11.4.2.2.3 DELAY (DLA) MESSAGES
11.4.2.2.3.1 A DLA message shall be transmitted when
the departure of an aircraft, for which basic flight plan data
(FPL or RPL) has been sent, is delayed by more than 30
minutes after the estimated off-block time contained in the
basic flight plan data.
11.4.2.2.3.2 The DLA message shall be transmitted by
the air traffic services unit serving the departure aerodrome to
all recipients of basic flight plan data.
Note.— See 11.4.2.3.4 concerning notification of a delayed
departure of an aircraft for which a CPL message has been
transmitted.
11.4.2.2.4 MODIFICATION (CHG) MESSAGES
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 11.4.2.3.4 concerning notification of a change
to coordination data contained in a previously transmitted
current flight plan or estimate message.
11.4.2.2.5 FLIGHT PLAN CANCELLATION (CNL) MESSAGES
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.
11.4.2.2.6 DEPARTURE (DEP) MESSAGES
11.4.2.2.6.1 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 have been previously distributed.
11.4.2.2.6.2 The DEP message shall be transmitted by
the ATS unit serving the departure aerodrome to all recipients
of basic flight plan data.
Note.— See 11.4.2.3.4 concerning notification of the
departure of an aircraft for which a CPL message has been
transmitted.
11.4.2.2.7 ARRIVAL (ARR) MESSAGES
11.4.2.2.7.1 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 ACC 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 ACC 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 ACC or flight information centre in charge
of each FIR or upper FIR through which the
aircraft would have passed according to the flight
plan, had it not diverted.
11.4.2.2.7.2 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:
11-8 Air Traffic Management (PANS-ATM)
1/11/01
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.
11.4.2.3 COORDINATION MESSAGES
Note.— The provisions governing coordination are
contained in Chapter 10. Phraseology to be used in voice
communication is contained in Chapter 12.
11.4.2.3.1 Coordination messages comprise:
— current flight plan messages (11.4.2.3.2)
— estimate messages (11.4.2.3.3)
— coordination messages (11.4.2.3.4)
— acceptance messages (11.4.2.3.5)
— logical acknowledgement messages (11.4.2.3.6).
11.4.2.3.2 CURRENT FLIGHT PLAN (CPL) MESSAGES
11.4.2.3.2.1 Unless basic flight plan data have already
been distributed (FPL or RPL) which will be supplemented by
coordination data in the estimate message, a CPL message
shall be transmitted by each ACC to the next ACC and from
the last ACC to the aerodrome control tower at the destination
aerodrome, for each controlled flight, and for each flight
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