Discussion
A pilot in an unpressurised aircraft selects the alternate static source after a suspected blockage. The altimeter jumps up by about 50 feet and the airspeed rises slightly.
How should this be interpreted?
Answer: D
Correct answer: As the expected effect of venting to slightly reduced cabin pressure
In an unpressurised aircraft the cabin runs slightly below ambient because of the flow over and through the airframe. Venting the static line to the cabin therefore feeds the instruments a lower pressure, which the altimeter reads as extra height and the airspeed indicator as extra speed. The shift is small and predictable, and the correction is published in the flight manual.
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