Instrumentationhard#403
If the pitot tube AND its drain hole are both blocked, the ASI will act like:
A
A Mach meter
B
A VSI
C
An altimeter — reading increases in a climb and decreases in a descent
CorrectD
A turn coordinator
Explanation
Trapped pitot pressure is constant; as static pressure decreases in a climb the differential increases, so ASI over-reads (and vice versa).
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