Discussion
Assertion (A): A directional gyro is realigned against the magnetic compass in steady level flight only.
Reason (R): The magnetic compass is unreliable during turns and accelerations.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the reason for the restriction. The magnetic compass suffers turning error, worst on northerly and southerly headings, and acceleration error, worst on east and west - both arising from the magnet's dip and pendulous mounting.
Its indication is therefore trustworthy only in steady level unaccelerated flight, and that is when the directional gyro may be set from it. Aligning during a turn would transfer the compass's error into the gyro.
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