Discussion
A spring tab is fitted to
Answer: B
A spring tab links the tab to the control run through a spring, so at low speed the spring is stiff relative to the hinge moment and the surface moves directly, while at high speed the spring deflects and the tab does more of the work. The result is balance that increases with dynamic pressure, which is exactly where it is needed. It is not a flutter device, not a trimmer, and not a gust lock, though a gust lock is a real and separate fitting.
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