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A blocked pitot tube with the drain hole clear will cause the airspeed indicator to

  • A.Read high in a climb
  • B.Read high in a descent
  • C.Freeze at its current value
  • D.Read zero

Answer: D

With the ram inlet blocked and the drain open, the pitot line vents to static pressure and the differential collapses. If instead both the inlet and the drain are blocked, the trapped pressure makes the instrument behave like an altimeter.

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