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aircraft in distress shall:
a) be on the air-ground frequency in use at the time;
a) Distress: a condition of being threatened by serious andlor b) consist of as many as possible of the following elements
imminent danger and of requiring immediate assistance. spoken distinctly and, if possible, in the following order:
b) Urgency: a condition concerning the safety of an aircraft I) name of the station addressed (time and
or other vehicle, or of some person on board or within circumstances permitting);
sight, but which does not require immediate assistance.
2) the identification of the aircraft,
5.3.1.2 The radiotelephony distress signal MAYDAY and
the radiotelephony urgency signal PAN PAN shall be used at
the commencement of the first distress and urgency 3) the nature of the distress condition;
communication respectively.
4) intention of the person in command;
5.3.1.2.1 At the commencement of any subsequent
communication in distress and urgency traffic, it shall be 5) present position, level (i.e. flight level, altitude, etc.,
permissible to use the radiotelephony distress and urgency as appropriate) and heading.
signals.
5.3.1.3 The originator of messages addressed to an
aircraft in distress or urgency condition shall restrict to the
minimum the number and volume and content of such
messages as required by the condition.
5.3.1.4 If no acknowledgement of the distress or urgency
message is made by the station addressed by the aircraft, other
stations shall render assistance. as prescribed in 5.3.2.2 and
5.3.3.2 respectively.
Note.- "Other stations" is intended to refer to any other
station which has received the distress or urgency message
Note I.- The foregoing provisions may be supplemented
by the following measures:
a) the distress mqssage of an aircraji in distress being
made on the emergency frequency 121.5 MHz or
another aeronautical mobile frequency, if considered
necessary or desirable. Not all aeronautical stations
maintain a continuous guard on the emergency
frequency;
b) the distress message of an aircraji in distress being
broadcast, if time and circumstances m a l this course
preferable;
24/11/05
No. 80
Annex 10 - Aeronautical Telecommunications Volume 11
c) the aircraji transmitting on the maritime mobile service address these instructions "to all stations", or to one station
radiotelephony calling frequencies; only, according to circumstances. In either case, it shall use:
d) the aircraji using any means at its disposal to attract - STOP TRANSMllTlNG;
attention and make known its conditions (including the
activation of the appropriate SSR mode and code); - the radiotelephony distress signal MAYDAY.
e) any station taking any means at its disposal to assist an
aircraji in distress;
fi any variation on the elements listed under 5.3.2.1.1 b),
when the transmitting station is not itself in distress,
provided that such circumstance is clearly stated in the
distress message.
Note 2.- The station addressed will normally be t k t
station communicating with the aircraji or in whose area of
responsibility the aircraji is operating.
5.3.2.2 Action by the station addressed or first
station acknowledging the distress message
5.3.2.2.1 The station addressed by aircraft in distress, or
fust station acknowledging the distress message, shall:
5.3.2.3.2 The use of the signals specified in 5.3.2.3.1 shall
be reserved for the aircraft station in distress and for the
station controlling the distress traffic.
5.3.2.4 Action by all other stations
5.3.2.4.1 The distress communications have absolute
priority over all other communications, and a station aware of
them shall not transmit on the frequency concerned, unless:
a) the distress is cancelled or the distress traffic is
terminated;
b) all distress traffic has been transferred to other
frequencies;
c) the station controlling communications gives permission;
a) immediately acknowledge the distress message; d) it has itself to render assistance.
b) take control of the communications or specifically and 5.3.2.4.2 Any station which has knowledge of distress
clearly transfer that responsibility, advising the aircraft trafic, and which cannot itself assist the station in distress,
if a transfer is made; shall nevertheless continue listening to such traffic until it is
evident that assistance is being provided.
c) take immediate action to ensure that all necessary
information is made available, as soon as possible, to:
1) the ATS unit concerned; 5.3.2.5 Termination of distress communications
and of silence
2) the aircraft operating agency concerned, or its
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