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A trim tab is adjusted until

  • A.The hinge moment is zero at the required surface position
  • B.The surface reaches its stop
  • C.The stick force per g is at its maximum
  • D.The surface centre of gravity lies on the hinge

Answer: A

Trimming means driving the hinge moment to zero at the deflection the aeroplane needs, so the pilot can release the controls and the surface stays put. Reaching a stop is a travel limit, not a trim condition. Stick force per g is a manoeuvre characteristic that trimming does not target. And putting the centre of gravity on the hinge is mass balancing, an entirely separate operation performed on the ground with weights.

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