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Assertion (A): A derivative set measured in flight is preferred over a predicted one for a simulator used in pilot training.

Reason (R): The flight-identified set carries the aeroplane's real flexibility, propulsion effects and as-built geometry.

Select the correct answer from the options below.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both statements are true and the reason is why. Prediction has to model flexibility, engine installation effects and every geometric detail, and each of those is a source of error; the flight-identified set contains them all by construction. That is why training simulators are validated against flight test data within tolerance bands, and why a predicted set is used only until flight data exists. The predicted set remains essential before first flight, when nothing else is available.

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