ATPL 022 Instrumentation Practice Questions - EASA ATPL(A) Theoretical Knowledge - Aircraft General Knowledge Instrumentation (Subject 022) Exam

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An airspeed indicator is calibrated for ISA mean sea level conditions. At high altitude where the air density is much lower than at sea level, how does the indicated airspeed (IAS) relate to the true airspeed (TAS) for a given dynamic pressure?

IAS equals TAS at all altitudes because the instrument is density-compensated. IAS is lower than TAS because the lower density means TAS must be higher for the same dynamic pressure. IAS is greater than TAS because the capsule expands more at altitude. IAS exceeds TAS by the amount of the compressibility correction only.

Correct Answer:

IAS is lower than TAS because the lower density means TAS must be higher for the same dynamic pressure.

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