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concerned. Such exchanges shall tale the form of complete
service messages (see 4.4.1.1.9) with the text comprising the
abbreviation SVC, the procedure signals LR and LS followed
by the transmission identifications of the relevant messages
and the end-of-text signal (see 4.4.5.6 and 4.4.15.3.12).
N o t e . The,following example illustmtes application of the
above-mentioned procedure:
4.4.1.4.1.2.1 Recommendation.- When the provisions
of 4.4.1.4.1.2 are applied, the station receiving the out-of
sequence message should synchronize such that the next
expected channel-sequence number is the last received
channel-sequence number plus one. The previous station
should check its outgoing channel-sequence numbers and, tf
necessa y, correct the sequence.
4.4.1.5 Failure of communications
4.4.1.5.1 Should communication on any fixed service
circuit fail, the station concerned shall attempt to re-establish
contact as soon as possible.
Annex 10 - Aeronautical Telecommunications Volume 11
4.4.1.5.2 Recommendation.- If contact cannot be
re-established within a reasonable period on the normal ,fuced
service circuit, an appropriate alternative circuit should be
used. If possible, attempts should be made to establish
communication on any authorizedfuced service circuit available.
4.4.1.5.2.1 If these attempts fail, use of any available
air-ground frequency shall be permitted only as an exceptional
and temporary measure when no interference to aircraft in
flight is ensured.
4.4.1.5.2.2 Where a radio circuit fails due to signal fadeout
or adverse propagation conditions, a receiving watch shall
be maintained on the regular fixed service frequency normally
in use. In order to re-establish contact on this frequency as
soon as possible there shall be transmitted:
a) the procedure signal DE;
b) the identification of the transmitting station transmitted
three times:
c) the alignment function [<=I;
d) the letters RY repeated without separation for three lines
of page copy;
e) the alignment function [<=I;
f) end-of-message signal (NNNN).
The foregoing sequence shall be repeated as required.
4.4.1.5.2.3 A station experiencing a circuit or equipment
failure shall promptly notify other stations with which it is in
direct communication if the failure will affect traffic routing by
those stations. Restoration to normal shall also be notified to
the same stations.
4.4.1.5.3 Where diverted traffic will not be accepted
automatically or where a predetermined diversion routing has
not been agreed, a temporary diversion routing shall be
established by the exchange of service messages. The text of
such service messages shall comprise:
1) the abbreviation SVC;
a) to request a diver,sion:
SVC+QSP+RQ+C+K+BG+BI~=
b) to accept a diversion:
SVC+QSP+C+K+BG+BI~=
c) to refuse a diversion:
SVC+QSP+NO+C+K+BG+BIJ<=
dj to cancel a diversion:
4.4.1.6 Long-term retention of
AFTN tr@c records
4.4.1.6.1 Copies of all messages, in their entirety,
transmitted by an AFTN origin station shall be retained for a
period of at least 30 days.
N o t e . The AFTN origin station, although responsible,for
ensuring that AFTN trufic is recorded, is not necessarily the
unit where the records are made and retained. Bv local
agreement the State concerned may permit the originators to
perform those,functions.
4.4.1.6.2 AFTN destination stations shall retain, for a
period of at least 30 days, a record containing the information
necessary to identify all messages received and the action
talcen thereon.
N o t e . The pvovision ,for identification of messages
mentioned in 4.4.1.6.2 may be obtained by recording the
heading, address and origin parts of messages.
4.4.1.6.3 Recommendation.- AFTN communication
centres should retain, ,for a period of at least 30 days, a record
containing the information necessary to identjh all messages
relayed or retransmitted and the action taken thereon.
Note I . The provision ,for identjfication of messages
mentioned in 4.4.1.6.3 may be obtained by recording the
heading, address and origin parts of messages.
2) the procedure signal QSP; Note 2 . Provisions relating to short-term retention of
AFTN trufic records in AFTN communication centres are
3) if required, the procedure signal RQ, NO or CNL to contained in 4.4.1.7.
request, refuse or cancel a diversion;
4) identification of the routing areas, States, territories, 4.4.1.7 Short-term retention of
locations, or stations for which the diversion applies; AFTN tr@c records
5) the end-of-text signal. 4.4.1.7.1 Except as provided in 4.4.1.7.2, AFTN
　
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