A general aviation airplane is flying at an altitude of 5000 m. The indicated airspeed is 250 km/h. Assume that there are no instrument errors and position errors. Neglecting compressibility effects, which one of the following options is FALSE?
Show Hint
- The true airspeed is greater than 250 km/h.
- The calibrated airspeed is 250 km/h.
- The true airspeed is 250 km/h.
- The equivalent airspeed is 250 km/h
The Correct Option is C
Solution and Explanation
The true airspeed is higher than the indicated airspeed because air density decreases with altitude.
Calibrated airspeed (CAS) is corrected for instrument and position errors and is assumed to be the same as IAS in this case.
Equivalent airspeed (EAS) is related to CAS and air density, and at altitude, it can differ from IAS as well.
Hence, the false statement is (C): The true airspeed is 250 km/h, because at 5000 m altitude, the true airspeed is greater than the indicated airspeed.
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