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2.3 CATEGORIES OF MESSAGES
By convention, messages are placed into categories so that if several need to be

sent, the highest priority messages are sent first. This also applies to normal

radio communications; for example, an aircraft emergency call takes priority
over a request for landing. The messages have the following order of priority:

1) Distress. (MAYDAY)
A condition of being threatened by serious and/or imminent danger and of

requiring immediate assistance.

2) Urgency.(PAN PAN)

A condition concerning the safety of an aircraft etc but does not require

immediate assistance, including messages preceded by the medical
transports signal – PAN PAN MEDICAL

3) Direction Finding.
Communications relating to Direction Finding

4) Flight Safety.
Messages of immediate concern to an aircraft in flight. Meteorological

advice of immediate concern to aircraft in flight or about to depart. Other

messages to aircraft in flight or about to depart.

5) Meteorological Messages.

Reports, forecasts and warnings.

6) Flight Regularity

Messages regarding - operation or maintenance of facilities servicing changes in
requirements for passengers and crew non routine landings aircraft parts or materials

changes in aircraft operating schedules.

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