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A pitot tube blocked at the inlet with the drain clear makes the airspeed rise in a climb. Is this correct?

  • A.Yes, but only above the transition altitude
  • B.No, the reading stays at its last value
  • C.No, the line vents through the drain and the reading falls to zero
  • D.Yes, trapped pressure makes it rise

Answer: C

Venting through the drain collapses the differential across the capsule. The rising indication belongs to the case where the drain is blocked as well, which traps the total pressure and turns the instrument into a crude altimeter.

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