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Flight regularity messages include the messages...

  • A

    concerning the operation or maintenance of facilities essential for the safety or regularity of aircraft operation.

  • B

    concerning aircraft and their passengers which face a grave and imminent threat and require immediate assistance.

  • C

    concerning the safety of an aircraft, a watercraft or some other vehicle or person in sight.

  • D

    sent by an aircraft operating agency or an aircraft of immediate concern to an aircraft in flight.

ICAO Annex 10 Volume II
5.1.8 Categories of messages

5.1.8.6 Flight regularity messages shall comprise the following:

1) messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation;

2) messages concerning the servicing of aircraft;

3) instructions to aircraft operating agency representatives concerning changes in requirements for passengers and crew caused by unavoidable deviations from normal operating schedules. Individual requirements of passengers or crew shall not be admissible in this type of message;

4) messages concerning non-routine landings to be made by the aircraft;

5) messages concerning aircraft parts and materials urgently required;

6) messages concerning changes in aircraft operating schedules.

Flight regularity messages → maintenance of facilities, servicing, schedule changes

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