: I was returning on a flight the other day and the stick started to=20 vibrate--I=20 looked out at the aileron and I could see the left aileron fluttering--I=20 landed without any problem and started my investigation into the problem. =20 Upon opening up the bellcrank cover and moving the aileron the bellcrank wa= s=20 pushing up and down when moving the aileron and holding the =20 stick stationery. The bearing was twisting---my question is how have othe= r=20 individuals corrected this problem--the way it is designed is an accident=20 waiting to happen. Paul Hershorin 360--471LA=20 -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html **************New Deals on Dell Netbooks =E2=80=93 Now starting at $299 (A=20 HREF=3Dhttp://pr.atwola.com/promoclk/100126575x1220635155x1201407495/aol?red= ir=3Dhttp:%2F%2Fa d.doubleclick.net%2Fclk%3B213771973%3B35379628%3Bw) -------------------------------1239285346 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Paul,

From your description I'm not quite sure where the failure is=20 located. If I remember correctly, the bell crank bearings are captured= =20 between riveted plates and meant to rotate in one plane only. Any=20 deflection from that plane is handled by the rod end bearings bolted up= to=20 the bell crank and protected by area washers to ensure the capture of the ro= d=20 ends.

Typically the bell rank bearing housing rivets are squeezed=20 rather than bucked - squeezed rivets can be more fragile than bucked ri= vets=20 in that they don't fill the hole as well.

Were I you, I would remove and inspect the bell crank for work hardened= and=20 possibly sheared rivets since vibration is a common cause of fastener=20 failure. Perhaps even replace the rivets in both the left and right be= ll=20 cranks (assuming the bearings are not damaged). The method used by Lan= cair=20 is not unique to them - If you can find a better way, do it. That is t= he=20 beauty of the experimental, amateur built certification category.

Scott Krueger

PS 1100 hours and no such problems. Uh, my annual condition=20 inspection is due this month and I will look at these bearing more=20 closely.

In a message dated 4/9/2009 6:49:57 A.M. Central Daylight Time,=20 marv@lancair.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

Posted for PAUL HERSHORIN=20 <paulhershorin@bellsouth.net>:

I was returning on a fli= ght=20 the other day and the stick started to vibrate--I
looked out at the=20 aileron and I could see the left aileron fluttering--I
landed without=20= any=20 problem and started my investigation into the problem.
Upon open= ing=20 up the bellcrank cover and moving the aileron the bellcrank was
pushin= g up=20 and down when moving the aileron and holding the=20
stick stationery. The bearing was twisting---my quest= ion=20 is how have other
individuals corrected this problem--the way it is=20 designed is an accident
waiting to happen.
Paul=20 Hershorin
360--471LA

--

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