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Arrange the airspeed corrections in the order they are applied:

1. Indicated airspeed as read from the instrument

2. Calibrated airspeed after instrument and position error

3. Equivalent airspeed after compressibility

4. True airspeed after density

Select the correct sequence.

  • A.2, 1, 3, 4
  • B.1, 2, 4, 3
  • C.1, 2, 3, 4
  • D.1, 3, 2, 4

Answer: C

Each step removes one distinct physical effect, and the order is fixed because compressibility is defined relative to calibrated airspeed. Applying density before compressibility gives a wrong answer at high speed and altitude.

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