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Air Traffic Control Services – The purpose of the issue of Clearances by an Air Traffic Control Unit is to...
  • A
    prevent collision between aircraft under its control and expediting and maintaining an orderly flow of traffic.
  • B
    provide Flight Information Service and expediting and maintaining an orderly flow of traffic.
  • C
    provide advisory service and expediting and maintaining an orderly flow of traffic.
  • D
    direct traffic to the shortest routing and expediting and maintaining an orderly flow of traffic.

ICAO Annex 11
Chapter 3. Air Traffic Control Service

3.3 Operation of air traffic control service
3.3.1 In order to provide air traffic control service, an air traffic control unit shall:

a) be provided with information on the intended movement of each aircraft, or variations therefrom, and with current information on the actual progress of each aircraft;
b) determine from the information received, the relative positions of known aircraft to each other;
c) issue clearances and information for the purpose of preventing collision between aircraft under its control and of expediting and maintaining an orderly flow of traffic;
d) coordinate clearances as necessary with other units:

1) whenever an aircraft might otherwise conflict with traffic operated under the control of such other units;
2) before transferring control of an aircraft to such other units.

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