Return-Path: Sender: (Marvin Kaye) To: lml Date: Tue, 21 Jan 2003 14:07:55 -0500 Message-ID: X-Original-Return-Path: Received: from mailrelay.udlp.com ([207.109.1.10] verified) by logan.com (CommuniGate Pro SMTP 4.0.5) with ESMTP id 1994127 for lml@lancaironline.net; Tue, 21 Jan 2003 14:05:24 -0500 Received: from asdmngwia.mpls.udlp.com (asdmngwia.mpls.udlp.com [10.1.62.22]) by mailrelay.udlp.com (8.12.6/8.12.6) with ESMTP id h0LJ5KDG004703 for ; Tue, 21 Jan 2003 13:05:21 -0600 Received: from DM-MN-06-MTA by asdmngwia.mpls.udlp.com with Novell_GroupWise; Tue, 21 Jan 2003 13:05:15 -0600 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.0.1 X-Original-Date: Tue, 21 Jan 2003 13:04:49 -0600 From: "Christopher Zavatson" X-Original-To: Subject: Re: [LML] LNC2: Inner Gear Door Rod End Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Spam-Status: No, hits=0.8 required=7.0 tests=SPAM_PHRASE_00_01 version=2.42 Rick, I had the same failure several years ago. Looking at the fracture surface using a Scanning Electron Microscope revealed very poor quality metal with lots of inclusions. There was some sign of low cycle fatigue a the first thread root, but the primary mode of failure was fracture. The identical replacement has not failed(yet). On the bright side, the failure showed that the inner gear door can handle 200kts while hanging freely. At a later annual I replaced the rod end bearing for the main gear with higher strength units. Same dimensions but more than twice the strength. All of the original units supplied are a low carbon steel. The Aurora AM series uses a heat treated steel alloy and is a drop in replacement at about twice the cost. Chris Zavatson N91CZ 360std >>> RICARGENTE@cs.com 01/21/03 10:08AM >>> During the preflight inspection, I discovered that the pilot-side inner gear door was dangling freely. The rod end bearing from the inner gear door hydraulic cylinder was sheared off completely. I have never heard of this failure before and was wondering if anybody on the list have had the same failure. Any ideas how this could have occurred? Kinda unusual failure, uh? Rick Argente LNC2 N360ZR ############################################################# For archives see the LML website: http://www.lancaironline.net/maillist.html LML members receive a 10% discount at http://www.buildersbooks.com