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11.4.2.3.5.2 Either the accepting unit or the transferring
unit shall transmit an ACP message to indicate that data
received in a CDN message is accepted and that the
coordination process is completed.
11.4.2.3.6 LOGICAL ACKNOWLEDGEMENT
11.4.2.3.6 (LAM) MESSAGES
11.4.2.3.6.1 An LAM message shall be used only
between ATC computers.
11.4.2.3.6.2 An ATC computer shall transmit an LAM
message in response to a CPL or EST or other appropriate
message which is received and processed up to the point
where the operational content will be received by the appropriate
controller.
11.4.2.3.6.3 The transferring centre shall set an
appropriate reaction time parameter when the CPL or EST
message is transmitted. If the LAM message is not received
within the parameter time, an operational warning shall be
initiated and reversion to telephone and manual mode shall
ensue.
11.4.2.4 SUPPLEMENTARY MESSAGES
11.4.2.4.1 Supplementary messages comprise:
— request flight plan messages (11.4.2.4.2)
— request supplementary flight plan messages
(11.4.2.4.3)
— supplementary flight plan messages (11.4.2.4.4).
11.4.2.4.2 REQUEST FLIGHT PLAN (RQP) MESSAGES
A request flight plan (RQP) message shall be transmitted when
an ATS unit wishes to obtain flight plan data. This might occur
upon receipt of a message concerning an aircraft for which no
corresponding basic flight plan data had been previously
received. The RQP message shall be transmitted to the
transferring ATS unit which originated an EST message, or to
the centre which originated an update message for which no
corresponding basic flight plan data are available. If no
message has been received at all, but an aircraft establishes
radiotelephony (RTF) communications and requires air traffic
services, the RQP message shall be transmitted to the previous
ATS unit along the route of flight.
11.4.2.4.3 REQUEST SUPPLEMENTARY FLIGHT PLAN
11.4.2.4.3 (RQS) MESSAGES
A request supplementary flight plan (RQS) message shall be
transmitted when an air traffic services unit wishes to obtain
supplementary flight plan data. The message shall be
transmitted to the air traffic services reporting office at the
departure aerodrome or in the case of a flight plan submitted
during flight, to the air traffic services unit specified in the
flight plan message.
11.4.2.4.4 SUPPLEMENTARY FLIGHT PLAN
11.4.2.4.4 (SPL) MESSAGES
Note.— Instructions for the transmission of an SPL are
contained in Appendix 2.
An SPL message shall be transmitted by the air traffic services
reporting office at the departure aerodrome to air traffic
services units requesting information additional to that already
transmitted in a CPL or FPL message. When transmitted by
the AFTN, the message shall be assigned the same priority
indicator as that in the request message.
11-10 Air Traffic Management (PANS-ATM)
1/11/01
11.4.2.5 CONTROL MESSAGES
11.4.2.5.1 Control messages comprise:
— clearance messages (11.4.2.5.2)
— transfer of control messages (11.4.2.5.3)
— flow control messages (11.4.2.5.4)
— position report and air-report messages (11.4.2.5.5).
11.4.2.5.2 CLEARANCE MESSAGES
Note.— Provisions governing clearances are contained in
Chapter 4, Section 4.5. The following paragraphs set forth the
contents of clearance messages together with certain procedures
relating to the transmission thereof. Specifications
regarding the formats and data conventions to be used have
not yet been developed by ICAO.
11.4.2.5.2.1 Clearances shall contain the following in the
order listed:
a) aircraft identification;
b) clearance limit;
c) route of flight;
d) level(s) of flight for the entire route or part thereof and
changes of levels if required;
Note.— If the clearance for the levels covers only
part of the route, it is important for the air traffic
control unit to specify a point to which the part of the
clearance regarding levels applies whenever necessary
to ensure compliance with 3.6.5.2.2 a) of Annex 2.
e) any necessary instructions or information on other
matters such as SSR transponder operation, approach
or departure manoeuvres, communications and the
time of expiry of the clearance.
Note.— The time of expiry of the clearance
indicates the time after which the clearance will be
automatically cancelled if the flight has not been
started.
11.4.2.5.2.2 Instructions included in clearances relating
to levels shall consist of:
a) cruising level(s) or, for cruise climb, a range of
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