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transmitted by the receiving computer in order to
ensure the integrity of the coordination process employing
computer-to-computer links. This message shall be transmitted
when the transfer data has been received and processed to the
point that, in the event of a temporary failure by the receiving
computer, the information will be brought to the attention of
the appropriate air traffic controller.
11.3.7.6 The transfer of control shall be either explicit
or, by agreement between the two units concerned, implicit,
i.e. no communication need be exchanged between the
transferring and accepting units.
11.3.7.7 When the transfer of control involves exchange
of data, the proposal for transfer shall include radar
information if appropriate. Since the proposal relates to
previously accepted coordination data, further coordination
shall normally not be required. However, acceptance shall be
required.
11.3.7.8 If after receipt of radar information the
accepting centre is unable to identify the aircraft immediately,
additional communication shall ensue to obtain new radar
information, if appropriate.
11.3.7.9 When control has been assumed of the
transferred aircraft the accepting unit shall complete the
transfer of control process by communicating assumption of
control to the transferring unit, unless special arrangements
have been made between the units concerned.
11.3.8 Supplementary data
11.3.8.1 When basic flight plan data or supplementary
flight plan data are required, request messages shall be
addressed to the ATS unit which is most likely to have access
to the required data.
Note.— See 11.4.2.4.2 and 11.4.2.4.3 for ATS units to
which request messages shall be addressed.
11.3.8.2 If the requested information is available, a filed
or a supplementary flight plan message shall be transmitted.
11.4 MESSAGE TYPES AND
THEIR APPLICATION
11.4.1 Emergency messages
11.4.1.1 The various circumstances surrounding each
known or suspected emergency situation preclude the specification
of standard message types to provide for emergency
communications, except as described in 11.4.1.2 and 11.4.1.3.
11.4.1.2 ALERTING (ALR) MESSAGES
11.4.1.2.1 When an air traffic services unit considers that
an aircraft is in a state of emergency as defined in Annex 11,
Chapter 5, an alerting message shall be transmitted to any air
traffic services unit that may be concerned with the flight and
to the associated rescue coordination centres, containing such
of the information specified in Appendix 3, Section 1, as is
available or can be obtained.
11.4.1.2.2 When so agreed between the air traffic
services units concerned, a communication relating to an
emergency phase and originated by a unit employing
automatic data-processing equipment may take the form of a
modification message (as in 11.4.2.2.4), supplemented by a
verbal message giving the additional details prescribed for
inclusion in an alerting message.
11.4.1.3 RADIOCOMMUNICATION FAILURE (RCF)
MESSAGES
Note.— Provisions governing the action to be taken in the
event of radiocommunication failure are set forth in Annex 2,
3.6.5.2, and in Chapter 15, Section 15.2 of this document.
11.4.1.3.1 When an air traffic services unit is aware that
an aircraft in its area is experiencing radiocommunication
failure, an RCF message shall be transmitted to all subsequent
ATS units along the route of flight which have already
received basic flight plan data (FPL or RPL) and to the
aerodrome control tower at the destination aerodrome, if basic
flight plan data has been previously sent.
11.4.1.3.2 If the next ATS unit has not yet received basic
flight plan data because it would receive a current flight plan
message in the coordination process, then an RCF message
and a current flight plan (CPL) message shall be transmitted to
this ATS unit. In turn, this ATS unit shall transmit an RCF
message and a CPL message to the next ATS unit. The above
11-6 Air Traffic Management (PANS-ATM)
1/11/01
process shall be repeated progressively from centre to centre
up to the first ATS unit along the remaining route of flight to
which basic flight plan data has already been sent.
11.4.2 Movement and control messages
11.4.2.1 Messages concerning the intended or actual
movement of aircraft shall be based on the latest information
furnished to air traffic services units by the pilot, the operator
or its designated representative, or derived from groundbased
radar.
11.4.2.2 FILED FLIGHT PLAN MESSAGES AND
ASSOCIATED UPDATE MESSAGES
11.4.2.2.1 Filed flight plan messages and associated
　
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