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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.

Leaving NAT HLA by descent below FL 285/FL 290 as appropriate, using contingency procedures if required.

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

Applying SLOP only and maintaining the original clearance indefinitely.

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