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(b) Purpose/nature code The purpose/nature code indicates the message type.
----------------------------------------| CODE | TYPE OF MESSAGE | ----------------------------------------| A | FLIGHT NUMBER | ----------------------------------------| B | AIRCRAFT REGISTRATION | ----------------------------------------| V | UPLINK | ----------------------------------------| W | DOWNLINK | ----------------------------------------| T | DABS/ASAS UPLINK | ----------------------------------------| N | NOT A RESPONSE | ----------------------------------------| K | ACKNOWLEDGMENT | ----------------------------------------| Q | BUSY | ----------------------------------------| D | DOCUMENTARY DATA | ----------------------------------------| E | ENGINE DATA | ----------------------------------------| F | FAILED MESSAGE | ----------------------------------------| Z | HF DOWNLINK "NO COMM" | ----------------------------------------| C | DATA BUS CHECK | ----------------------------------------| G | FUEL DATA | ----------------------------------------| L | LANDING DATA | ----------------------------------------| P | POSITION REPORT | ----------------------------------------| X | USER DEFINED | ----------------------------------------| S | STATUS | ----------------------------------------
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(c) Destination code
1_ For the uplink messages, the destination code indicates the
destination system (remote AOC peripheral).
----------------------------------------
| ORIGIN CODE | REMOTE AOC PERIPHERALS |
----------------------------------------
| A | FMGC1 |
----------------------------------------
| B | FMGC2 |
----------------------------------------
| Y | FMGC COM MASTER |
----------------------------------------
| F | CFDIU |
----------------------------------------
| 1 | CPMU |
----------------------------------------
| 2 | DIU |
----------------------------------------
| D | ACMS DMU |
----------------------------------------
2_ For the downlink messages, the destination code indicates the
air/ground medium of transmission.
There are four destination codes for the datalink messages:
G for ground policy
H for HF policy
S for Satcom policy
V for VHF policy.
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(d) Label codes The label code indicates the type of message.
----------------------------------------| LABEL | TYPE OF MESSAGE | ----------------------------------------| C1 | PRINTER MESSAGE | ----------------------------------------| H1 | REMOTE AOC | ----------------------------------------| RA | CREW MESSAGE | ----------------------------------------| RB DOWNLINK RESPONSE | ----------------------------------------| 00 | DOWNLINK EMERGENCY REPORT | ----------------------------------------| 20 | UPLINK AUTO INIT RESPONSE | ----------------------------------------| 3A | AOC ALERT | ----------------------------------------| 3B | AOC CALL | ----------------------------------------| 3M | AOC MESSAGE | ----------------------------------------| 3P | AOC PRINT | ----------------------------------------| 3W | WEATHER REPORT | ----------------------------------------| 5U | WEATHER REQUEST | ----------------------------------------| 54 | VOICE GO-AHEAD | ----------------------------------------| 80 | DOWNLINK REPORT | ----------------------------------------| 86 | DOWNLINK WEATHER REPORT | ----------------------------------------
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