Discussion
Why must a control surface be re-balanced after repainting or repair?
Answer: B
Even a thin layer of filler or paint aft of the hinge moves the surface's centre of gravity aft and can reduce the flutter margin, which is why maintenance manuals specify balance checks after such work and set limits on permissible added mass. The aerodynamic derivatives are essentially unchanged by paint. Tab settings are checked separately as part of rigging. And the area change is negligible; it is the mass distribution that matters.
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