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Date: Wed, 18 Jun 2014 07:29:01 -0400
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From: Tom Thibault <tom@lachollatech.com>
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Subject: RE: Legacy flap buzz above 160kts
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Adam,

Any unintentional movement of flight controls or flaps at the hinge line 
or control linkage connections is bad juju.

 From photos of Legacy flap hinges, it looks like the spherical bearings 
are much like what we LNC2 owners have in our elevator hinges.  If so, 
those are readily available from bearing dealers.  I had to replace one 
worn out bearing in my elevator.  The number was stamped right on the 
periphery of the bearing.  Prior to replacement there was very slight 
up/down movement.  Afterward, zero.

If you have any piano hinged parts, what many of us LNC2 owners have 
done is discard the stock hinge pins and replace them with 3/32 
stainless steel welding rod.  On all my hinges, these were a very close 
fit.  Others have reported having to ream out the hinge holes to fit.  
Before doing this, my ailerons moved up/down enough to make black soot 
trails aft of the hinge.  After replacement, no more soot.

Good luck,

Tom Thibault