2.1.1. Mode A .............................................................................................. 2-4
2.1.2. Mode C .............................................................................................. 2-4
2.1.3. Mode S .............................................................................................. 2-4
2.1.3.1. Mode S Data Link................................................................................2-5
2.1.3.2. Elementary Surveillance (ELS) ..............................................................2-5
2.1.3.3. Enhanced Surveillance (EHS)................................................................2-5
2.1.3.4. Ground Initiated Comm B (GCIB) ..........................................................2-6
2.1.3.5. COMM A and COMM B..........................................................................2-6
2.1.3.6. 24-bit Address or Mode S Address .........................................................2-6
2.1.3.7. Automatic Dependent Surveillance – Broadcast (ADS-B)...........................2-6
2.1.3.8. Extended Squitter ...............................................................................2-7
2.1.3.9. 1090 Extended Squitter........................................................................2-7
2.1.4. Transponder Controls........................................................................ 2-8
2.2. Aircraft Identification and Position Reporting with ADS-B ................ 2-8
2.2.1. ADS-B Surveillance in Non-Radar Areas (ADS-B NRA).......................2-9
2.2.2. ADS-B surveillance in Radar Areas (ADS-B RAD)............................. 2-10
2.2.3. ADS-B Surveillance on Airport Surfaces (ADS-B APT)...................... 2-10
2.2.4. Generic Emergency Indicator .......................................................... 2-11
2.2.5. Discrete Emergency Codes .............................................................. 2-11
2.2.6. DO-260 and DO-260A ...................................................................... 2-11
2.2.7.
Geographical Filtering of SQWK Code.............................................. 2-12
2.2.8.
Version Number .............................................................................. 2-12
2.2.9.
Receiver Autonomous Integrity Monitoring (RAIM) / Fault Detection and Exclusion (FDE) ........................................................................ 2-12
2.2.10.
GPS Horizontal Figure of Merit (HFOM) ........................................... 2-13
2.2.11.
GPS Horizontal Protection Limit (HPL) ............................................ 2-13
2.2.12.
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