Communicationshard#1287
CPDLC message types include:
A
Clearances, information, requests, and reports in standardized text format
CorrectB
Voice messages only
C
Radar returns
D
TCAS advisories
Explanation
CPDLC supports uplink messages (ATC to pilot: clearances, instructions, information) and downlink messages (pilot to ATC: requests, reports).
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