FAA AMT Airframe Practice Exam 2025 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

Question: 1 / 1030

Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by mechanics?

Variation

Deviation

The correct answer is B. Deviation. Deviation is the error caused by electrical and magnetic fields within the aircraft affecting the magnetic compass. Mechanics can compensate for deviation by installing correctors such as magnets or other devices to counteract the errors caused by these internal influences. Variation (A) is the angular difference between true north and magnetic north, which cannot be compensated for by mechanics. Dip (C) is the error caused when the compass card is not level due to the magnetic field of the Earth, and Northerly turning error (D) is the tendency of the compass to initially indicate a turn in the opposite direction when flying from a heading of north. Mechanics cannot directly compensate for variation, dip, or northerly turning error.

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Dip

Northerly turning error

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