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A message used for air traffic control is categorized as a...

  • A

    flight regularity message.

  • B

    message related to direction finding.

  • C

    flight safety message.

  • D

    meteorological message.

ICAO Annex 10 Volume II
CHAPTER 5. AERONAUTICAL MOBILE SERVICE — VOICE COMMUNICATIONS

5.1.8.4 Flight safety messages shall comprise the following:

1) movement and control messages [see the PANS-ATM (Doc 4444)];

(...)

ICAO Doc 4444
11.1.3 Movement and control messages

e) control messages (FF), including:

— clearance messages
— flow control messages
— position-report and air-report messages.

Flight safety messages → air traffic control, SIGMET, AIRMET
Flight regularity messages → maintenance of facilities, servicing, schedule changes
Meteorological messages → forecasts, observations and reports (TAF, METAR, SPECI)
Messages related to direction finding → finding the direction of an aircraft in flight

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