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available.
5.2.4.4 Establishment of communications
5.2.4.4.1 PANS.- When an aeronautical station initiates
a call by SELCAL, the aircraji replies with its mdio call sign,
followed by the phrase "GO AHEAD".
5.2.4.5 En-route procedures
5.2.4.5.1 PANS.- Aircmji stations should ensure that
the appropriate aeronautical station(s) are aware that
SELCAL watch is being established or maintained.
5.2.4.5.2 PANS.- When so prescribed on the basis of
regional air navigation agreements, calls for scheduled
reports from aircraji may be initiated by an aeronautical
station by means of SELCAL.
5.2.4.5.3 PANS.- Once SELCAL watch has been
established by a particular aircmji station, aeronautical
stations should employ SELCAL whenever they require to call
aircraji.
5.2.4.5.4 PANS.- In the event the SELCAL signal
remains unanswered afer two calls on the primary frequency
and two calls on the secondary frequency, the aeronautical
station should revert to voice calling.
5.2.4.5.5 PANS.- Stations in a network should keep
each other immediately advised when malfunctioning occurs
in a SELCAL installation on the ground or in the air. Likewise,
the aircrafr should ensure that the aeronautical stations
concerned with its flight are immediately made aware of any
malfirnctioning of its SELCAL installation, and that voice
calling is necessary.
5.2.4.5.6 PANS.- All stations should be advised when
the SELCAL installation is again functioning normally.
5.2.4.6 SELCAL code assignment
to aircraji
5.2.4.6.1 PANS.- In principle, the SELCAL code in the
aircraji should be associated with the radiotelephony call
sign, ie. where the flight number (service number) is employed
in the radio call sign, the SELCAL code in the aircmji should
be listed against the flight number. In all other cases, the
SELCAL code in the aircraft should be listed against the
aircrafr registration.
Note.- The use of aircraji mdio call signs, consisting of
the airline abbreviation followed by the flight service number.
is increasing among aircraji operators throughout the world.
The SELCAL equipment in aircmfr should, therefore, be of a
type which permits a particular code being associated with a
particular flight number, i.e, equipment which is capable of
adjustment in code combinations. At this stage, however, many
aircraft still carry SELCAL equipment of the single code type,
w11m
No. 80
Chapter 5 Annex 10 - Aeronautical Telecommunications
and it will not be possible for aircraji with such equipment to
satisfy the principle set out above. This should not militate
against use of the flight number type of mdio call sign by an
aircraji so equipped if it wishes to apply this type of call sign,
but it is essential when a single code airborne equipment is
used in conjunction with a flight number type radio call sign
that the ground stations be advised in connection with each
flight of the SELCAL code available in the aircraft.
53 Distress and urgency radiotelephony
communication procedures
5.3.1 General
Note.- 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 aircraji 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:
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.
Note.- 121.5 MHz or alternative available VHF or HF
frequencies may be used as appropriate.
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 aircrafi 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
　
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