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454 - ATPL - An aircraft's compass must be swung:

Question 454 - General Navigation - ATPL - Airline Transport Pilot license

If the aircraft has been in the hangar for a long time and has been moved several times.
After a change of theatre of operations at the same magnetic latitude.
If the aircraft has been subjected to a hammering.
Every maintenance inspection.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license