AMC1 ACNS.B.DLS.B1.070 CPDLC
uplink messages
ED Decision 2022/008/R
The data link system should comply with EUROCAE Document ED-110B, Section 2.2.3, and with the CPDLC message syntax in ICAO Doc 9705 (Edition 2), Section 2.1.4.
The data link system should prepare the appropriate response downlink message to a received uplink message in compliance with EUROCAE Document ED‑110B, Section 2.2.3.3, Table 2-4. Received uplink messages with the response type ‘A/N’ indicated in the ‘Response’ column should be responded to with either DM2 (STANDBY), DM4 (AFFIRM) or DM5 (NEGATIVE). Received uplink messages with the response type ‘R’ indicated in the ‘Response’ column should be responded to with either DM2 (STANDBY), DM3 (ROGER) or DM1 (UNABLE).
The aircraft data link system should also handle unsupported messages (i.e. uplink messages not referenced in CS ACNS.B.DLS.B1.050) as specified in EUROCAE Document ED-110B, Section 3.3.7.6.
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