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Assertion (A): An air data computer removes discrepancies between separate cockpit instruments.

Reason (R): It computes every air data parameter from one set of pressure and temperature inputs.

Select the correct answer from the options below.

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

Answer: A

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the mechanism. Separate mechanical instruments each have their own calibration and their own errors, so they can disagree with one another. An air data computer takes one set of pressure and temperature inputs and derives altitude, airspeed, Mach number and vertical speed from them consistently, so the displayed values agree by construction.

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