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An aircraft’s call sign is RUSHAIR 123. In the cruise, the pilots receive the CPDLC message "CLIMB TO FL410". A few seconds later, they receive the following radio transmission: "RUSHAIR 123 DISREGARD CPDLC CLIMB MESSAGE, BREAK, CLIMB FLIGHT LEVEL 380." What should they do?

  • A

    Disregard the CPDLC instruction, read back the radio transmission and climb to FL380.

  • B
    Disregard the voice transmission, read back the radio transmission and climb to FL410.
  • C
    Send "STANDBY" via a CPDLC message and wait for further instructions.
  • D
    Send "WILCO" via CPDLC and climb to FL410.
Voice instructions and acknowledgments shall have precedence over CPDLC messages at all times. In the event that any ambiguity exists in a message or message exchange, then the controller/pilot shall revert to voice communications for clarification. Therefore, in this case, the pilots should follow the voice communication instructions and disregard the CPDLC instruction.

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