Operations resources


Class G communications

Frequency management

Choosing the appropriate frequency to maintain a listening watch depends  on your location.

At an aerodrome that requires the use of VHF radios (see page 1.25 for this requirement), a VHF frequency will be allocated, whether 126.7 MHz or a discrete frequency (see ERSA FAC). This frequency must be monitored and transmitted on (CAR 166C) whenever you are within the vicinity of the aerodrome.

You are in the vicinity of an aerodrome if you are flying within (CAR 166-01 (4.1)):

  • airspace other than controlled airspace
  • 10 nm from the aerodrome and
  • a height above the aerodrome that could result in conflict with operations  at the aerodrome.

In the vicinity of an aerodrome, the most hazardous area for collision is within  a 5 nm radius and up to 3000 ft above the aerodrome (CAAP 166–01(4.1)). However, determining the height that could result in conflict with aerodrome operations is dependent on the type of operation (for example, gliding). Thus the height of ‘the vicinity’ may be considered to be greater than 3000 ft.

If you are operating at an aerodrome that is not published in ERSA or marked on charts, good airmanship implies that you should monitor and broadcast your intentions on the relevant area frequency (CAAP 166-01(4.1)).

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