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5.2.3.1.3 PANS.- The provisions of 5.2.3.1.2 should also
be applied, 7f practicable, in non-network operation.
5.2.3.1.4 Recommendation.- When a message addressed
to an aircraft in flight is received by the aeronautical
station included in the address, and when that station is not
able to establish communication with the aircraft to which the
message is addressed, the message should be forwarded to
those aeronautical stations on the route which may be able to
establish communication with the aircraft.
N o t e . This does not preclude the transmission by the
forwarding aeronautical station, of the original message to the
aircraf addressed, 7f the forwarding station is later able to
communicate with that aircraf.
5.2.3.1.4.1 Recommendation.- If the aeronautical
station to which the message is addressed is unable to dispose
of the message in accordance with 5.2.3.1.4, the station oJ
origin should be advised.
5.2.3.1.4.2 The aeronautical station forwarding the
message shall amend the address thereof, by substituting for its
own location indicator the location indicator of the
aeronautical station to which the message is being forwarded.
5.2.3.2 Transmission of ATS messages
to aircraft
5.2.3.2.1 PANS.- If it is not possible to deliver an ATS
message to the aircraft within the time spec@ed by ATS, the
aeronautical station should n o t ~ bth e originator. Thereafter, it
should take no further action with respect to this message
unless spec7jcally instructed by ATS.
5.2.3.2.2 PANS.- If delivery of an ATS message is
uncertain because of inability to secure an acknowledgement,
the aeronautical station should assume that the message has
not been received by the aircraft and should advise the
originator immediately that, although the message has been
transmitted, it has not been acknowledged.
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
aircraf. However, in case of communication d7ficulties, other
stations should assist, when requested, in relaying the message
to the aircraft. In this case, the station having received the
message from ATS should obtain without delay deJinite
assurance that the aircraft has correctly acknowledged the
message.
5.2.3.3 Recording of air-pound communications
on teletypewriter
5.2.3.3.1 PANS.- When recording on teletypewriter, the
following procedure should be used:
a) each line should begin at the left margin;
b) a new line should be used for each transmission;
c) each communication should contain some or all of the
following items in the order shown:
Chapter 5 Annex 10 - Aeronautical Telecommunications
1) call sign of the calling station;
2) text of the message;
3) call sign of the station called or the receiving station,
followed by the appropriate abbreviation to indzcate
"Received", "Readback", or "No reply heard";
4) call sign of station(s) acknowledging intercept
followed by appropriate abbreviation to indicate
"Received";
5) designation of frequency used;
6) time in UTC of the communication;
dj missing parts of the message text should be indicated by
typing the three periods (space . space . space . spacej
or three letters M (space M space M space M space);
ej correction of typing errors should be made by keyboard
manipulation (space E space E space E spacej, followed
by the correct information. Errors detected after the
completion of the enhy should be corrected after the last
entry, using the abbreviation COR, followed by the
correct information.
5.2.4 SELCAL procedures
N o t e . The procedures contained in 5.2.4 are applicable
when SELCAL is used and replace certain of the procedures
related to calling contained in 5.2.1.
5.2.4.1 General
5.2.4.2 NotzJication to aeronautical stations
of aircraft SELCAL codes
5.2.4.2.1 PANS.- It is the responsibility of the aircraft
operating agency and the aircraft to ensure that all
aeronautical stations, with which the aircraft 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 aircraft
operating agency should disseminate to all aeronautical
stations concerned, at regular intervals, a list of SELCAL
codes assigned to its aircraft or flights.
5.2.4.2.3 PANS.- The aircraft should:
a) include the SELCAL code in the flight plan submitted to
the appropriate air traffic services unit; and
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