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A pitot inlet blocked with the drain hole clear makes the airspeed indication fall towards __________.

  • A.the stall speed
  • B.its previous value
  • C.zero
  • D.the never exceed speed

Answer: C

The pitot line vents through the drain to static pressure, so the differential across the capsule collapses. If the drain is blocked as well, the trapped pressure instead makes the instrument behave like a crude altimeter.

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