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Instrumentationhard#491

Compressibility error in the ASI becomes significant:

A

At low altitude and low speed

B

Only at sea level

C

Above approximately 200 kt and/or 10,000 ft

Correct
D

Only in a dive

Explanation

Compressibility error (CAS vs EAS) increases with speed and altitude as air can no longer be treated as incompressible.

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