flight instrumentsFAA-published sample question (PAR, Aug 2021)
Deviation error of the magnetic compass is caused by
A
a northerly turning error.
B
certain metals and electrical systems within the aircraft.✓ Correct Answer
C
the difference in location of true north and magnetic north.
Explanation
Deviation is compass error caused by magnetic fields from metal parts and electrical equipment inside the aircraft, and it is recorded on the compass correction card (PHAK Ch. 8). The angular difference between true north and magnetic north is variation, a different error. Northerly turning error is a dip-related error that shows up in turns.
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