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The alternate static source in an unpressurised aircraft usually vents to

  • A.The engine intake
  • B.Ambient air at the wing tip
  • C.The cabin interior
  • D.The pitot line

Answer: C

Cabin pressure is slightly below ambient because of flow over the fuselage, so the altimeter typically reads slightly high and the airspeed slightly high when it is selected. The flight manual tabulates the correction for exactly that reason.

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