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5.1.1 In all communications the highest standard of 5.1.6 When an aeronautical station is called simultaneously
discipline shall be observed at all times. by several aircraft stations, the aeronautical station shall decide
the order in which aircraft shall communicate.
5.1.1.1 ICAO standardized phraseology shall be used in all
situations for which it has been specified. Only when
standardized phraseology cannot serve an intended transmission,
plain language shall be used.
N o t e . Detailed language proficiency requirements appear
in the Appendix to Annex 1.
5.1.1.2 The transmission of messages, other than those
specified in 5.1.8, on aeronautical mobile frequencies when
the aeronautical fixed services are able to serve the intended
purpose, shall be avoided.
5.1.1.3 Recommendation.- In all communications, the
consequences of human performance which could affect the
accurate reception and comprehension of messages should be
taken into consideration.
5.1.7 In communications between aircraft stations, the
duration of communication shall be controlled by the aircraft
station whch is receiving, subject to the intervention of an
aeronautical station. If such communications take place on an
ATS frequency, prior permission of the aeronautical station
shall be obtained. Such requests for permission are not
required for brief exchanges.
5.1.8 Categories of messages
The categories of messages handled by the aeronautical mobile
service and the order of priority in the establishment of
communications and the transmission of messages shall be in
accordance with the following table.
N o t e . Guidance material on human performance can be Message category and Radiotelephony
found in the Human Factors Training Manual (Doc 9683). order of priority signal
5.1.2 Where it is necessary for an aircraft station to send
signals for testing or adjustment which are liable to interfere
with the working of a neighbouring aeronautical station, the
consent of the station shall be obtained before such signals are
sent. Such transmissions shall be kept to a minimum.
5.1.3 When it is necessary for a station in the aeronautical
mobile service to make test signals, either for the adjustment
of a transmitter before making a call or for the adjustment of
a receiver, such signals shall not continue for more than 10
seconds and shall be composed of spoken numerals (ONE,
TWO, THREE, etc.) in radiotelephony, followed by the radio
call sign of the station transmitting the test signals. Such
transmissions shall be kept to a minimum.
5.1.4 Except as otherwise provided, the responsibility of
establishing communication shall rest with the station having
traffic to transmit.
N o t e . In certain cases when SELCAL is used the
procedures respecting the establishment of communications
are contained in 5.2.4.
a) Distress calls, distress messages
and distress traffic MAYDAY
b) Urgency messages, including PAN, PAN
messages preceded by the or PAN, PAN
medical transports signal MEDICAL
c) Communications relating to
direction finding -
d) Flight safety messages
e) Meteorological messages -
f) Flight regularity messages -
Note I . Messages concerning acts of unlawful interference
constitute a case of exceptional circumstances which
may preclude the use of recognized communication procedures
used to determine message category and priority.
ANNEX 10 - VOLUME I1
Annex 10 - Aeronautical Telecommunications Volume I1
Note 2 .A NOTM may qualzfi for any of the categories
or priorities c) ton inclusive. The decision as to which priority
will depend on the contents of the NOTM and its importance
to the aircraft concerned.
5.1.8.1 Distress messages and distress traffic shall be
handled in accordance with the provisions of 5.3.
5.1.8.2 Urgency messages and urgency traffic, including
messages preceded by the medical transports signal, shall be
handled in accordance with the provisions of 5.3.
N o t e . The term "medical transports" is defined in the
1949 Geneva Conventions and Additional Protocols (see also
RR S33 Section III) and refers to "any means of transportation
by land, water, or aiu; whether military or civilian, permanent
or temporary, assigned exclusively to medical transportation
and under the control of a competent authority of a Party to
the conflict".
5.1.8.3 Communications relating to direction finding shall
be handled in accordance with Chapter 6.
5.1.8.4 Flight safety messages shall comprise the
following:
1) movement and control messages [see PANS-ATM
(Doc 4444)l;
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