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Statement I: Trimming reduces the stick force to zero rather than the elevator deflection.

Statement II: The elevator is generally deflected at the trimmed condition.

In the light of the above statements, choose the correct answer.

  • A.Both Statement I and Statement II are incorrect
  • B.Statement I is correct but Statement II is incorrect
  • C.Statement I is incorrect but Statement II is correct
  • D.Both Statement I and Statement II are correct

Answer: D

Correct answer: Both Statement I and Statement II are correct

Both are true and the second follows from the first. Trimming adjusts a tab or the tailplane incidence so that the aerodynamic hinge moment is balanced and the pilot need hold no force - it does not centre the elevator.

At most trimmed conditions the elevator is deflected, often several degrees, because a download is needed to balance the wing's pitching moment. This is why a trim change with configuration or speed is felt as a force to be trimmed out rather than as the surface returning to neutral.

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