X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 01 Mar 2007 14:13:45 -0500 Message-ID: X-Original-Return-Path: Received: from smtp4.na.baesystems.com ([63.164.202.13] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1876783 for lml@lancaironline.net; Thu, 01 Mar 2007 13:57:46 -0500 Received-SPF: none receiver=logan.com; client-ip=63.164.202.13; envelope-from=Christopher.Zavatson@baesystems.com Received: from smtp2.na.baesystems.com (smtp2.na.baesystems.com [10.40.96.13]) by smtp4.na.baesystems.com (8.13.6/8.13.6) with ESMTP id l21IuPAV004157 for ; Thu, 1 Mar 2007 13:56:28 -0500 (EST) Received: from GLDMS00005.goldlnk.rootlnka.net ([10.44.64.11]) by smtp2.na.baesystems.com (8.13.6/8.13.6) with ESMTP id l21ItvIc027212 for ; Thu, 1 Mar 2007 13:56:25 -0500 (EST) Received: from gldms10602.goldlnk.rootlnka.net ([10.64.39.19]) by GLDMS00005.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Thu, 1 Mar 2007 13:56:05 -0500 Received: from GLDMS10607.goldlnk.rootlnka.net ([10.64.39.20]) by gldms10602.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Thu, 1 Mar 2007 10:56:04 -0800 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C75C33.42CD28A3" Subject: MKII elevator hinges X-Original-Date: Thu, 1 Mar 2007 10:56:03 -0800 X-Original-Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: MKII elevator hinges Thread-Index: AcdcM0+RtKOTkU61Qqy8iIbj4i9lAg== From: "Zavatson, Christopher J \(US SSA\)" X-Original-To: "Lancair list" X-OriginalArrivalTime: 01 Mar 2007 18:56:04.0257 (UTC) FILETIME=[431F7110:01C75C33] This is a multi-part message in MIME format. ------_=_NextPart_001_01C75C33.42CD28A3 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The recent discussion of elevator hinge play reminded me of a related issue on the MKII elevator. The root cause of the wear issues in hinges for this particular location are the loads induced by the torsional input from the engine. The spherical bearings in the MKII tail are not immune from this abuse. The original bearings are of the low end COM series. After some 7 years I noticed that slight vertical movement outboard on the elevator was now possible. The clunk-clunk sound of metal on metal was quite distinct. I ended up replacing these bearing with Aurora Precision Series bearings (LHA 4). The static load rating is more than double the COM series. Not that we ever expect to be pulling on the bearing with 10,000 lb, for us this translates into greater resistance to the development of play due to the higher strength materials used. Shortly after this switch-out Lancair began offering replacement bearings with a PTFE liner. I also switched out the rod end bearings in the main gear over center link in about '98 @ 200 hours for similar reasons. The original bearings had a bronze race, the replacement is alloy steel - again with twice the load rating (Aurora AM series). =20 Chris Zavatson N91CZ 360std www.N91CZ.com =20 ------_=_NextPart_001_01C75C33.42CD28A3 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
The = recent=20 discussion of elevator hinge play reminded me of a related issue on the = MKII=20 elevator.  The root cause of the wear issues in hinges for this = particular=20 location are the loads induced by the torsional input from the=20 engine.  The spherical bearings in the MKII tail are not immune = from this=20 abuse.  The original bearings are of the low end COM series.  = After=20 some 7 years I noticed that slight vertical movement = outboard on the=20 elevator was now possible.  The clunk-clunk sound of metal on=20 metal was quite distinct.  I ended up replacing these = bearing=20 with Aurora Precision Series bearings (LHA 4).  The static = load rating=20 is more than double the COM series.  Not that we ever = expect to=20 be pulling on the bearing with 10,000 lb, for us this translates = into=20 greater resistance to the development of play due to the higher strength = materials used.  Shortly after this switch-out Lancair began = offering=20 replacement bearings with a PTFE liner.
I also = switched out=20 the rod end bearings in the main gear over center link in about = '98 @ 200=20 hours for similar reasons.  The original bearings had a = bronze=20 race, the replacement is alloy steel - again with twice the load = rating=20 (Aurora AM series).
 
Chris = Zavatson
N91CZ
360std
www.N91CZ.com
  &= nbsp; =20
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