Discussion
Assertion (A): Control surfaces are mass balanced ahead of the hinge line.
Reason (R): Moving the surface's centre of gravity forward decouples its rotation from wing bending.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. Coupling between bending and control rotation is a classic flutter mechanism, and mass balance raises the flutter speed above the flight envelope. It is a certification requirement rather than an option.
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