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Home > Exam Questions > ATPL - Airline Transport Pilot license > Operational Procedures > If all Long Range Navigation Systems (LRNS) become unserviceable during a flight in NAT HLA and no ATC instruction is received, the crew should consider:

14 - ATPL - If all Long Range Navigation Systems (LRNS) become unserviceable during a flight in NAT HLA and no ATC instruction is received, the crew should consider:

Question 14 - Operational Procedures - ATPL - Airline Transport Pilot license

Returning to the departure aerodrome in all cases.

Climbing or descending 500 ft, broadcasting the action on 121.500 MHz and advising ATC as soon as possible.

Continuing without advising ATC if the FMS still displays the route.

Applying SLOP only and maintaining the original clearance indefinitely.

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