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469 - ATPL Question Bank in English - An aircraft subjected to unlawful interference has to leave its assigned track or cruising level and cannot establish communication with ATS. If no applicable regional contingency procedure has been published, the pilot-in-command should:

Question 469 - Air Law - ATPL - Airline Transport Pilot Licence

Immediately descend to the lowest safe altitude and land at the nearest suitable aerodrome.
Continue exactly on the filed flight plan route and level until communication with ATS is restored.
Use an offset of 500 ft from the normal IFR cruising levels where the vertical separation minimum is 1,000 ft, or 1,000 ft where that minimum is 2,000 ft
Squawk 7700 and follow the semicircular cruising level system without any offset.

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