3.6.1 Filed flight plan data and associated update messages shall be addressed simultaneously to the first en-route control centre, to all other ATS units along the route of flight which are unable to obtain or process current flight plan data, and to air traffic flow management units concerned.
3.7 Co-ordination and transfer data
3.7.1 Progression of a flight between successive control sectors and/or control centres shall be effected by a co-ordination and transfer process comprising the following stages:
a) the announcement of the flight and the proposed conditions of transfer of control; and
b) co-ordination of the conditions of transfer and acceptance followed by the assumption of control by the receiving unit.
3.7.2 The announcement of the flight shall be by a current flight plan message containing all relevant ATS data or by an estimate message containing the proposed conditions of transfer. An estimate message shall be used only when updated basic flight plan data is already available at the receiving ATS unit.
3.7.3 A receiving ATS unit to whom the proposed conditions of transfer are not acceptable shall decline to accept the aircraft as proposed and shall initiate further co-ordination by proposing alternative acceptable conditions.
3.7.4 The co-ordination process shall be considered to be completed as soon as the proposed conditions contained in the current flight plan message, or in the estimate message or in one or more counter-proposals, are accepted by an oper-ational or logical procedure.
IX. Air Traffic Services Messages
3.7.5 Unless an operational acknowledgement is received, a logical acknowledgement message shall be auto-matically transmitted by the receiving computer in order to ensure the integrity of the co-ordination 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.
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.
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 co-ordination data, further co-ordination shall normally not be required. However, acceptance shall be required.
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.
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.
3.8 Supplementary data
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 4.2.4.2.1 and 4.2.4.3.1 for ATS units to which request messages shall be addressed.
3.8.2 If the requested information is available, a filed or a supplementary flight plan message shall be transmitted.
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