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INRAT Instrument Rating · Question

A typical pitot-static system failure caused by a blocked pitot tube and clear drain hole would affect which instruments?

A blocked pitot tube, with the drain hole clear, affects only the airspeed indicator. The altimeter and vertical speed indicator rely on the static port alone,

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Question: A typical pitot-static system failure caused by a blocked pitot tube and clear drain hole would affect which instruments?

Answer options: ✅ Airspeed indicator only.

  • Altimeter and vertical speed indicator.
  • All three: airspeed indicator, altimeter, and vertical speed indicator.
  • Attitude indicator and turn coordinator.

Correct answer: Airspeed indicator only.

Explanation: A blocked pitot tube, with the drain hole clear, affects only the airspeed indicator. The altimeter and vertical speed indicator rely on the static port alone, which would remain functional.

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