Discussion
Assertion (A): A powered control system still needs its hinge moments estimated accurately.
Reason (R): The actuator must be sized for the largest hinge moment in the whole flight envelope, including the worst combination of deflection, incidence and dynamic pressure.
Select the correct answer from the options below.
Answer: B
Both statements are true and the reason is the mechanism. An undersized jack will stall against the air load exactly when the pilot most needs authority, so the estimate must cover the corner cases and not merely the cruise. That is also why hinge moment measurement continues in the tunnel long after the decision to fit powered controls, and why load cases for the actuator are among the outputs of a control surface design.
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