Discussion
Assertion (A): A gyro with a failing vacuum pump is more dangerous than one that has stopped entirely.
Reason (R): Precession rate rises as angular momentum falls, so the indication degrades while remaining plausible.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the mechanism. As the rotor slows, angular momentum falls and precession rate for a given torque rises, so the instrument drifts increasingly fast.
The danger is that the display still looks like an attitude indicator: it moves smoothly and shows a plausible attitude, so a pilot may follow it into an unusual attitude. A gyro that has stopped shows an obviously wrong indication and is recognised at once, which is why a vacuum failure warning is fitted.
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