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"OO-IMC, Lille Tower, number 2, turn right heading 050 for delaying action." What type of message is this?
  • A
    Flight regularity
  • B
    Urgency
  • C
    Direction finding
  • D
    Flight safety

Refer to figure.
ICAO Annex 10, Volume II
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.

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