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If two-way communication with Air Traffic Services is lost, the aircraft will be instructed to acknowledge by making a specified manoeuvre, or to make SSR code and/or ADS-B transmission changes. What other instructions could the aircraft receive to determine whether the receiver is functioning or not?
  • A
    To operate altimeter reference changes.
  • B
    To operate IDENT.
  • C
    To operate the aircraft lights.
  • D
    To contact the Air Traffic Services unit by phone.

ICAO Doc 4444
8.8.3 Failure of equipment

8.8.3.1 AIRCRAFT RADIO TRANSMITTER FAILURE
8.8.3.1.1 If two-way communication is lost with an aircraft, the controller should determine whether or not the aircraft’s receiver is functioning by instructing the aircraft on the channel so far used to acknowledge by making a specified manoeuvre and by observing the aircraft’s track, or by instructing the aircraft to operate IDENT or to make SSR code and/or ADS-B transmission changes.

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