X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 10 Apr 2009 20:21:55 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3576133 for lml@lancaironline.net; Thu, 09 Apr 2009 23:24:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.136; envelope-from=Sky2high@aol.com Received: from imo-ma01.mx.aol.com (imo-ma01.mx.aol.com [64.12.78.136]) by imo-d20.mx.aol.com (v107.10) with ESMTP id RELAYIN9-a49debbd515d; Thu, 09 Apr 2009 23:24:05 -0400 Received: from Sky2high@aol.com by imo-ma01.mx.aol.com (mail_out_v40_r1.5.) id q.bc0.519a7c98 (14467) for ; Thu, 9 Apr 2009 23:24:00 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Thu, 9 Apr 2009 23:24:00 EDT Subject: Re: [LML] Re: LNC2 Aileron bellcrank bearing failure X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1239333840" X-Mailer: AOL 9.1 sub 5006 X-Spam-Flag:NO X-AOL-IP: 64.12.78.136 -------------------------------1239333840 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en Paul, You can clamp one aileron to the wing tip and shake the other one. Use= your newly assembled system as the basis for future comparison. Scott In a message dated 4/9/2009 7:25:29 P.M. Central Daylight Time, paulhershorin@bellsouth.net writes: Thanks for your reply--I took it apart today and found that the baring wa= s rotating within the holder--I had extra barings and replaced the old with= new--I bucked the rivets in and put everything back together--things are= tight now and I will be very careful to check for any play on all walk ar= ound inspections--if I have someone with me I will have them hold the stick still--I will move the ailerions for any play--if there is any play I will= tear into the problem again. Thanks for your support. Paul ____________________________________ From: "Sky2high@aol.com" To: lml@lancaironline.net Sent: Thursday, April 9, 2009 1:01:22 PM Subject: [LML] Re: LNC2 Aileron bellcrank bearing failure Paul, From your description I'm not quite sure where the failure is located. = If I remember correctly, the bell crank bearings are captured between rivete= d plates and meant to rotate in one plane only. Any deflection from that= plane is handled by the rod end bearings bolted up to the bell crank and= protected by area washers to ensure the capture of the rod ends. Typically the bell rank bearing housing rivets are squeezed rather than= bucked - squeezed rivets can be more fragile than bucked rivets 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 possibly sheared rivets since vibration is a common cause of fastener= failure. Perhaps even replace the rivets in both the left and right bell= cranks (assuming the bearings are not damaged). The method used by Lanca= ir is not unique to them - If you can find a better way, do it. That is the beauty of the experimental, amateur built certification category. Scott Krueger PS 1100 hours and no such problems. Uh, my annual condition inspection= is due this month and I will look at these bearing more closely. In a message dated 4/9/2009 6:49:57 A.M. Central Daylight Time, marv@lancair.net writes: Posted for PAUL HERSHORIN : I was returning on a flight the other day and the stick started to vibrate--I looked out at the aileron and I could see the left aileron fluttering--I= landed without any problem and started my investigation into the problem.= Upon opening up the bellcrank cover and moving the aileron the bellcrank= was pushing up and down when moving the aileron and holding the stick stationery. The bearing was twisting---my question is how have other individuals corrected this problem--the way it is designed is an accident= waiting to happen. Paul Hershorin 360--471LA -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l ____________________________________ _New Deals on Dell Netbooks - Now starting at $299_ (http://pr.atwola.com/promoclk/100126575x1220635155x1201407495/aol?redir= =3Dhttp://ad.doubleclick.net/ clk;213771973;35379628;w) **************New Deals on Dell Netbooks =E2=80=93 Now starting at $299 (A= HREF=3Dhttp://pr.atwola.com/promoclk/100126575x1220635155x1201407495/aol?r= edir=3Dhttp:%2F %2Fad.doubleclick.net%2Fclk%3B213771973%3B35379628%3Bw) -------------------------------1239333840 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Paul,
 
You can clamp one aileron to the wing tip and shake the other one.&nb= sp; Use your newly assembled system as the basis for future comparison.
 
Scott
 
In a message dated 4/9/2009 7:25:29 P.M. Central Daylight Time, paulhershorin@bellsouth.net writes:
From: "Sky2high@aol.com"= <Sky2high@aol.com>
To: lml@lancaironline.net
Sent: Thursday, April 9, 2009 1:01:22 PM
Subject: [LML] Re: LNC2 Aileron= bellcrank bearing failure

Paul,
 
From your description I'm not quite sure where the failure is located.  If I remember correctly, the bell crank bearings are capt= ured between riveted plates and meant to rotate in one plane only.  Any= deflection from that plane is handled by the rod end bearings bolte= d up to the bell crank and protected by area washers to ensure the capture of= the rod ends. 
 
Typically the bell rank bearing housing rivets are squeezed rather than bucked - squeezed rivets can be more fragile than bucke= d rivets in that they don't fill the hole as well.  
 
Were I you, I would remove and inspect the bell crank for work hard= ened and possibly sheared rivets since vibration is a common cause of fastene= r failure.  Perhaps even replace the rivets in both the left and righ= t bell cranks (assuming the bearings are not damaged).  The method used by= Lancair is not unique to them - If you can find a better way, do it.&nbs= p; That is the beauty of the experimental, amateur built certification category.
 
Scott Krueger
 
PS 1100 hours and no such problems.  Uh, my annual condition= inspection is due this month and I will look at these bearing more closely.
 
 
 
In a message dated 4/9/2009 6:49:57 A.M. Central Daylight Time, marv@lancair.net writes:
Posted for PAUL HERS= HORIN <paulhershorin@bellsouth.net>:

 I was returning on= a flight the other day and the stick started to vibrate--I
looked ou= t at the aileron and I could see the left aileron fluttering--I
landed= without any problem and started my investigation into the problem.&nbs= p;
Upon opening up the bellcrank cover and moving the aileron the bel= lcrank was
pushing up and down when moving the aileron and holding the
stick stationery.   The bearing was twisting---my= question is how have other
individuals corrected this problem--the= way it is designed is an accident
waiting to happen.
 Pau= l Hershorin
 360--471LA 

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