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Equivalent airspeed differs from calibrated airspeed by a correction for

  • A.Air density
  • B.Position error
  • C.Instrument friction
  • D.Compressibility of the air

Answer: D

At low speed and low altitude the correction is negligible, which is why it is often ignored in light aircraft work. It grows quickly above about 200 knots and at altitude, where the air can no longer be treated as incompressible.

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