4.2.3.6.1 An LAM message shall be used only between ATC computers.
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 appro-priate controller.
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.
4.2.4 Supplementary messages
4.2.4.1 Supplementary messages comprise:
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request flight plan messages (4.2.4.2)
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request supplementary flight plan messages (4.2.4.3)
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supplementary flight plan messages (4.2.4.4).
4.2.4.2 Request flight plan (RQP) messages
4.2.4.2.1 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 RTF communications and requires air traffic services, the RQP message shall be transmitted to the previous ATS unit along the route of flight.
4.2.4.3 Request supplementary flight plan (RQS)
messages
4.2.4.3.1 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.
4.2.4.4 Supplementary flight plan (SPL) messages
Note.— Instructions for the transmission of an SPL are contained in Appendix 2.
4.2.4.4.1 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.
4.2.5 Control messages
4.2.5.1 Control messages comprise:
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clearance messages (4.2.5.2)
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transfer of control messages (4.2.5.3)
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flow control messages (4.2.5.4)
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position report and air-report messages (4.2.5.5).
4.2.5.2 Clearance messages
Note.— Provisions governing clearances are contained in Part II, Section 10, and Part III, Sections 10 to 13. 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.
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.
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