Discussion
A trim tab works by
Answer: C
Correct answer: Deflecting to give zero stick force
A trim tab is a small surface at the trailing edge of the elevator, deflected in the sense opposite to the elevator itself. Its own aerodynamic moment about the hinge cancels the elevator's, so the net hinge moment is zero and the pilot can release the column.
Note what it does not do: it does not lock the surface, reduce its area or make it more effective. The elevator remains deflected at whatever angle the condition requires - trimming zeroes the force, not the deflection.
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