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

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If the pitot tube becomes completely blocked by ice while its drain hole remains open, what will the Airspeed Indicator (ASI) display during level flight?

The ASI will drop to zero because pitot pressure leaks out through the drain hole. The ASI will freeze at its current reading regardless of changes in airspeed. The ASI will act as an altimeter, indicating an increase in airspeed during a climb. The ASI will indicate an overspeed when accelerating at constant altitude.

Correct Answer:

The ASI will drop to zero because pitot pressure leaks out through the drain hole.

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