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b) ensure that the HF aeronautical station has the correct
SELCAL code information by establishing communications
temporarily with the HF aeronautical station
while still within W F coverage.
N o t e . Provisions regarding completion of the flight plan
are set forth in the PANS-ATM (Doc 4444).
5.2.4.3 Pre-flight check
5.2.4.3.1 PANS.- The aircraft station should contact the
appropriate aeronautical station and request a pre-flight
SELCAL check and, zf necessary, give its SELCAL code.
5.2.4.3.2 PANS.- When primary and secondary
frequencies are assigned, a SELCAL check should normally be
5'2'4' PANS'- mth the system madejirst on the secondaryfrequency and then on the primary
known as SELCAL, the voice calling is replaced by the trans- frequency. The aircraft station would then be ready for
mission of coded tones to the aircraft over the radiotelephony continued communication on the primary frequency.
channels. A single selective call consists of a combination of
four pre-selected audio tones whose transmission requires 5.2.4.3.3 PANS.- Should the pre-flight check reveal that
approximately 2 seconds. The tones are generated in the either the ground or airborne SELCAL installation is
aeronautical station coder and are received by a decoder inoperative, the aircraft should maintain a continuous listening
connected to the audio output of the airborne receiver. Receipt watch on its subsequent flight until SELCAL again becomes
of the assigned tone code (SELCAL code) activates a cockpit
available.
call system in the form of light and/or chime signals.
N o t e . Due to the limited number of SELCAL codes,
similar code assignments to multiple aircraft may be expected. 5.2.4.4 of
Therefore, the use of correct radiotelephony (RTFj procedures
contained in this chapter is emphasized when establishing 5.2.4.4.1 PANS.- When an aeronautical station initiates
communications via SELCAL. a call by SELCAL, the aircraft replies with its radio call sign,
followed by the phrase "GO AHEAD".
5.2.4.1.2 PANS.- SELCAL should be utilized by suitably
equipped stations for ground-to-air selective calling on the
en-route HF and W F radio channels. 5.2.4.5 En-route procedures
5.2.4.1.3 PANS.- On aircraft equipped with SELCAL, 5.2.4.5.1 PANS.- Aircraft stations should ensure that
the pilot is still able to keep a conventional listening watch zf the appropriate aeronautical station(s) are aware that
required. SELCAL watch is being established or maintained.
Annex 10 - Aeronautical Telecomrmtnications Volume I1
5.2.4.5.2 PANS.- When so prescribed on the basis of 5.3 Distress and urgency radiotelephony
regional air navigation agreements, calls for scheduled reports communication procedures
from aircraft may be initiated by an aeronautical station by
means of SELCAL.
5.3.1 General
5.2.4.5.3 PANS.- Once SELCAL watch has been
established by a particular aircraft station, aeronautical
stations should employ SELCAL whenever they require to call
aircraf.
5.2.4.5.4 PANS.- In the event the SELCAL signal
remains unanswered after 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 malfunctionzng occurs
in a SELCAL installation on the ground or in the air. Likewise,
the aircraft should ensure that the aeronautical stations
concerned with its Jlight are immediately made aware of any
malfunctioning of its SELCAL installation, and that voice
callzng 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 aircraft
5.2.4.6.1 PANS.- In principle, the SELCAL code in the
aircraft should be associated with the radiotelephony call sign,
i.e. where the Jlight number (service number) is emplqyed in
the radio call sign, the SELCAL code in the aircraft should be
listed against the flight number. In all other cases, the SELCAL
code in the aircraft should be listed against the aircraft
registration.
N o t e . The use of aircraft radio call signs, consisting of
the airline abbreviation followed by the flzght service number,
is increasing among aircraft operators throughout the world.
The SELCAL equipment in aircraft should, therefore, be of a
type which permits a particular code being associated with a
particular flight numbev, 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,
and it will not be possible for aircraft with such equipment to
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