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R  message fields: 
R  -------------------------------------------------------------------------------
R  | DESIGNATOR |  FIELD  |  INDICATION  | 
R  -------------------------------------------------------------------------------
R  |  AA  | address  | contains the A/C mode S address  | 
R  |  | announced  |  | 
R  |  |  |  | 
R  |  AC  | altitude  | information containing the A/C altitude  | 
R  |  | code  |  | 
R  |  |  |  | 
R  |  AP  | address  | 24-bit address and parity overlaid  | 
R  |  | parity  |  | 
R  |  |  |  | 
R  |  CA  | transponder  | reports transponder capability  | 
R  |  | capability  |  | 
R  |  |  |  | 
R  |  DR  | downlink  | requests extraction of downlink messages from | 
R  |  | request  | the transponder by the interrogator  | 
R  |  |  |  | 
R  |  FS  | flight  | flight status  | 
R  |  | status  |  | 
R  |  |  |  | 
R  |  ID  | identification | contains the Mode A identification code  | 
R  |  |  |  | 
R  |  MB  | message  | 56-bit MB field contains the message  | 
R  |  | Comm B  | transmitted to the interrogator  | 
R  |  |  |  | 
R  |  MD  | message  | 80-bit MD field contains one segment of a  | 
R  |  | Comm D  | sequence of segments in the ELM Mode  | 
R  -------------------------------------------------------------------------------
R  (c) Data transmitted for elementary surveillance 
R  The specific data related to the elementary surveillance are the 
R  following: 
R  - 24 bits A/C adress (coded in AA field of DF11) 
R  - flight number (MB field of DF20 or DF21 filled in with Binary 
R  Data Stores (BDS) 2.0 
R  - transponder capability report (coded in CA field of DF11) 
R  - altitude/ground reporting (coded in AC field of DF4 or DF20) 
R  - flight status (coded in FS field of DF4) 
R  - RA report (MB field of DF20 or DF21 filled in with BDS 3.0) 
R  - Surveillance Identifier (SI) (coded in PI field of DF11) 

R 1EFF : 051-099, 1 34-52-00Page 50 1 1 May 01/05 1 1 1CES 1

R  (d) Data transmitted for enhanced surveillance (if modification 32467 
R  is validated) 
R  The specific data related to the enhanced surveillance are the 
R  following: 
R  - selected altitude 
R  - barometric pressure setting 
R  - roll angle 
R  - track angle rate 
R  - true track angle 
R  - ground speed 
R  - true air speed 
R  - magnetic heading 
R  - indicated airspeed 
R  - mach 
R  - barometric altitude rate 
R  - inertial vertical velocity 
R  These data are transmitted in MB field of BDS 4.0, 5.0 or 6.0 in 
R  DF20 or DF21. 
R  (e) Data transmitted in extended squitters (if modification 32467 is 
R  validated) 
R  The specific data related to the extended squitters are the 
R  following: 
R  - altitude 
R  - longitude 
R  - latitude 
R  - movement 
R  - ground track 
R  - flight number 
R  - E/W velocity 
R  - N/S velocity 
R  - vertical rate 
R  These data are transmitted in ME field of BDS 0.5, 0.6, 0.8 or 
R  0.9 in DF17. 
R  (4) Operation 
R  (Ref. Fig. 006A) 
R  The transponder consists of a receiver, a transmitter, an 
R  interface/Central Processing Unit (CPU) assembly and a power 
R  supply/modulator assembly. 
R  (a) Receiver 
R  The receiver (top and bottom receiver channels), which consists 
R  of a ceramic pre-selector filter, self-test coupler, low noise 
　
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