During first flight with motor glider wings when speedbrakes were
unlocked, brakes floated partially open. This, of course, is normal.
However, occasionally at speeds btween 60 and 100 knots, the entire
assembly would vibrate or shutter light to moderately as felt on the
handle and visually evident on the speedbrakes themselves. Shutter
frequency was much lower than the buzz of flutter and slight movement of
the handle in either direction would stop the vibration.
Suspect looseness in linikage or brake surface anomaly could be the
cause. Anyone experience this and what was the fix?
Bob Lindsay, test pilot for N911XS, Ramona and Warner Springs, California
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