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An ATC unit will issue clearances for the purpose of…

  • A
    achieving separation between controlled flights.
  • B
    providing a Flight Information Service.
  • C
    providing alerting services.
  • D
    providing advisory services.

ICAO Annex 11
3.3 Operation of air traffic control service

3.3.4 Clearances issued by air traffic control units shall provide separation:

a) between all flights in airspace Classes A and B;
b) between IFR flights in airspace Classes C, D and E;
c) between IFR flights and VFR flights in airspace Class C;
d) between IFR flights and special VFR flights;
e) between special VFR flights when so prescribed by the appropriate ATS authority,

except that, when requested by an aircraft and if so prescribed by the appropriate ATS authority for the cases listed under b) above in airspace Classes D and E, a flight may be cleared without separation being so provided in respect of a specific portion of the flight conducted in visual meteorological conditions.

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