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PPL » Flight Radio » Loss of Comms - Aircraft Equipment

2.16 Loss of Communications - Aircraft Equipment

2.16.2 Describe the checks that should be followed when becoming aware of an aircraft communication system failure, including a check of:

(a) radio power source;

  • master switch is on
  • avionics switch is on
  • circuit breakers/fuses are not popped or blown


(b) function settings (frequency, squelch and similar);

  • correct frequency is selected
  • squelch function and level is set correctly
  • volume is not turned down too low
  • correct comms box is selected


(c) microphone or headset.

  • microphone and leads are correctly plugged in
  • volume on the headset is up


2.16.4 Detail the actions to be taken when experiencing loss of communications in:

(a) controlled airspace;

5.2.2 The pilot of an aircraft operating under VFR should: 

(a) not enter controlled airspace, including control zones, unless complying with:

  • a clearance already received and acknowledged; or
  • published COM failure procedures for that aerodrome.


(b) divert to an unattended aerodrome and report arrival to ATS as soon as possible;


(c) if unable to divert to an unattended aerodrome:

  • continue to operate transponder on code 7600; and
  • enter the control zone via a published arrival procedure; or
  • approach the aerodrome side-on to the main runway or runway-in-use, and carry out a standard overhead circuit joining procedure; and
  • contact ATS as soon as possible after landing.
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