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(This indicates the 39th message of the day transmitted on comprise:
Channel B of the circuit from Station G to Station L.)
a) the four-letter location indicator of the place of
4.4.2.1.3 Optional service information shall be permitted destination;
to be inserted following the transmission identification subject
to agreement between the authorities responsible for the b) the three-letter designator identifying the organization/
operation of the circuit. Such additional service information function (aeronautical authority, service or aircraft
shall be preceded by a SPACE followed by not more than ten operating agency) addressed;
characters and shall not contain any alignment functions.
c) an additional letter, which shall represent a department,
4.4.2.1.4 Recommendation. To avoid any division or process within the organization/function
misinterpretation of the diversion indicator especially when addressed. The letter X shall be used to complete the
considering the possibility of a partly mutilated heading, the address when explicit identification is not required.
sequence of two consecutive signals no. 22 (in the letter case
or in the figure case) should not appear in any other Note 1. The four-letter location indicators are listed in
component of the heading. Doc 7910 Location Indicators.
Note 2. The three-letter designators are listed in
4.4.3 Address Doc 8585 Designators for Aircraft Operating Agencies,
Aeronautical Authorities and Services.
4.4.3.1 The address shall comprise:
4.4.3.1.2.1 Where a message is to be addressed to an
a) alignment function [
designator of the type prescribed in 4.4.3.1.2, the location
b) priority indicator; indicator of the place of destination shall be followed by the
ICAO three-letter designator YYY (or the ICAO three-letter
c) addressee indicator(s); designator YXY in the case of a military service or
organization). The name of the addressee organization shall
d) alignment function [
The eighth position letter following the ICAO three-letter
4.4.3.1.1 The priority indicator shall consist of the designator YYY or YXY shall be the filler letter X.
appropriate two-letter group assigned by the originator in
accordance with the following: 4.4.3.1.2.2 Where a message is to be addressed to an
aircraft in flight and, therefore, requires handling over the
Priority AFTN for part of its routing before retransmission over the
Message category indicator aeronautical mobile service, the location indicator of the
aeronautical station which is to relay the message to the
distress messages (see 4.4.1.1.1) . . . . . . . . . . . SS aircraft shall be followed by the ICAO three-letter designator
ZZZ. The identification of the aircraft shall then be included in
urgency messages (see 4.4.1.1.2) . . . . . . . . . . . DD the first item of the text of the message. The eighth position
letter following the ICAO three-letter designator ZZZ shall be
flight safety messages (see 4.4.1.1.3). . . . . . . . FF the filler letter X.
meteorological messages (see 4.4.1.1.4) . . . . . GG Note. The following examples illustrate application of the
Standards in 4.4.3.1.2.1 and 4.4.3.1.2.2:
4-9 1/11/01
Annex 10 Aeronautical Telecommunications Volume II
1) addressee indicators (possible types): addressee indicators shall, in so far as practicable, be
positioned in the sequence which will ensure that the
LGATZTZX aerodrome control tower (ZTZ) at minimum number of retransmissions will be required at
LGAT subsequent communication centres.
LGATYMYF section (F) of the Meteorological 4.4.3.1.2.3.2 On teletypewriter circuits, the completion of
Office (YMY) at LGAT each line of addressee indicator groups in the address of a
message shall be immediately followed by the alignment
LGATKLMN department (N) of the aircraft function [
operating agency KLM (KLM) at
LGAT 4.4.4 Origin
LGATYYYX the aircraft operating agency whose The origin shall comprise:
name appears in the beginning of the
message text and whose office location a) filing time;
is served by LGAT
b) originator indicator;
LGATZZZX the aeronautical station (LGAT) is
required to relay this message in the c) priority alarm (when necessary);
aeronautical mobile service to the
aircraft whose identification appears in d) optional heading field;
the beginning of the message text.
e) alignment function [
2) YYY ICAO three-letter designator:
4.4.4.1 The filing time shall comprise the 6-digit date-
Example of a message addressed to (say) Penguin time group indicating the date and time of filing the message
Airlines at NCRG by the PHNL office of the same for transmission (see 3.4.2); in teletypewriter operation, the
aircraft operating agency. The Heading and Ending of filing time shall be followed by one LETTER SHIFT [!].
the message are not shown in this example of
teletypewriter page-copy form. 4.4.4.2 An originator indicator, which shall be
immediately preceded by a SPACE, shall comprise:
(Address) GG NCRGYYYX
(Origin) 311521 PHNLYYYX a) the four-letter location indicator of the place at which
(Text) AIR PENGUIN FLIGHT 801 the message is originated;
CANCELLED b) the three-letter designator identifying the organization/
function (aeronautical authority, service or aircraft
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