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ATPL » Air Law – Helicopter » Instrument Communications and Navigation Aid Failure

37.96 Communications and Navigation Aid Failure

37.96.2 Describe the procedures required following a communications failure en route. AIP ENR



3.1 Procedure 

3.1.1 In the event of a total loss of communication, an aircraft shall:

  • (a) Try to re-establish communication by all other means;
  • (b) If all attempts to re-establish communication with ATC are unsuccessful:
    • (i) squawk 7600;
    • (ii) if able, transmit blind at suitable intervals: flight identification, flight level, aircraft position (including the ATS route designator or the track code), and intentions on the frequency in use, and on frequency 121.5 MHz (or on the VHF inter-pilot air to air frequency 123.45 MHz);
    • (iii) watch for conflicting traffic both visually and by reference to airborne collision avoidance systems or traffic displays (if equipped);
    • (iv) turn on all aircraft exterior lights (commensurate with appropriate operating limitations);
    • (v) maintain the last assigned speed and level for a period of 60 minutes following the aircraft’s failure to report its position over a compulsory reporting point (including ADS-C flights), and thereafter adjust speed and level in accordance with the filed flight plan;
    • (vi) aircraft may elect to initiate strategic lateral offset procedures;
    • (vii) upon exiting oceanic airspace comply with the loss of COM procedures published for IFR Communication Failure — New Zealand FIR.
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