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A pitot tube blocked at both the inlet and the drain causes the airspeed indicator to

  • A.Read high in a climb and low in a descent
  • B.Read zero at all times
  • C.Read correctly but with lag
  • D.Read high in a descent only

Answer: A

The trapped total pressure stays constant while static pressure falls with altitude, so the differential grows as the aircraft climbs. The instrument then behaves as a crude altimeter, which is the classic icing signature.

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