Instrumentationmedium#402
If the pitot tube becomes blocked but the drain hole remains clear, the ASI will:
A
Over-read in a climb, under-read in a descent
B
Read zero
CorrectC
Freeze at the speed when the blockage occurred
D
Continue to read normally
Explanation
With a blocked pitot and clear drain, pitot pressure bleeds to ambient; the ASI reads zero as total pressure equals static.
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