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If you ever do have such a problem and you hear such a noise, consider yourself fortunate, because although aileron buzz usually exists in transonic airplanes, and is generally not an automatic precursor to flutter, it can precede structural failure in even an ultralight aircraft.
True, the ailerons of certificated light planes are not supposed to exhibit aileron buzz even at never-exceed speed (red line), but it can--and it has--happened.
In 1944, while flight testing the new P-80 airplane, NACA pilots reported an incident of aileron buzz and, from 1947 to 1956, there were 21 incidences of flutter involving transonic control surface buzz.