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540 - ATPL Question Bank in English - For a conventional, unaided civil-aircraft INS whose full navigation alignment uses a stationary ground procedure, full alignment of the stable platform:

Question 540 - General Navigation - ATPL - Airline Transport Pilot Licence

Is only possible on the ground when the aircraft is at a complete stop
May be carried out at any time so long as an accurate position is inserted into the system.
May be carried out on the ground or when in straight and level flight
May be carried out during any phase of flight

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