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provided with air traffic advisory service along routes or
portions of routes where it has been determined by the
appropriate ATS authority that adequate point-to-point
communications exist and that conditions are otherwise
suitable for forwarding current flight plan information.
11.4.2.3.2.2 When an aircraft traverses a very limited
portion of a control area where, by agreement between the
appropriate ATS authorities concerned, coordination of air
traffic through that portion of the control area has been
delegated to and is effected directly by the two centres whose
control areas are separated by that portion, CPLs shall be
transmitted directly between such units.
11.4.2.3.2.3 A CPL message shall be transmitted in
sufficient time to permit each air traffic services unit
concerned to receive the information at least 20 minutes before
the time at which the aircraft is estimated to pass the transfer
of control point or boundary point at which it comes under the
control of such unit, unless another period of time has been
prescribed by the appropriate ATS authority. This procedure
shall apply whether or not the ATS unit responsible for
origination of the message has assumed control of, or
established contact with, the aircraft by the time the
transmission is to be effected.
11.4.2.3.2.4 When a CPL message is transmitted to a
centre which is not using automatic data processing equipment,
the period of time specified in 11.4.2.3.2.3 may be
insufficient, in which case an increased lead-time shall be
agreed.
11.4.2.3.2.5 A CPL message shall include only
information concerning the flight from the point of entry into
the next control area or advisory airspace to the destination
aerodrome.
11.4.2.3.3 ESTIMATE (EST) MESSAGES
11.4.2.3.3.1 When basic flight plan data for a flight has
been provided, an EST message shall be transmitted by each
ACC or flight information centre to the next ACC or flight
information centre along the route of flight.
11.4.2.3.3.2 An EST message shall be transmitted in
sufficient time to permit the air traffic services unit concerned
to receive the information at least 20 minutes before the time
at which the aircraft is estimated to pass the transfer of control
point or boundary point at which it comes under the control of
such unit, unless another period of time has been prescribed by
the appropriate ATS authority. This procedure shall apply
whether or not the ACC or flight information centre responsible
for origination of the message has assumed control of, or
established contact with, the aircraft by the time the
transmission is to be effected.
11.4.2.3.3.3 When an EST message is transmitted to a
centre which is not using automatic data processing equipment,
the period of time specified in 11.4.2.3.3.2 may be
insufficient, in which case an increased lead-time shall be
agreed.
11.4.2.3.4 COORDINATION (CDN) MESSAGES
11.4.2.3.4.1 A CDN message shall be transmitted during
the coordination process by an accepting unit to the transferring
unit when the former wishes to propose a change to coordination
data as contained in a previously received CPL or
EST message.
Chapter 11. Air Traffic Services Messages 11-9
1/11/01
11.4.2.3.4.2 If the transferring unit wishes to propose a
change to the data contained in a CDN message received from
the accepting unit, a CDN message shall be transmitted to the
accepting unit.
11.4.2.3.4.3 The process described above is repeated
until the coordination process is completed by the transmission
of an acceptance (ACP) message by one of the two units
concerned. Normally, however, when a change is proposed to
a CDN message, direct-speech circuits shall be used to resolve
this issue.
11.4.2.3.4.4 After the coordination process has been
completed, if one of the two ATS units concerned wishes to
propose or notify any change in basic flight plan data or
conditions of transfer, a CDN message shall be transmitted to
the other unit. This requires that the coordination process be
repeated.
11.4.2.3.4.5 A repeated coordination process requires to
be completed by the transmission of an ACP message.
Normally, in a repeated coordination process, direct-speech
circuits shall be used.
11.4.2.3.5 ACCEPTANCE (ACP) MESSAGE
11.4.2.3.5.1 Unless special arrangements have been
made between the air traffic control units concerned in
accordance with Chapter 10, 10.4.2.3.1, an ACP message shall
be transmitted by an accepting unit to the transferring unit to
indicate that data in a CPL or an EST message is accepted.
　
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