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According to ICAO Annex 10, Aeronautical Telecommunications, which air-ground message has the highest priority?
  • A
    Flight safety message
  • B
    Emergency message
  • C
    Distress message
  • D
    Urgency message

ICAO Annex 10 Volume II
5.1.8 Categories of messages

The categories of messages handled by the aeronautical mobile service and the order of priority in the establishment communications and the transmission of messages shall be in accordance with the following table.

Message category and order of priority signalRadiotelephony signal
  1. Distress calls, distress messages and distress traffic
MAYDAY
  1. Urgency messages, including messages preceded by the medical transports signal
PAN, PAN or PAN, PAN MEDICAL
  1. Communications relating to direction finding
___
  1. Flight safety messages
___
  1. Meteorological messages
___
  1. Flight regularity messages
___

Note 1: Messages concerning acts of unlawful interference constitute a case of exceptional circumstances which may preclude the use of recognized communication procedures used to determine message category and priority.

Note 2: A NOTAM may qualify for any of the categories or priorities c) to f) inclusive. The decision as to which priority will depend on the contents of the NOTAM and its importance to the aircraft concerned.

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