2.3 This information shall be forwarded to the air traffic services unit in charge of the next flight information region in which the aircraft will operate prior to the aircraft entering such flight information region.
2.4 When so required by agreement between the appropriate ATS authorities to assist in the identification of strayed or unidentified aircraft and thereby eliminate or reduce the need for interception, flight plan and flight progress information for flights along specified routes or portions of routes in close proximity to flight information region boundaries shall also be provided to the air traffic services units in charge of the flight information regions adjacent to such routes or portions of routes.
PANS-RAC (Doc 4444)
3. Co-ordination in respect of the provision of air traffic advisory service
3.1 ATS units providing air traffic advisory service shall apply the co-ordination procedures specified in Section 4 below with respect to such aircraft having elected to use this type of service.
4. Co-ordination in respect of the provision of air traffic control service
4.1 Authority
4.1.1 Approach control offices and aerodrome control towers shall observe the co-ordination instructions issued by the appropriate area control centre. Aerodrome control towers shall, in addition, observe the co-ordination instructions issued by the appropriate approach control office.
4.2 Co-ordination between units providing area control service within contiguous control areas
4.2.1 Area control centres shall forward from centre to centre, as the flight progresses, necessary flight plan and control information.
Note.— See also 2.4.
4.2.2 The information specified in 4.2.1 shall be transmitted in sufficient time to permit reception and analysis of the data by the receiving centre and necessary co-ordination between the two centres concerned.
Note.— See Part IX and Appendix 3 for details regarding messages, their content and time of transmission.
4.2.3 If the departure aerodrome of an aircraft is not a sufficient distance from the boundary of an adjacent control area to permit transmission of the necessary flight plan and control information to the accepting centre after take-off and
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allow adequate time for reception, analysis and co-ordination, the transferring centre shall, prior to clearing the aircraft, forward the data required by 4.2.1 to the accepting centre together with a request for acceptance in accordance with
4.2.5.
4.2.3.1 In the case of an aircraft in flight requiring an initial clearance at a similar distance from the boundary of an adjacent control area, the aircraft shall be held within the transferring centre’s area until flight plan and control information can be forwarded and co-ordination can be effected with the adjacent centre.
4.2.3.2 In the case of an aircraft requesting a change in its current flight plan, or of a transferring centre proposing to change the current flight plan of an aircraft in the vicinity of the boundary in circumstances similar to that described, the revised clearance shall be withheld pending acceptance of the proposal by the adjacent centre.
4.2.4 When boundary estimate data are to be transmitted in the circumstances mentioned in 4.2.3, the time in respect of an aircraft not yet departed shall be based upon the estimated time of departure as determined by the ATC unit at the departure aerodrome. In respect of an aircraft in flight requiring an initial clearance, the time shall be based on the estimated elapsed time from the holding point to the boundary plus the time expected to be needed for co-ordination.
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