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satisb the principle set out above. This should not militate
against use of the jlight number type of radio call sign by an
aircraft so equipped zf it wishes to apply this type of call sign,
but it is essential when a single code airborne equipment is
used in conjunction with ajlight number type radio call sign
that the ground stations be advised in connection with each
jlight of the SELCAL code available in the aircraft.
N o t e . The distress and urgency procedures contained in
5.3 relate to the use of radiotelephony. The provisions of
Article S30 and Appendix S13 of the ITU Radio Regulations
are generally applicable, except that S30.9 permits other
procedures to be employed where special arrangements
between governments exist, and are also applicable to
radiotelephony communications between aircraft stations and
stations in the maritime mobile service.
5.3.1.1 Distress and urgency traffic shall comprise all
radiotelephony messages relative to the distress and urgency
conditions respectively. Distress and urgency conditions are
defined as:
a) Distress: a condition of being threatened by serious andlor
imminent danger and of requiring immediate assistance.
b) Urgency: a condition concerning the safety of an aircraft
or other vehicle, or of some person on board or within
sight, but which does not require immediate assistance.
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
communication respectively.
5.3.1.2.1 At the commencement of any subsequent
communication in distress and urgency traffic, it shall be
permissible to use the radiotelephony distress and urgency
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.
N o t e . "Other stations" is intended to refer to any other
station which has received the distress or urgency message
and has become aware that it has not been acknowledged by
the station addressed.
5.3.1.5 Distress and urgency traffic shall normally be
maintained on the frequency on which such traffic was
initiated until it is considered that better assistance can be
provided by transferring that traffic to another frequency.
N o t e . 121.5 MHz or alternative available W F or HF
frequencies may be used as appropriate.
Chapter 5 Annex 10 - Aeronautical Telecommunications
5.3.1.6 In cases of distress and urgency communications,
in general, the transmissions by radiotelephony shall be made
slowly and distinctly, each word being clearly pronounced to
facilitate transcription.
5.3.2 Radiotelephony distress
communications
5.3.2.1 Action by the aircraft in distress
5.3.2.1.1 In addition to being preceded by the radiotelephony
distress signal MAYDAY (see 5.3.1.2), preferably
spoken three times, the distress message to be sent by an
aircraft in distress shall:
a) be on the air-ground frequency in use at the time;
b) consist of as many as possible of the following elements
spoken distinctly and, if possible, in the following order:
1)name of the station addressed (time and
circumstances permitting);
2) the identification of the aircraft;
3) the nature of the distress condition;
4) intention of the person in command;
5) present position, level (i.e. flight level, altitude, etc.,
as appropriate) and heading.
Note 1 .Th e foregoing provisions may be supplemented by
the following measures:
a) the distress message of an aircraft in distress being
made on the emergency frequency 121.5 MHz or another
aeronautical mobile frequency, Ef considered necessary
or desirable. Not all aeronautical stations maintain a
continuous guard on the emergency frequency;
b) the distress message of an aircraft in distress being
broadcast, tf time and circumstances make this course
preferable;
c) the aircraft transmitting on the maritime mobile service
radiotelephony calling frequencies;
d) the aircraft using any means at its disposal to attract
attention and make known its conditions (including the
activation of the appropriate SSR mode and code);
Note 2 .Th e station addressed will normally be that
station communicating with the aircraft or in whose area of
　
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