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Aircraft systems and instrumentsQuestion 590 of 934

How does engine failure appear on the manifold pressure gauge?

  1. It rises to match the ambient pressure
  2. It falls to zero inches of mercury
  3. It moves to the red radial line
  4. It stays at the value set before the failure
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Correct answer: It rises to match the ambient pressure

A power loss shows as an increase in manifold pressure to a value that matches the ambient pressure at that altitude.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Propeller — Adjustable-Pitch Propeller, page 166

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026