Pressure instruments · Question 11 of 12
The pitot tube and its drain hole are blocked by ice; the static port is clear. How does the airspeed indicator behave?
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Answer
- B It shows more airspeed in a climb and less in a descent
Explanation
The pressure remains trapped in the pitot tube. When the aeroplane climbs, the static pressure falls, the difference grows, and the airspeed indicator shows more – it works like an altimeter. If only the inlet is blocked and the drain is open, the pressure escapes and the indication drops towards zero.