I have had this problem intermittently for the past year or so, but now it is becoming a regular occurrence. When I go above 160KIAS I get a loud buzzing sound throughout the airframe. I cannot feel it through the control stick. I can make the buzz stop by loading the wing slightly with g’s or by extending the flaps about ¾”.

 

There is a line of rub marks on the top side of the flaps where they meet the trailing edge wing skin. I initially thought the skin was vibrating since it is fairly flexible there, but now I’m not so sure. If I partially extend the flaps on the ground I can feel a fair amount of up-and-down play in the flap hinges. I haven’t had a chance to disassemble the hinge pin yet.

 

Has anyone else had this problem? If so, what was the cause and how did you fix it?

 

Thanks,

Adam Molny

Legacy N181AM, 240 hrs