Discussion
A prototype's elevator becomes progressively lighter as the pilot pulls further, and beyond a large deflection the column tends to pull itself back.
The diagnosis is
Answer: C
A force gradient that lightens and then reverses is overbalance: \( C_{h_\delta} \) has gone positive at large deflection, so the surface drives itself further from neutral. The fix is to reduce the balance, often by trimming the horn or reducing the set-back. Insufficient mass balance shows up as flutter, not as a force reversal. A tab at full travel limits trim rather than reversing gradient. Gearing scales the force uniformly and cannot reverse its sign.
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