Minimum Aviation System Performance Standards for Aircraft ...

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84 3.2.24 Selected Heading Field © 20xx, RTCA, Inc. a. The “Selected Heading” is an 8-bit field that shall (242AR3.139-A) contain Selected Heading data encoded in accordance with Table 3.2.24. b. Encoding of Selected Heading data shall (242AR3.139-B) be rounded so as to preserve accuracy of the source data within ±½ LSB. c. Whenever there is NO valid Selected Heading data available, then the Selected Heading Status, Sign, and Data subfields shall (242AR3.139-C) be set to ZERO (0) as indicated in Table 3.2.24. Note: On many airplanes, the ADS-B Transmitting Subsystem receives Selected Heading from a Mode Control Panel / Flight Control Unit (MCP / FCU). Users of this data are cautioned that the Selected Heading value transmitted by the ADS-B Transmitting Subsystem does not necessarily reflect the true intention of the airplane during certain flight modes (e.g., during LNAV mode). Table 3.2.24: Selected Heading Status, Sign and Data Field Values Values for Selected Heading: Status Sign Data Meaning 0 0 0000 0000 NO Data or INVALID Data 1 0 0000 0000 0.0 degrees 1 0 0000 0001 0.703125 degrees 1 0 0000 0010 1.406250 degrees * * **** **** **** **** **** * * **** **** **** **** **** * * **** **** **** **** **** 1 0 1111 1111 179.296875 degrees 1 1 0000 0000 180.0 or -180.0 degrees 1 1 0000 0001 180.703125 or -179.296875 degrees 1 1 0000 0010 181.406250 or -178.593750 degrees * * **** **** **** **** **** * * **** **** **** **** **** * * **** **** **** **** **** 1 1 1000 0000 270.000 or -90.0000 degrees 1 1 1000 0001 270.703125 or -89.296875 degrees 1 1 1000 0010 271.406250 or -88.593750 degrees 1 1 1111 1110 358.593750 or -1.4062500 degrees 1 1 1111 1111 359.296875 or -0.7031250 degrees 3.2.25 Status of MCP/FCU Mode Bits The “Status of MCP / FCU Mode Bits” is a 1-bit field that shall (242AR3.140-A) be used to indicate whether the mode indicator bits are actively being populated (e.g., set) in accordance with Table 3.2.25. If information is provided to the ADS-B Transmitting Subsystem to set the Mode Indicator bits to either “0” or “1,” then the “Status of MCP/FCU Mode Bits” shall
(242AR3.140-B) be set to ONE (1). Otherwise, the “Status of MCP/FCU Mode Bits” shall (242AR3.140-C) be set to ZERO (0). Table 3.2.25: Status of MCP/FCU Mode Bits Field Values Values Meaning 0 No Mode Information is being provided in the Mode Indicator bits Mode Information is deliberately being provided in the Mode 1 Indicator bits 3.2.26 Mode Indicator: Autopilot Engaged Field The “Mode Indicator: Autopilot Engaged” subfield is a 1-bit field that shall (242AR3.142-A) be used to indicate whether the autopilot system is engaged or not. a. The ADS-B Transmitting Subsystem shall (242AR3.142-B) accept information from an appropriate interface that indicates whether or not the Autopilot is engaged. b. The ADS-B Transmitting Subsystem shall (242AR3.142-C) set the Mode Indicator: Autopilot Engaged field in accordance with Table 3.2.26. Table 3.2.26: Mode Indicator: Autopilot Engaged Field Values Values Meaning Autopilot is NOT Engaged or Unknown (e.g., not actively coupled and flying 0 the aircraft) 1 Autopilot is Engaged (e.g., actively coupled and flying the aircraft) 3.2.27 Mode Indicator: VNAV Mode Engaged Field The “Mode Indicator: VNAV Mode Engaged” is a 1-bit field that shall (242AR3.146-A) be used to indicate whether the Vertical Navigation Mode is active or not. a. The ADS-B Transmitting Subsystem shall (242AR3.146-B) accept information from an appropriate interface that indicates whether or not the Vertical Navigation Mode is active. b. The ADS-B Transmitting Subsystem shall (242AR3.146-C) set the Mode Indicator: VNAV Mode Engaged field in accordance with Table 3.2.27. Table 3.2.27: “Mode Indicator: VNAV Engaged” Field Values Values Meaning 0 VNAV Mode is NOT Active or Unknown 1 VNAV Mode is Active 3.2.28 Mode Indicator: Altitude Hold Mode Field The “Mode Indicator: Altitude Hold Mode” is a 1-bit field that shall (242AR3.147-A) be used to indicate whether the Altitude Hold Mode is active or not. © 20xx, RTCA, Inc. 85
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FOREWORD This document was prepared
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TABLE OF CONTENTS 1 PURPOSE AND SCO
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3.3.23 Selected Heading Sign Field.
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LIST OF TABLES Table 2-5: High Leve
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2 © 20xx, RTCA, Inc. C: Derivation
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4 1.2.3 ASA Architecture © 20xx, R
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6 © 20xx, RTCA, Inc. The TCAS traf
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8 © 20xx, RTCA, Inc. DO-3xx ADS-B
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10 1.3.1.4 Basic Surface Situationa
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12 2 Operational Requirements 2.1 G
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14 © 20xx, RTCA, Inc. timeliness,
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16 © 20xx, RTCA, Inc. Table 2-6: R
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18 2. FAA TSO-C195 states applicati
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20 © 20xx, RTCA, Inc. Notes for Ta
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22 © 20xx, RTCA, Inc. • Optimiza
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24 © 20xx, RTCA, Inc. same approac
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26 © 20xx, RTCA, Inc. may allow de
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28 © 20xx, RTCA, Inc. An aircraft
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30 Information ↓ Initial Acquisit
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32 © 20xx, RTCA, Inc. NRA - 3 NM E
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Page 50 and 51: 38 © 20xx, RTCA, Inc. In Figure 3.
Page 52 and 53: 40 © 20xx, RTCA, Inc. Figure 3.1.1
Page 54 and 55: 42 3.1.1.1.3 Functional Level © 20
Page 58 and 59: 46 © 20xx, RTCA, Inc. Table 3.1.1.
Page 62 and 63: 50 © 20xx, RTCA, Inc. Figure 3-8 i
Page 64 and 65: 52 USER AIR INTERFACE © 20xx, RTCA
Page 66 and 67: 54 3.1.4.2.1.4 ADS-R in Enroute and
Page 68 and 69: 56 TIS‐B Non‐Equipped © 20xx,
Page 70 and 71: 58 © 20xx, RTCA, Inc. available fo
Page 72 and 73: 60 3.2.2 Identification 3.2.2.1 Cal
Page 74 and 75: 62 © 20xx, RTCA, Inc. i. Lighter-t
Page 76 and 77: 64 © 20xx, RTCA, Inc. The ADS-B po
Page 78 and 79: 66 3.2.4.2 Altitude © 20xx, RTCA,
Page 80 and 81: 68 3.2.7 Heading © 20xx, RTCA, Inc
Page 82 and 83: 70 3.2.8.7 Other Capability Codes
Page 84 and 85: 72 SDA Value (decimal) (binary) 0 0
Page 86 and 87: 74 © 20xx, RTCA, Inc. Table 3.2.9.
Page 88 and 89: 76 © 20xx, RTCA, Inc. 5. RC < 0.3
Page 90 and 91: 78 © 20xx, RTCA, Inc. Table 3.2.12
Page 92 and 93: 80 3.2.16 Geometric Vertical Accura
Page 94 and 95: 82 © 20xx, RTCA, Inc. Note: Users
Page 98 and 99: 86 © 20xx, RTCA, Inc. a. The ADS-B
Page 100 and 101: 88 3.4.1.1 Definitions © 20xx, RTC
Page 102 and 103: 90 Source Info Category Information
Page 104 and 105: 92 © 20xx, RTCA, Inc. 5. Required
Page 106 and 107: 94 © 20xx, RTCA, Inc. ASSAP shall
Page 108 and 109: 96 3.4.2.2 Latency 3.4.2.3 Integrit
Page 110 and 111: 98 3.4.2.11 Suitability of Traffic
Page 112 and 113: 100 3.4.3.1 ADS-B Surveillance Cove
Page 114 and 115: 102 © 20xx, RTCA, Inc. required to
Page 116 and 117: 104 Equipage Class ↓ B0 Aircraft
Page 118 and 119: © 20xx, RTCA, Inc. Table 3.4.3.3.1
Page 120 and 121: © 20xx, RTCA, Inc. Notes for Table
Page 122 and 123: Operational Domain → © 20xx, RTC
Page 124 and 125: © 20xx, RTCA, Inc. 2. Future versi
Page 126 and 127: © 20xx, RTCA, Inc. • Report time
Page 128 and 129: 3.5.1.2 ADS-B Message Exchange Tech
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Page 132 and 133: © 20xx, RTCA, Inc. • Ground Spee
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Page 136 and 137: 3.5.1.3.12 Heading While on the Sur
Page 138 and 139: 3.5.1.4 Mode Status Report © 20xx,
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Page 142 and 143: 3.5.1.4.9 Capability Class (CC) Cod
Page 144 and 145: 3.5.1.4.15 Geometric Vertical Accur
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3.5.1.6.2 ARV Report Update Require
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© 20xx, RTCA, Inc. The higher “s
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© 20xx, RTCA, Inc. Whereas ADS-B r
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4 ADS-B IN System Applications Requ
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© 20xx, RTCA, Inc. Broadcast (ADS-
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© 20xx, RTCA, Inc. This Page Inten
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Appendix A Page A-2 ©20xx, RTCA, I
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Appendix A Page A-8 A.2 Definitions
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Appendix A Page A-10 Air/Ground Sta
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Appendix A Page A-12 Collision Avoi
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Appendix A Page A-14 Extended Displ
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Appendix A Page A-16 Latency Compen
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Appendix A Page A-18 Regime - Divis
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Appendix A Page A-20 TCAS Potential
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Appendix B Bibliography
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B Bibliography Appendix B Page B-1
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Appendix B Page B-3 Name Reference
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