whichever is the earlier.
Note.— Even though there is an approach control office, control of certain flights may be transferred directly from an area control centre to an aerodrome control tower and vice versa, by prior arrangement between the units concerned for the relevant part of approach control service to be provided by the area control centre or the aerodrome control tower, as applicable.
5.1.1.2 Departing aircraft. The responsibility for control of a departing aircraft shall be transferred from the unit providing aerodrome control service to the unit providing approach control service:
a) when visual meteorological conditions prevail in the vicinity of the aerodrome:
i) prior to the time the aircraft leaves the vicinity of the aerodrome, or
ii) prior to the aircraft entering instrument meteorological conditions,
whichever is the earlier;
b) when instrument meteorological conditions prevail at the aerodrome:
i) immediately before the aircraft enters the runway-in-use for take-off, or
ii) immediately after the aircraft is airborne, if local procedures render such action preferable.
Note.— See Note following 5.1.1.1.
II. General Provisions
5.2 Between a unit providing approach control service and a unit providing area control service
5.2.1 When area control service and approach control service are not provided by the same air traffic control unit, responsibility for controlled flights shall rest with the unit providing area control service except that a unit providing approach control service shall be responsible for the control of:
a) arriving aircraft that have been released to it by the area control centre;
b) departing aircraft until such aircraft are released to the area control centre.
5.2.1.1 Under approach sequence conditions the unit providing area control service shall normally be responsible for clearing aircraft to the holding point, and for including holding instructions and expected approach time in such clearances.
5.2.1.2 A unit providing approach control service shall assume control of arriving aircraft, provided such aircraft have been released to it, upon arrival of the aircraft at the point agreed for transfer of control, and shall maintain control during approach to the aerodrome.
5.2.1.3 The control of more than one approach sequence may be effected by a unit providing approach control service, provided the division of control between the unit providing area control service and the unit providing approach control service is defined in instructions approved by the appropriate ATS authority and is basically consistent with the foregoing procedures.
6. Responsibility in regard to military traffic
6.1 It is recognized that some military aeronautical operations necessitate non-compliance with certain air traffic procedures. In order to ensure the safety of flight operations the appropriate military authorities shall be asked, whenever practicable, to notify the proper air traffic control unit prior to undertaking such manoeuvres.
6.2 A reduction of separation minima required by military necessity or other extraordinary circumstances shall only be accepted by an air traffic control unit when a specific
2-3
request in some recorded form has been obtained from the authority having jurisdiction over the aircraft concerned and the lower minima then to be observed shall apply only between those aircraft. Some recorded form of instruction fully covering this reduction of separation minima must be issued by the air traffic control unit concerned.
6.3 Temporary airspace reservation, either stationary or mobile, may be established for the use of large formation flights or other military air operations. Arrangements for the reservation of such airspace shall be accomplished by co-ordination between the user and the appropriate ATS authority. The co-ordination shall be effected in accordance with the provisions of Annex 11 and completed early enough to permit timely promulgation of information in accordance with the provisions of Annex 15.
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