=2, 3 or 4. (Refer to RTCA DO-181D (EUROCAE ED-73C), Appendix B, Table B-3-16.) RI=0 is STANDBY, RI=2 is TA ONLY and RI=3 is TA/RA. C.2.3.9.19 LNAV Mode Engaged The “LNAV Mode Engaged” subfield is a 1-bit (“ME” bit 54, Message bit 86) field that is used to indicate whether the Lateral Navigation Mode is active or not. a. The ADS-B Transmitting Subsystem accepts information from an appropriate interface that indicates whether or not the Lateral Navigation Mode is active. b. The ADS-B Transmitting Subsystem sets the “ME” bit 54 (Message bit 86) in accordance with Table C-22. Coding (“ME” Bit 54) Table C-22. “LNAV” Mode Engaged” Subfield Encoding Meaning 0 LNAV Mode is NOT Active or Unknown 1 LNAV Mode is Active C.2.3.10 AIRCRAFT OPERATIONAL STATUS MESSAGE Register 6516 contains an exact bit-for-bit duplicate of the Aircraft Operational Status Message Extended Squitter (TYPE=31 and Subtype=0/1). The contents of the Aircraft Operational Status Message shall be formatted as specified Figure C-10, and described in the following paragraphs. C.2.3.10.1 Transmission Rate The rate at which the ADS-B Aircraft Operational Status Messages (TYPE=31 and Subtype=0/1) are broadcast is given for various conditions in the following subparagraphs. A summary of the transmission rates for all extended squitters is shown in Table C-35. Draft a. Airborne Aircraft Operational Status Messages (TYPE=31, Subtype=0) shall be broadcast at the rates given in the following subparagraphs when aircraft operational status information is valid and when in the airborne state; (1). No Change in TCAS RA Active/NAC P/SIL/NIC SUPP Data: If there has been no change in the TCAS RA Active, NACP, SIL or NICSUPP information provided in the Airborne Aircraft Operational Status Message (TYPE=31, Subtype=0), then the messages shall be broadcast at random intervals that are uniformly distributed over the range of 2.4 to 2.6 seconds relative to the previous Airborne Aircraft Operational Status Message for as long as data is available to satisfy the requirements of subparagraph “a.” above. (2). Change in TCAS RA Active/NAC P/SIL/NIC SUPP Data with Target State and Status: If there has been a change in the TCAS RA Active, NAC P, SIL or NIC SUPP information provided in the Airborne Aircraft Operational Status Message (TYPE=31, Subtype=0), and Target State and Status Messages are being broadcast, then the Airborne Aircraft Operational Status Messages (TYPE=31, Subtype=0) shall be broadcast at random intervals that are uniformly distributed over the range of 2.4 to 2.6 seconds relative to the previous Airborne Aircraft Operational Status Message for as long as data is available to satisfy the requirements of subparagraph “a.” above. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Appendix A A-7 TYPE Code Format Hor
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Appendix A A-13 The supersonic vers
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Appendix A A-15 The transponder sha
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Appendix A A-97 a) the PI sends a T
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Appendix A A-99 This subfield shall
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Appendix A A-101 These channels hav
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Appendix A A-109 A.4. MODE S BROADC
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Appendix A A-111 Note 1.— This st
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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 B B-23 Coding (Binary) (De
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Appendix CD CD-3 ACTIONS EVENTS DRA
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Appendix CD CD-7 too many broadcast
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Appendix CD CD-13 CD.2.4.4.1.2 Poss
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Appendix CD CD-15 D.2.4.4.2.1.2 A32
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Appendix CD CD-17 AP/FD mode V/S-FP
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Appendix CD CD-23 CD.2.4.7.5 BINARY
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Appendix DE DE-7 c. for GNSS, the p
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Technical Provisions for Mode S Services and Extended Squitter

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