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With the engine stopped on the ground, the manifold pressure gauge should read

  • A.The value set on the altimeter subscale
  • B.Maximum scale deflection
  • C.Approximately ambient atmospheric pressure
  • D.Zero

Answer: C

Because the gauge measures absolute pressure, a stationary engine leaves the manifold open to ambient. A reading far from local pressure at rest is one of the simplest pre-flight checks that the instrument is serviceable.

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