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shall:
a) stop processing the message; and
b) send a service message to the station from which the
message was received.
4.4.1 1.15.1 The text of the service message shall
comprise:
1) the abbreviation SVC;
3) the procedure signal OGN;
4) the transmission identification of the message rejected;
5) the indicator INCORRECT; and
6) the end-of-text signal.
N o t e . The,following ITA-2 example illustrates application
of the ahove-mentioned procedure:
4.4.1 1.15.2 The station receiving a service message as
prescribed in 4.4.1 1.15.1 shall resume responsibility for the
referenced message and shall retransmit the message with a
correct originator indicator and, if applicable, a new
transmission identification.
N o t e . When applying the provisions of4.4.11.15 the relay
centre requirement is as a minimum the first character of the
originator indicator verified as the first character of the
location indicator of the place at which the message is
originated.
4.4.12 Correction of errors during
tape preparation
4.4.12.1 Messages for which tapes are prepared at the
origin station shall not be allowed to flow into the AFTN with
Imown uncorrected errors.
4.4.12.2 Errors made ahead of the text of a message shall
be corrected by discarding the incorrect tape and preparing a
new one.
4.4.12.3 Where possible, errors made in the text of a
message shall be corrected by back-spacing the tape and
eliminating the error by operation of the LETTERS [J] lcey
over the undesired portion.
4.4.12.4 Where the action of 4.4.12.3 is not possible,
correction to the text shall be made immediately after the error
by making the error sign (+E+E+E+), transmitting the last
correct word or group and then continuing with the tape
preparation.
4.4.12.5 Where neither the action of 4.4.12.3 nor the
action of 4.4.12.4 is possible because the error in the text is not
noticed until later in the preparation process (but before the
end-of-message signal has been added) the station shall
comply with the provisions of 4.4.5.5.
2) the procedure signal QTA; 4.4.12.6 The ending must be typed without error.
Annex 10 - Aeronautical Telecommunications Volume I1
4.4.13 Correction of errors during
message origination in cases where
the message is flowing into the AFTN
during preparation
4.4.13.1 Messages flowing into the AFTN during
preparation shall not be terminated with an end-of-message
signal if they contain Imown uncorrected errors.
4.4.13.2 Where an error is made, in this circumstance, in
any part of the message which precedes the text, the
unfinished message shall be cancelled by sending the sequence
~ = Q T A + Q T A ~ =fo llowed by a complete ending (see
4.4.6).
4.4.13.3 Errors made in the text and noticed immediately
shall be corrected by making the error sign (+E+E+E+),
transmitting the last correct word or group and then continuing
with the message.
4.4.13.4 In cases where errors are made in the text and not
noticed until later in the origination process, the station shall
comply with the provisions of 4.4.5.5.
4.4.13.5 In cases where it becomes obvious, during the
origination of the text, that the message should be cancelled,
the station shall tale the action described in 4.4.13.2.
4.4.14 Predetermined distribution
system for AFTN messages
4.4.14.1 When it has been agreed between the
Administrations concerned to make use of a predetermined
distribution system for AFTN messages, the system described
below shall be used.
4.4.14.2 The Predetermined Distribution Addressee Indicator
(PDAI) shall be constructed as follows:
a) The first and second letters:
The first two letters of the Location Indicator of the
communications centre of the State which has agreed to
implement the system and which receives messages over
a circuit for which it has a predetermined routing
responsibility;
b) The third and fourth letters:
The letters ZZ, indicating a requirement for special
distribution;
c) The fifth, sixth and seventh letters:
1) The fifth, sixth and seventh letters talen from the
series A to Z and denoting the national andlor
international distribution list(s) to be used by the
receiving AFTN centre;
2) " N and "S', as the fifth letter, are reserved for
NOTAM and SNOWTAM respectively (see
Appendix 5 to Annex 15);
d) The eighth letter:
Either the filler letter " X or a letter talen from the
series A to Z to further define the national andlor
international distribution list(s) to be used by the
receiving AFTN centre.
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