Discussion
Assertion (A): A manifold pressure gauge reading ambient with the engine stopped is serviceable.
Reason (R): The instrument measures absolute rather than differential pressure.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the check. Because the gauge is referenced to vacuum, it indicates whatever pressure exists in the manifold - and with the engine stopped that is ambient, reached through the open induction system.
So a reading equal to the local altimeter setting confirms the instrument is working. A differential gauge would read zero in the same conditions, which is why the check works only for an absolute instrument. A manifold gauge reading zero or well away from ambient before start should be treated as faulty.
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