4.2.2.4.1 A CHG message shall be transmitted when any change is to be made to basic flight plan data contained in previously transmitted FPL or RPL data. The CHG message shall be sent to those recipients of basic flight plan data which are affected by the change.
Note.— See 4.2.3.4 concerning notification of a change to co-ordination data contained in a previously transmitted current flight plan or estimate message.
4.2.2.5 Flight plan cancellation (CNL) messages

4.2.2.5.1 A flight plan cancellation (CNL) message shall be transmitted when a flight, for which basic flight plan data has been previously distributed, has been cancelled. The ATS unit serving the departure aerodrome shall transmit the CNL message to ATS units which have received basic flight plan data.
4.2.2.6 Departure (DEP) messages

4.2.2.6.1 Unless otherwise prescribed on the basis of regional air navigation agreements, a DEP message shall be transmitted immediately after the departure of an aircraft for which basic flight plan data has been previously distributed.
4.2.2.6.2 The DEP message shall be transmitted by the ATS unit serving the departure aerodrome to all recipients of basic flight plan data.
Note.— See 4.2.3.4 concerning notification of the

departure of an aircraft for which a CPL message has been
transmitted.
4.2.2.7 Arrival (ARR) messages

4.2.2.7.1 When an arrival report is received by the ATS unit serving the arrival aerodrome, this unit shall transmit an ARR message:
a)  for a landing at the destination aerodrome:
1)  to the area control centre or flight information centre in whose area the arrival aerodrome is located, if required by that unit; and
2)  to the air traffic services unit, at the departure aerodrome, which originated the flight plan message, if that message included a request for an ARR message;
b) for a landing at an alternate or other aerodrome:
1)  to the area control centre or flight information centre in whose area the arrival aerodrome is located; and
2)  to the aerodrome control tower at the destination aerodrome; and
3)  to the air traffic services reporting office at the departure aerodrome; and
4)  to the area control centre or flight information centre in charge of each flight information region or upper flight information region through which the aircraft would have passed according to the flight plan, had it not diverted.

4.2.2.7.2 When a controlled flight which has experienced failure of two-way communication has landed, the aerodrome control tower at the arrival aerodrome shall transmit an ARR message:
a)  for a landing at the destination aerodrome:
1)  to all air traffic services units concerned with the flight during the period of the communication failure; and
2)  to all other air traffic services units which may have been alerted;
b)  for a landing at an aerodrome other than the destination aerodrome:
to the ATS unit serving the destination aerodrome; this unit shall then transmit an ARR message to other ATS units concerned or alerted as in a) above.

4.2.3 Co-ordination messages
Note.— The provisions governing co-ordination are

contained in Part VIII. Phraseology to be used in voice
communication is contained in Part X.
4.2.3.1 Co-ordination messages comprise:
—  
current flight plan messages (4.2.3.2)

—  
estimate messages (4.2.3.3)

—  
co-ordination messages (4.2.3.4)

—  
acceptance messages (4.2.3.5)

—  
logical acknowledgement messages (4.2.3.6).

4.2.3.2 Current flight plan (CPL) messages

4.2.3.2.1 Unless basic flight plan data have already been distributed (FPL or RPL) which will be supplemented by co-ordination data in the estimate message, a CPL message shall be transmitted by each area control centre to the next area control centre and from the last area control centre to the aerodrome control tower at the destination aerodrome, for each controlled flight, and for each flight 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.
　
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