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ATS messages constructed as prescribed in
Appendix 3. Such local variants are easily learned
and are of no consequence.
11.2.2 Preparation and transmission of messages
11.2.2.1 Air traffic services messages shall be prepared
and transmitted with standard texts in a standard format and in
accordance with standard data conventions, as and when
prescribed in Appendix 3.
11.2.2.2 When messages are exchanged orally between
the relevant air traffic services units, an oral acknowledgement
shall constitute evidence of receipt of the message. No
confirmation in written form shall therefore be required.
Note.— See Annex 11, Chapter 6, regarding the
requirement for recording of direct-speech communications.
11.3 METHODS OF MESSAGE EXCHANGE
11.3.1 The lead-time requirements of air traffic control
and flow control procedures shall determine the method of
message exchange to be used for the exchange of ATS data.
11.3.1.1 The method of message exchange shall also be
dependent upon the availability of adequate communications
channels, the function to be performed, the types of data to be
exchanged and the processing facilities at the centres
concerned.
11.3.2 Basic flight plan data necessary for flow control
procedures shall be furnished at least 60 minutes in advance of
the flight. Basic flight plan data shall be provided by either a
filed flight plan or a repetitive flight plan submitted by mail in
the form of a repetitive flight plan listing form or other media
suitable for electronic data processing systems.
11.3.2.1 Flight plan data submitted in advance of flight
shall be updated by time, level and route changes and other
essential information as may be necessary.
11.3.3 Basic flight plan data necessary for air traffic
control purposes shall be furnished to the first en-route control
centre at least 30 minutes in advance of the flight, and to each
successive centre at least 20 minutes before the aircraft enters
that centre’s area of jurisdiction, in order for it to prepare for
the transfer of control.
11.3.4 The second en-route centre and each successive
centre shall be provided with current data, including updated
basic flight plan data, contained in a current flight plan
message or in an estimate message supplementing already
available updated basic flight plan data.
11.3.5 In areas where automated systems are utilized for
the exchange of flight plan data and where these systems
provide data for several ACCs, approach control units and/or
aerodrome control towers, the appropriate messages shall not
be addressed to each individual ATS unit, but only to these
automated systems.
Note.— Further processing and distribution of the data to
its associated ATS units is the internal task of the receiving
system.
11.3.6 Filed flight plan data and
associated update messages
Filed flight plan data and associated update messages shall be
addressed simultaneously to the first en-route control centre, to
all other ATS units along the route of flight which are unable
to obtain or process current flight plan data, and to air traffic
flow management units concerned.
11.3.7 Coordination and transfer data
11.3.7.1 Progression of a flight between successive
control sectors and/or control centres shall be effected by a coordination
and transfer process comprising the following
stages:
a) the announcement of the flight and the proposed
conditions of transfer of control; and
b) coordination of the conditions of transfer and
acceptance followed by the assumption of control by
the receiving unit.
11.3.7.2 The announcement of the flight shall be by a
current flight plan message containing all relevant ATS data or
by an estimate message containing the proposed conditions of
transfer. An estimate message shall be used only when updated
basic flight plan data is already available at the receiving ATS
unit.
11.3.7.3 A receiving ATS unit to whom the proposed
conditions of transfer are not acceptable shall decline to accept
the aircraft as proposed and shall initiate further coordination
by proposing alternative acceptable conditions.
Chapter 11. Air Traffic Services Messages 11-5
1/11/01
11.3.7.4 The coordination process shall be considered to
be completed as soon as the proposed conditions contained in
the current flight plan message, or in the estimate message or
in one or more counter-proposals, are accepted by an operational
or logical procedure.
11.3.7.5 Unless an operational acknowledgement is
received, a logical acknowledgement message shall be automatically
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