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When an aircraft fails to establish contact on the designated frequency, on which other frequency should the first attempt to re-establish communications be made?
  • A
    On 121.5 MHz.
  • B
    On the FIR Search And Rescue frequency.
  • C
    On the appropriate UHF emergency frequency.
  • D
    On the previous frequency used.

ICAO ANNEX 10
VOLUME II

5.2.2.7. Communications failure
5.2.2.7.1.1. When an aircraft station fails to establish contact with the aeronautical station on the designated frequency, it shall attempt to establish contact on another frequency appropriate to the route. If this attempt fails, the aircraft station shall attempt to establish communication with other aircraft or other aeronautical stations on frequencies appropriate to the route. In addition, an aircraft operating within a network shall monitor the appropriate VHF frequency for calls from nearby aircraft.
5.2.2.7.1.2. If attempts specified under 5.2.2.7.1.1. fail, the aircraft shall transmit its message twice on the designated frequency(ies), preceded by the phrase “TRANSMITTING BLIND” and, if necessary, include the addressee(s) for which message is intended.

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