aircraft systemsFAA-published question bank (Private Pilot, 2008)
Generally speaking, the use of carburetor heat tends to
A
decrease engine performance.✓ Correct Answer
B
increase engine performance.
C
have no effect on engine performance.
Explanation
Carburetor heat routes warm, less dense air into the induction system, so the engine takes in less mass of air and the mixture becomes richer; PHAK notes that this decreases engine output, which shows as a drop in RPM or manifold pressure. It does not increase performance.
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