Discussion
The airspeed indicator reads true airspeed at all altitudes. True or false?
Answer: C
Correct answer: False, it reads true airspeed only at sea level standard density
The instrument responds to dynamic pressure and is graduated on the assumption of sea level standard density. Where the actual density is lower the same speed produces less dynamic pressure, so the reading falls below the true airspeed and the gap widens with altitude. The instrument is not density compensated; correcting for density is the pilot’s or the air data computer’s task.
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