X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 09 Apr 2009 20:24:41 -0400 Message-ID: X-Original-Return-Path: Received: from web83909.mail.sp1.yahoo.com ([69.147.92.113] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with SMTP id 3575741 for lml@lancaironline.net; Thu, 09 Apr 2009 17:11:17 -0400 Received-SPF: neutral receiver=logan.com; client-ip=69.147.92.113; envelope-from=paulhershorin@bellsouth.net Received: (qmail 67089 invoked by uid 60001); 9 Apr 2009 21:10:40 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=bellsouth.net; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=BwpSv7uMh9qstdeX5Krze32v7Zza0CCkKSHTp44we4yq+KdaLfvc/K2lQL8SfH5pTJeSdj6tFB4+3FZBxi8NJW+tcx4KxYaGF3897zIPPL0FGU4sNFWOizUJVPgLYCcfMDJTMuCdIshVrPLP/vFVbBSOF7Xs55aEE9zKbIeEnZk=; X-Original-Message-ID: <637055.64224.qm@web83909.mail.sp1.yahoo.com> X-YMail-OSG: TtEROcEVM1lE84r1BpMTV19ilYryEuhYS08Xtwgc88LnlYmM0.cFnbo4Umf1Ky4B1AzQo3YvHhKm_CO5ywBaf0Kg3v0WMeu.mzhcoAz8Tm7_VT71GjpDTgED5oqWl4Wfeyuz6OlJGLW1BuS5pCZLWKIgtvhoiwLdjNwXNkQauYtCORVqKER_iYLF5y8RnhT0bt64inJCWPW9pkhmUznDN.MEvQ.p8ABUD_.2m5.l7rn8paMkRQtvNKpZJr.l9DrVzcy_zUM1QqiVJDQi83VWbd4IJDo8E3B6JVaq2zw05kLT04I_LW7Knq22ypZCoiAs0zZEgV7959Sg3vOvz35uB7r9dAIBOA7.CQ-- Received: from [98.77.129.49] by web83909.mail.sp1.yahoo.com via HTTP; Thu, 09 Apr 2009 14:10:34 PDT X-Mailer: YahooMailRC/1277.35 YahooMailWebService/0.7.289.1 References: X-Original-Date: Thu, 9 Apr 2009 14:10:34 -0700 (PDT) From: PAUL HERSHORIN Subject: Re: [LML] Re: LNC2 Aileron bellcrank bearing failure X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-381834763-1239311434=:64224" --0-381834763-1239311434=:64224 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Thanks for your reply--I took it apart today and found that the baring was = rotating within the holder--I had extra barings and replaced the old with n= ew--I bucked the rivets in and put everything back together--things are tig= ht now and I will be very careful to check for any play on all walk around = inspections--if I have someone with me I will have them hold the stick stil= l--I will move the ailerions for any play--if there is any play I will tear= into the problem again.=A0 Thanks for your support.=0APaul=0A=0A=0A=0A=0A_= _______________________________=0AFrom: "Sky2high@aol.com" =0ATo: lml@lancaironline.net=0ASent: Thursday, April 9, 2009 1:01:22 PM= =0ASubject: [LML] Re: LNC2 Aileron bellcrank bearing failure=0A=0APaul,=0A= =0AFrom your description I'm not quite sure where the failure is located.= =A0 If I remember correctly, the bell crank bearings are captured between r= iveted plates and meant to rotate in one plane only.=A0 Any deflection from= that plane is handled by the=A0rod end bearings bolted up to the bell cran= k and protected by area washers to ensure the capture of the rod ends.=A0 = =0A=0ATypically the bell rank bearing housing=A0rivets are squeezed rather= =A0than bucked - squeezed rivets can be more fragile than bucked rivets in = that they don't fill the hole as well.=A0=A0 =0A=0AWere I you, I would remo= ve and inspect the bell crank for work hardened and possibly sheared rivets= since vibration is a common cause of fastener failure.=A0 Perhaps even rep= lace the rivets in both the left and right bell cranks (assuming the bearin= gs are not damaged).=A0 The method used by Lancair is not unique to them - = If you can find a better way, do it.=A0 That is the beauty of the experimen= tal, amateur built certification category.=0A=0AScott Krueger=0A=0APS 1100 = hours and no such problems.=A0 Uh, my annual condition inspection is due th= is month and I will look at these bearing more closely.=0A=0A=0A=0AIn a mes= sage dated 4/9/2009 6:49:57 A.M. Central Daylight Time, marv@lancair.net wr= ites:=0APosted for PAUL HERSHORIN :=0A=0A=A0I = was returning on a flight the other day and the stick started to vibrate--I= =0Alooked out at the aileron and I could see the left aileron fluttering--= I =0Alanded without any problem and started my investigation into the probl= em.=A0 =0AUpon opening up the bellcrank cover and moving the aileron the be= llcrank was =0Apushing up and down when moving the aileron and holding the = =0Astick=A0stationery.=A0=A0 The bearing was twisting---my question is how = have other =0Aindividuals corrected this problem--the way it is designed is= =A0an accident =0Awaiting to happen.=0A=A0Paul Hershorin=0A=A0360--471LA=A0= =0A=0A--=0A=0AFor archives and unsub http://mail.lancaironline.net:81/lists= /lml/List.html=0A=0A________________________________=0ANew Deals on Dell Ne= tbooks - Now starting at $299 --0-381834763-1239311434=:64224 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Thanks for your reply--I took it apart today and found that the b= aring was rotating within the holder--I had extra barings and replaced the = old with new--I bucked the rivets in and put everything back together--thin= gs are tight now and I will be very careful to check for any play on all wa= lk around 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.
=0A<= DIV>Paul
=0A

=0A
=0A
=0AFrom: "Sky2high@a= ol.com" <Sky2high@aol.com>
To= : lml@lancaironline.net
= Sent: Thursday, April 9, 2009 1:01:22 PM
Subject: [LML] Re: LNC2 Aileron bellcrank beari= ng failure

=0A
Paul,
=0A
 
=0A
From your descr= iption I'm not quite sure where the failure is located.  If I remember= correctly, the bell crank bearings are captured between riveted 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 prote= cted by area washers to ensure the capture of the rod ends. 
=0A=
 
=0A
Typically the bell rank bearing housing rivet= s are squeezed rather than bucked - squeezed rivets can be more fragil= e than bucked rivets in that they don't fill the hole as well.   =
=0A
 
=0A
Were I you, I would remove and inspect th= e bell crank for work hardened and possibly sheared rivets since vibration = is a common cause of fastener failure.  Perhaps even replace the rivet= s in both the left and right bell cranks (assuming the bearings are not dam= aged).  The method used by Lancair is not unique to them - If you can = find a better way, do it.  That is the beauty of the experimental, ama= teur built certification category.
=0A
 
=0A
Scott K= rueger
=0A
 
=0A
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.
=0A
 
=0A
 =0A
 
=0A
=0A
In a message dated 4/9/2009 6:49:57 A= .M. Central Daylight Time, marv@lancair.net writes:
=0A
=0A
Posted for PAUL HERSHORIN <paulhershorin@bellsouth.ne= t>:

 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 le= ft aileron fluttering--I
landed without any problem and started my inve= stigation into the problem. 
Upon opening up the bellcrank cover a= nd moving the aileron the bellcrank was
pushing up and down when moving= the aileron and holding the
stick stationery.   The bea= ring was twisting---my question is how have other
individuals corrected= this problem--the way it is designed is an accident
waiting to ha= ppen.
 Paul Hershorin
 360--471LA 
=0A

--=0A=0AFor archives and unsub http://mail.lancaironline.net:81/lists/lml/= List.html


=0A
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