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2.3 Part V contains the procedures applicable by air traffic control units providing aerodrome control service.
PANS-RAC (Doc 4444)
2.3.1 The procedures for operating aeronautical ground lights have been included in Part V (Section 6) since they concern mostly aerodromes. It should be noted, however, that
6.1.1 applies to all aeronautical ground lights, whether or not they are on or in the vicinity of an aerodrome, and that the whole of Section 6 applies to all aerodromes, whether or not aerodrome control service is provided.
2.4 Part VI contains procedures applicable by air traffic services units using radar in the performance of their functions.
2.5 Part VII contains the procedures applicable by air traffic services units providing flight information service and alerting service.
2.6 Part VIII contains procedures regarding the co-ordination to be effected between air traffic services units, between control positions within such units, and between such units and associated aeronautical telecommunication stations.
2.7 Part IX deals with air traffic services messages which are necessary for the effective operation of air traffic services.
2.8 Part X contains typical phraseologies to be used in the provision of air traffic services, arranged in groups to relate to the particular phase of air traffic services with which they are generally employed.
2.9 Part XI contains procedures concerning controller-pilot data link communications (CPDLC). The associated CPDLC message set is contained in Appendix 5.
ALLOCATION OF RESPONSIBILITY IN THE PROVISION OF AIR TRAFFIC SERVICES
3.  Responsibility for the provision of air traffic control service
3.1 Area control service shall be provided:
a)  by an area control centre; or
b)  by the unit providing approach control service in a control zone or in a control area of limited extent
2-1
which is designated primarily for the provision of approach control service, when no area control centre is established.
3.2 Approach control service shall be provided:
a)  by an aerodrome control tower or an area control centre, when it is necessary or desirable to combine under the responsibility of one unit the functions of the approach control service and those of the aerodrome control service or the area control service; or
b)  by an approach control office, when it is necessary or desirable to establish a separate unit.

3.3 Aerodrome control service shall be provided by an aerodrome control tower.
4. Responsibility for the provision of
flight information service and alerting service

4.1 Flight information service and alerting service shall be provided as follows:
a)  within a flight information region: by a flight information centre, unless the responsibility for providing such services is assigned to an air traffic control unit having adequate facilities for the exercise of such responsibilities;
b)  within controlled airspace and at controlled aerodromes: by the relevant air traffic control units.
5. Division of responsibility for control between air traffic control units
5.1 Between a unit providing aerodrome control service and a unit providing approach control service

5.1.1 Except for flights which are provided aerodrome control service only, the control of arriving and departing controlled flights shall be divided between units providing aerodrome control service and units providing approach control service as follows:
5.1.1.1 Arriving aircraft. The responsibility for the control of an aircraft approaching to land shall be transferred from the unit providing approach control service to the unit providing aerodrome control service when the aircraft:
a)  is in the vicinity of the aerodrome, and
i)  it is considered that approach and landing will be completed in visual reference to the ground, or
　
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