Discussion
Arrange these events after a pitot inlet ices over with the drain also blocked:
1. Total pressure is trapped at its value at the time of blockage
2. The aircraft climbs and static pressure falls
3. The pressure difference across the capsule grows
4. Indicated airspeed rises although the aircraft has not accelerated
5. The crew misinterprets the reading as an overspeed
Select the correct sequence.
Answer: B
Correct answer: 1, 2, 3, 4, 5
With both the inlet and the drain blocked, the total pressure in the line is sealed at whatever it was at the moment of blockage. As the aircraft climbs the static pressure falls, so the difference across the capsule grows even though the aircraft has not accelerated, and the indicated airspeed rises. Read as a genuine overspeed it invites a pitch-up that can approach the stall - a sequence that has caused fatal accidents.
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