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11.2.1.2.5);
b) the air traffic services data, preceded if necessary by
the supplementary address information described in
11.2.1.2.6, and prepared in accordance with
Appendix 3. These data will be transmitted as the text
of the AFTN message.
11.2.1.2.2 PRIORITY INDICATOR
This shall consist of the appropriate two-letter Priority
Indicator for the message as shown in parentheses for the
appropriate category of message in Section 11.1.
Note.— It is prescribed in Annex 10 (Vol. II, Chapter 4)
that the order of priority for the transmission of messages in
the AFTN shall be as follows:
Transmission Priority Priority Indicator
1 SS
2 DD FF
3 GG KK
Chapter 11. Air Traffic Services Messages 11-3
1/11/01
11.2.1.2.3 ADDRESS
11.2.1.2.3.1 This shall consist of a sequence of
Addressee Indicators, one for each addressee to whom the
message is to be delivered.
11.2.1.2.3.2 Each Addressee Indicator shall consist of an
eight-letter sequence comprising, in the following order:
a) the ICAO four-letter Location Indicator assigned to the
place of destination;
Note.— A list of ICAO Location Indicators is
contained in Doc 7910 — Location Indicators.
b) i) the ICAO three-letter designator identifying the
aeronautical authority, service or aircraft operating
agency addressed, or
ii) in cases where no designator has been assigned,
one of the following:
— “YXY” in the case where the addressee is a
military service/organization,
— “ZZZ” in the case where the addressee is an
aircraft in flight,
— “YYY” in all other cases;
Note.— A list of ICAO three-letter designators is
contained in Doc 8585 — Designators for Aircraft
Operating Agencies, Aeronautical Authorities and
Services.
c) i) the letter X, or
ii) the one-letter designator identifying the department
or division of the organization addressed.
11.2.1.2.3.3 The following three-letter designators shall
be used when addressing ATS messages to ATS units:
Centre in charge of a Flight Information Region or an
Upper Flight Information Region (whether ACC or FIC):
— if the message is relevant to an IFR flight ZQZ
— if the message is relevant to a VFR flight ZFZ
Aerodrome Control Tower ZTZ
Air Traffic Services Reporting Office ZPZ
Other three-letter designators for ATS units shall not be used
for that purpose.
11.2.1.2.4 FILING TIME
The filing time shall consist of a six-digit date-time group
indicating the date and the time of filing the message for
transmission with the aeronautical fixed station concerned.
11.2.1.2.5 ORIGINATOR INDICATOR
The Originator Indicator shall consist of an eight-letter
sequence, similar to an Addressee Indicator (see 11.2.1.2.3.2),
identifying the place of origin and the organization originating
the message.
11.2.1.2.6 SUPPLEMENTARY INFORMATION ON THE
11.2.1.2.6 ADDRESS AND THE ORIGIN
The following supplementary information is required when, in
the Indicators of the Address and/or Origin, the three-letter
designators “YXY”, “ZZZ” or “YYY” (see 11.2.1.2.3.2 b) ii))
are used:
a) the name of the organization or the identity of the
aircraft concerned is to appear at the beginning of the
text;
b) the order of such insertions is to be the same as the
order of the Addressee Indicators and/or the Originator
Indicator;
c) where there are more than one such insertion, the last
should be followed by the word “STOP”;
d) where there are one or more insertions in respect of
Addressee Indicators plus an insertion in respect of the
Originator Indicator, the word “FROM” is to appear
before that relating to the Originator Indicator.
Note.— Regarding ATS messages received in
teletypewriter page-copy form:
1) ATS messages received via the AFTN will have
been placed within a communications “envelope”
(preceding and following character sequences
which are necessary to ensure correct transmission
via the AFTN). Even the text of the AFTN
message may be received with words or groups
preceding and following the ATS text.
2) The ATS message may then be located by the
simple rule that it is preceded by an Open Bracket,
e.g., ‘(’ and followed by a Close Bracket, e.g., ‘)’.
11-4 Air Traffic Management (PANS-ATM)
1/11/01
3) In some local cases, the teletypewriter machines in
use will always print two specific symbols other
than Open Bracket and Close Bracket on receipt of
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