Discussion
Which of the following would not change the difference between indicated and true airspeed?
Answer: B
Correct answer: A change in wind velocity
Wind carries the entire air mass, so an aircraft flying in it experiences exactly the same relative flow as one in still air - every air data quantity is unchanged, and only the ground speed differs. Density, altitude and temperature all alter the relation between the two airspeeds, because all three change the air density the instrument was calibrated against.
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