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INRAT Instrument Rating · Question

What is the primary indicator of a pitot tube blockage (ice) during an IFR climb?

A blocked pitot tube (but clear static port) will cause the airspeed indicator to behave like an altimeter – showing increasing airspeed in a climb and decreasi

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Question: What is the primary indicator of a pitot tube blockage (ice) during an IFR climb?

Answer options:

  • The altimeter will show a rapid decrease in altitude. ✅ The airspeed indicator will become stuck or indicate zero.
  • The vertical speed indicator will show a continuous maximum descent.
  • The attitude indicator will tumble.

Correct answer: The airspeed indicator will become stuck or indicate zero.

Explanation: A blocked pitot tube (but clear static port) will cause the airspeed indicator to behave like an altimeter – showing increasing airspeed in a climb and decreasing airspeed in a descent. If fully blocked, it could become stuck.

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