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5.2.3.2.1 PANS.- I f it is not possible to deliver an ATS manipulation (space E space E space E space), followed
message to the aircmjl within the time specijkd by ATS, the by the correct information. Errors detected ajler the
aeronautical station should notify the originator. Thereajier, it completion of the entry should be corrected ajier the last
should take no further action with respect to this message entry, using the abbreviation COR, followed by the
unless specifically instructed by ATS. correct information.
5.2.3.2.2 PANS.- I f delivery of an ATS message is
uncertain because of inability to secure an acknowledgement, 5.2.4 SELCAL procedures
the aeronautical station should assume that the message has
not been received by the aircraji and should advise the Note.- The procedures contained in 5.2.4 are applicable
originator immediately that, although the message has been when SELCAL is used and replace certain of the procedures
transmitted. it has not been acknowledged related to calling contained in 5.2.1.
5.2.3.2.3 PANS.- The aeronautical station, having
received the message from ATS, should not delegate to another
station the responsibility for delivery of the message to the
aircraji. However, in case of communication diflculties, other
stations should assist, when requested, in relaying the message
to the aircrafr. In this case, the station having received the
message from ATS should obtain without delay definite
assurance that the aircraji has correctly acknowledged the
message.
5.2.3.3 Recording of air-ground communications
on teletypewriter
5.2.4.1 General
5.2.4.1.1 PANS.- With the selective calling system
known as SELCAL, the voice calling is replaced by the transmission
of coded tones to the aircmfr over the radiotelephony
channels. A single selective call consists of a combination of
four pre-selected audio tones whose transmission requires
approximately 2 seconds. The tones are generated in the
aeronautical station coder and are received by a decoder
connected to the audio output of the airborne receiver. Receipt
of the assigned tone code (SELCAL code) activates a cockpit
call system in the jonn of light and/or chime signals.
5.2.3.3.1 PANS.- When recording on teletypewriter, the Note.- Due to the limited number of SELCAL codes,
following procedure should be used: similar code assignments to multiple aircraji may be expected.
24/11/05
No. 80
Annex I0 - Aeronautical Telecommunications Volume ZZ
Therefore, the use of correct radiotelephony (RTF) procedures
contained in this chapter is emphasized when establishing
communications via SELCAL.
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 VHF radio channels.
5.2.4.1.3 PANS.- On aircraft equipped with SELCAL,
the pilot is still able to keep a conventional listening watch if
required.
5.2.4.2 Notification to aeronautical stations
of aircraji SELCAL codes
5.2.4.2.1 PANS.- It is the responsibility of the aircraji
operating agency and the aircraft to ensure that all
aeronautical stations, with which the aircraji would normally
communicate during a particular flight, know the SELCAL
code associated with its radiotelephony call sign.
5.2.4.2.2 PANS.- When practicable, the aircraji
operating agency should disseminate to all aeronautical
stations concerned, at regular intervals, a list of SELCAL
codes assigned to its aircrafi or flights.
5.2.4.2.3 PANS.- The aircmji should:
a) include the SELCAL code in the flight plan submitted to
the appropriate air traffic services unit; and
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 VHF coverage.
Note.- Provisions regarding completion of the flight plan
are set forth in the PANS-ATM (Doc 4444).
5.24.3 Pre-flight check
5.2.4.3.1 PANS.- The aircraft station should contact the
appropriate aeronautical station and request a pre-fight
SELCAL check and, if necessary, give its SELCAL code.
5.2.4.3.2 PANS.- When primary and secondary
frequencies are assigned, a SELCAL check should normally be
made first on the secondaryfrequency and then on the primary
frequency. The aircraft station would then be ready for
continued communication on the primary frequency.
5.2.4.3.3 PANS.- Should the pre-flght check reveal that
either the ground or airborne SELCAL installation is
inoperative, the aircraji should maintain a continuous listening
watch on its subsequent flight until SELCAL again becomes
　
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