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On which frequency should a distress message be transmitted at first?

  • A

    Current frequency.

  • B

    FIS frequency.

  • C

    Emergency frequency.

  • D

    Radar frequency.

Refer to figure.
ICAO Annex 10 Volume II
5.3 DISTRESS AND URGENCY RADIOTELEPHONY COMMUNICATION PROCEDURES

5.3.1.1 Distress and urgency traffic shall comprise all radiotelephony messages relative to the distress and urgency conditions respectively. Distress and urgency conditions are defined as:

a) Distress: a condition of being threatened by serious and/or imminent danger and of requiring immediate assistance.

b) Urgency: a condition concerning the safety of an aircraft or other vehicle, or of some person on board or within sight, but which does not require immediate assistance.

5.3.1.5 Distress and urgency traffic shall normally be maintained on the frequency on which such traffic was initiated until it is considered that better assistance can be provided by transferring that traffic to another frequency.

Distress → immediate assistance required (MAYDAY)
Urgency → no immediate assistance required (PAN PAN)

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