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During a flight in NAT MNPS airspace at FL 390, if all long range navigation systems of an aircraft become unserviceable and if no instructions are received from the ATC within a reasonable delay, the pilot in command should consider, broadcasting on 121.5 MHz:
  • A
    climbing or descending 500 feet
  • B
    set an offset of 5 NM
  • C
    land at the nearest airport
  • D
    return to departure airport

North Atlantic Operations and Airspace Manual
NAT doc 007
12.2 LOSS OF NAVIGATION/FMS CAPABILITY

The Remaining System Fails After Entering the NAT HLA
12.2.8 The flight crew should:

a) immediately notify ATC;
b) make best use of procedures specified above relating to attempting visual sightings and establishing contact on VHF with adjacent aircraft for useful information;
c) keep a special look-out for possible conflicting aircraft, and make maximum use of exterior lights;
d) if no instructions are received from ATC within a reasonable period consider climbing or descending 500 feet, broadcasting action on 121.5 MHz and advising ATC as soon as possible.

Note: This procedure also applies when a single remaining system gives an indication of degradation of performance, or neither system fails completely but the system indications diverge widely and the defective system cannot be determined.

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