SACAA ATPL Instruments Practice Questions - SACAA Airline Transport Pilot Licence (Aeroplane) Instruments & Electronics Examination Exam

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If both the pitot inlet and the pitot drain hole become completely frozen and sealed at 10,000 ft, what happens to the ASI reading during a descent to sea level at a constant true airspeed?

The ASI will overread (indicate higher speed) in the descent. The ASI will underread (indicate lower speed) in the descent. The ASI reading will remain completely unchanged throughout the descent. The ASI will immediately drop to zero and stay at zero.

Correct Answer:

The ASI will underread (indicate lower speed) in the descent.

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