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186 - ATPL Question Bank in English - Which statement best describes magnetic-compass deviation in an aircraft?

Question 186 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot Licence

It is solely the angular difference between geographic north and magnetic north, independent of the aircraft
It is exclusively a temperature error of the compass liquid, with no magnetic-field contribution
It is produced only by the vertical Earth-rate component acting on a gyro rotor
It is the compass error caused by aircraft magnetic fields, including magnetized components and flowing electrical currents

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