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What is the minimum distance a control zone shall extend from the centre of the aerodrome or aerodromes concerned in the direction from which approaches may be made?
  • A
    5 NM.
  • B
    10 NM.
  • C
    15 NM.
  • D
    7.5 NM.

ICAO Annex 11
2.9.5 Control zones

2.9.5.1 The lateral limits of control zones shall encompass at least those portions of the airspace, which are not within control areas, containing the paths of IFR flights arriving at and departing from aerodromes to be used under instrument meteorological conditions.
Note.— Aircraft holding in the vicinity of aerodromes are considered as arriving aircraft.

2.9.5.2 The lateral limits of a control zone shall extend to at least 9.3 km (5 NM) from the centre of the aerodrome or aerodromes concerned in the directions from which approaches may be made.
Note.— A control zone may include two or more aerodromes situated close together


Note: Control zone. A controlled airspace extending upwards from the surface of the earth to a specified upper limit.

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