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Which of the following is not a stage in the airspeed correction chain?

  • A.True airspeed
  • B.Ground speed
  • C.Calibrated airspeed
  • D.Equivalent airspeed

Answer: B

Correct answer: Ground speed

The chain is indicated, calibrated, equivalent, true, and each step removes one air data effect. Ground speed is not part of it: it is what you get by adding the wind vector to true airspeed, and it belongs to navigation rather than to air data. Treating it as the last link of the chain is a common and consequential confusion.

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