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You receive the following instruction: "G-CD runway 27 cleared for take-off". The priority is…

  • A
    higher than “G-CD line up runway 27”
  • B
    the same as “G-CD leave control zone via November”
  • C
    the same as “G-CD request QDM”
  • D
    less than “G-CD taxi to holding point runway 27”

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 according 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


4.4.1.1.3 Flight safety messages (priority indicator FF) shall comprise:

a) movement and control messages as defined in PANS-ATM (Doc 4444), Chapter 11;

b) messages originated by an aircraft operating agency of immediate concern to aircraft in flight or preparing to depart;
c) meteorological messages restricted to SIGMET information, special air-reports, AIRMET messages, volcanic ash and tropical cyclone advisory information and amended forecasts.

In simple words, flight safety messages are ATC messages such as clearances and instructions.

  • With regards to this question, both instructions are clearances and, therefore, flight safety messages. Thus their priority is the same.

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