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One of the functions ensured by a radar control unit for the provision of approach control service is:
  • A
    to conduct surveillance and precision radar approaches.
  • B
    To apply a reduced vertical separation of 500 feet between IFR flights and VFR flights.
  • C
    To provide instructions in order to reduce separations minima, if accepted by the pilots.
  • D
    to apply a horizontal separation less then 5 NM.

ICAO Doc 4444
8.9 USE OF ATS SURVEILLANCE SYSTEMS IN THE APPROACH CONTROL SERVICE
8.9.6 Radar approaches
8.9.6.1 GENERAL PROVISIONS

8.9.6.1.1 During the period that a controller is engaged in giving surveillance radar or precision radar approaches, he or she should not be responsible for any duties other than those directly connected with such approaches.

8.9.6.1.2 Controllers conducting radar approaches shall be in possession of information regarding the obstacle clearance altitudes/heights established for the types of approach to be conducted.

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