Rules of the Air and Air Traffic Services(95)

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4.2.13 In cases where a portion of a control area is so situated that the time taken by aircraft to traverse it does not permit the application of control by the centre concerned, agreement should be reached to provide for direct transfer between the centres responsible for the adjacent control areas, provided that the intermediate centre is fully informed of such traffic; it may also require the other centres to comply with any necessary requests to obviate interference with its own traffic.
4.2.14 In the case where a flight ceases to be operated as a controlled flight, i.e. by leaving controlled airspace or by cancelling its IFR flight and proceeding on VFR in airspace where VFR flights are not controlled, the area control centre concerned shall ensure that appropriate information on the flight is forwarded to ATS unit(s) responsible for the provision of flight information and alerting services for the remaining portion of the flight, in order to ensure that such services will, in fact, be provided to the aircraft.
4.3 Co-ordination between a unit providing area control service and a unit providing approach control service

4.3.1 Division of control
4.3.1.1 A unit providing approach control service may issue air traffic control clearances to any aircraft released to it by an area control centre without reference to the area control centre, except that when an approach has been missed the area control centre shall be advised immediately and subsequent action co-ordinated between the area control centre and the unit providing approach control service.
4.3.1.2 Time of take-off shall be specified by the area control centre when it is necessary to:
a)  co-ordinate the departure with traffic not released to the unit providing approach control service; and
b)  provide en-route separation between departing aircraft following the same route.

4.3.1.2.1 If time of take-off is not specified, the unit providing approach control service shall determine the take-off time when necessary to co-ordinate the departure with traffic released to it.
4.3.1.3 A clearance expiry time shall be specified by the area control centre if a delayed departure would conflict with traffic not released to the unit providing approach control service. If, for traffic reasons of its own, a unit providing approach control service has to specify in addition its own clearance expiry time, this shall in no case be later than that specified by the area control centre.
4.3.1.4 When weather conditions require an approach sequence, the area control centre shall clear arriving aircraft to the holding point, including holding instructions and expected approach time in such clearance. If the approach sequence is such that succeeding arrivals would be required to hold at high levels, such arrivals should be cleared to other points until lower levels are vacated in the approach sequence.
4.3.1.5 After co-ordination with the unit providing approach control service, the area control centre may clear the first arriving aircraft for approach rather than to a holding point.
4.3.1.6 After co-ordination with the unit providing approach control service, the area control centre may clear arriving aircraft to visual holding points to hold until further advised by the unit providing approach control service.
4.3.1.7 Any additional procedures necessary for proper co-ordination with reference to individual aerodromes shall be contained in local written instructions approved by the appropriate ATS authority. Where an approach control office is established, an area control centre may, after co-ordination with such office, release aircraft directly to aerodrome control towers if the entire approach will be made under visual meteorological conditions.
4.3.2 Exchange of movement and control data
4.3.2.1 From the unit providing approach control service to the area control centre. The unit providing approach control service shall keep the area control centre promptly advised of pertinent data on controlled traffic such as:
　
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