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With regards to the priority of aeronautical messages, which of the following statements is correct?

  • A

    Messages relating to direction finding take precedence over meteorological messages.

  • B

    Flight safety messages take precedence over urgency messages.

  • C

    Flight regulatory messages take precedence over urgency messages.

  • D

A good aid to remember the order is: DUD-SMR. 

1. (D)istress 
2. (U)rgency 
3. (D)irection finding 
4. (S)afety 
5. (M)eteorological 
6. (R)egularity

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 of communications and the transmission of messages shall be in accordance with the following table (Message category and order of priority):

a) DISTRESS calls, distress messages and distress traffic 
b) URGENCY messages, including messages preceded by the medical transports signal 
c) Communications relating to DIRECTION FINDING 
d) FLIGHT SAFETY messages 
e) METEOROLOGICAL messages 
f) FLIGHT REGULARITY messages

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