Discussion
An aeroplane's control column vibrates at a few cycles per second during a high-speed run, with the amplitude increasing as the speed is raised further.
What should be suspected?
Answer: D
Growing amplitude with increasing speed is the signature of flutter approaching, and the correct action is to reduce speed at once and land for inspection of the surface balance and the control run for free play. A trim runaway shows as a steady, one-way change of force rather than an oscillation. Overbalance gives a force reversal, not a vibration. Buffet is broadband and driven by separation, and it does not grow smoothly in the way an approaching flutter mode does.
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