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The originator shall avoid the use of plain language when
reduction in the length of the text by appropriate
abbreviations and codes is practicable. Words and phrases
which are not essential, such as expressions of politeness,
shall not be used.
4.1.2.8 If the originator of a message wishes alignment
functions [<=I to be transmitted at specific places in the text
part of such message (see 4.4.5.3 and 4.4.15.3.6), the sequence
[<=I shall be written on each of those places.
N o t e . The,foregoing provisions of 4.1.2.3 are not intended
to prevent the use of the,full IA-5 after agreement between the 4.2 ATS direct speech circuits
Administrations concerned.
N o t e . Provisions relating to ATS direct speech
4.1.2.4 R~~~~ numerals shall not be employed, ~f the communications are contained in Chapter 6 of Annex 11.
originator of a message wishes the addressee to be informed
that roman figures are intended, the arabic figure or figures
shall be written and preceded by the word ROMAN.
4.1.2.5 Messages using the ITA-2 code shall not contain:
1) any uninterrupted sequence of signals nos. 26, 3, 26 and
3 (letter case and figure case) in this order, other than the
one in the heading as prescribed in 4.4.2.1.1; and
2) any uninterrupted sequence of four times signal no. 14
(letter case and figure case) other than the one in the
ending as prescribed in 4.4.6.1.
4.1.2.6 Messages using IA-5 shall not contain:
1) character Oil (SOH) other than the one in the heading as
prescribed in 4.4.15.1.1 a);
4.3 Meteorological operational
channels and meteorological
operational telecommunication networks
Meteorological operational channel procedures and meteorological
operational communication network procedures shall
be compatible with aeronautical fixed telecommunications
network (AFTN) procedures.
N o t e . "Compatible" is to he interpreted as a mode of
operation ensuring that the information exchanged over the
meteorological operational channels also can be exchanged
over the aeronautical ,fuced telecommunication network
without harmful efect on the operation of the aeronautical
,fuced telecommunication network and vice versa.
Chapter I Annex 10 - Aeronautical Telecommunications
4.4 Aeronautical fixed telecommunication
network (AFTN)
4.4.1 General
4.4.1.1 Categories of messages. Subject to the provisions
of 3.3, the following categories of message shall be handled by
the aeronautical fixed telecommunication network:
4.4.1.1.5 Flight regularity messages (priority indicator
GG) shall comprise:
a) aircraft load messages required for weight and balance
computation;
b) messages concerning changes in aircraft operating
schedules;
c) messages concerning aircraft servicing;
a) distress messages;
b) urgency messages;
c) flight safety messages;
d) meteorological messages;
e) flight regularity messages;
f) aeronautical information services (AIS) messages;
g) aeronautical administrative messages;
h) service messages.
4.4.1.1.1 Distress messages (priority indicator SS). This
message category shall comprise those messages sent by
mobile stations reporting that they are threatened by grave and
imminent danger and all other messages relative to the
immediate assistance required by the mobile station in distress.
4.4.1.1.2 Urgency messages (priority indicator DD). This
category shall comprise messages concerning the safety of a
ship, aircraft or other vehicles, or of some person on board or
within sight.
4.4.1.1.3 Flight safety messages (priority indicator FF)
shall comprise:
a) movement and control messages as defined in
PANS-ATM (Doc 4444), Chapter 10;
b) messages originated by an aircraft operating agency of
immediate concern to aircraft in flight or preparing to
depart;
c) meteorological messages restricted to SIGMET inforrnation,
special air-reports, AIRMET messages, volcanic
ash and tropical cyclone advisory information and
amended forecasts.
4.4.1.1.4 Meteorological messages (priority indicator GG)
shall comprise:
a) messages concerning forecasts, e.g. terminal aerodrome
forecasts (TAFs), area and route forecasts;
b) messages concerning observations and reports, e.g.
METAR, SPECI.
d) messages concerning changes in collective requirements
for passengers, crew and cargo covered by deviation
from normal operating schedules;
e) messages concerning non-routine landings;
f) messages concerning pre-flight arrangements for air
navigation services and operational servicing for
non-scheduled aircraft operations, e.g. overflight
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