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Gfa 031an

SGS 1-35 SERIAL NUMBERS 2 TO 35

There have been two cases of flap buzz or flutter at speeds of about 60 to 70 m.p.h. In both cases it stopped by applying a small amount of flap., either positive or negative flap. It appears at this speed range the flap is not subject to any dampening airload at the '0' degree flap position.