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4.4.3.1.2 An addressee indicator, which shall be
immediately preceded by a SPACE, except when it is the first
address indicator of the second or third line of address shall
comprise:
a) the four-letter location indicator of the place of
destination;
b) the three-letter designator identifying the organization1
function (aeronautical authority, service or aircraft
operating agency) addressed;
c) an additional letter, which shall represent a department,
division or process within the organizationlfunction
addressed. The letter X shall be used to complete the
address when explicit identification is not required.
Note 1 .Th e ,four-letter location indicators are listed in
Doc 7910 - Location Indicators.
Note 2.- The three-letter designatoris are listed in
Doc 8585 - Designators for Aircraft Operating Agencies,
Aeronautical Authorities and Services.
4.4.3.1.2.1 Where a message is to be addressed to an
organization that has not been allocated an ICAO three-letter
designator of the type prescribed in 4.4.3.1.2, the location
indicator of the place of destination shall be followed by the
ICAO three-letter designator YYY (or the ICAO three-letter
designator YXY in the case of a military service or
organization). The name of the addressee organization shall
then be included in the first item of the text of the message.
The eighth position letter following the ICAO three-letter
designator Y W or YXY shall be the filler letter X.
4.4.3.1.2.2 Where a message is to be addressed to an
aircraft in flight and, therefore, requires handling over the
AFTN for part of its routing before retransmission over the
aeronautical mobile service, the location indicator of the
aeronautical station which is to relay the message to the
aircraft shall be followed by the ICAO three-letter designator
ZZZ. The identification of the aircraft shall then be included in
the first item of the text of the message. The eighth position
letter following the ICAO three-letter designator ZZZ shall be
the filler letter X.
N o t e . The,following examples illustvate application of the
Standards in 4.4.3.1.2.1 and 4.4.3.1.2.2:
Annex 10 - Aeronautical Telecommunications Volume 11
I) addvessee indicators (possible types):
LGATZTZX aerodrome control tower (ZTZ) at
LGAT
LGATYMYF section (F) of the Meteorological
Ofice (YMY) at LGAT
LGATKLMN department (N) of the aircrqft
operating agency KLM (KLW at
LGAT
LGATYYYX the aircraft operating agency whose
name appears in the beginning of the
message text and whose ofice location
is served by LGAT
LGATZZZX the aeronautical station (LGAT) is
required to relay this message in the
aeronautical mobile service to the
aircraft whose identtfication appears in
the beginning of the message text.
addressee indicators shall, in so far as practicable, be
positioned in the sequence which will ensure that the
minimum number of retransmissions will be required at
subsequent communication centres.
4.4.3.1.2.3.2 On teletypewriter circuits, the completion of
each line of addressee indicator groups in the address of a
message shall be immediately followed by the alignment
function [ e l .
4.4.4 Origin
The origin shall comprise:
a) filing time;
b) originator indicator;
c) priority alarm (when necessary);
d) optional heading field;
e) alignment function [<=I
2) YYY ICAO three-letter designator:
Example of a message addressed to (say) "Penguin
Airlines" at NCRG by the PHNL office of the same
aircraft operating agency. The Heading and Ending of
the message are not shown in this example of
teletypewriter page-copy , form.
(Addvess) GG NCRGYYYX
(Origin) 31 1521 PHNLYYYX
(Text) AIR PENGUIN FLIGHT 801
CANCELLED
3) ZZZ ICAO three-letter designator:
Example of a message addressed to aircraft GABCD via
aeronautical station NZAA,from Area Control Centre at
NZZC. The Heading and Ending of the message are not
shown in this example of teletypewriter page-copy , form.
(Address) FF NZAAZZZX
(Origin) 031451 NZZCZQZX
(Text) GABCD CLR DES 5000FT HK NDB
4.4.3.1.2.3 The complete address shall be restricted to
three lines of page-printing copy and, except as provided in
4.4.14, a separate addressee indicator shall be used for each
addressee whether at the same or at different locations.
4.4.3.1.2.3.1 Where messages are offered in page-copy
form for transmission and contain more addressee indicators
than can be accommodated on three lines of a page-copy, such
message shall be converted, before transmission, into two or
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