X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 14 Feb 2006 13:19:17 -0500 Message-ID: X-Original-Return-Path: Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 984372 for lml@lancaironline.net; Tue, 14 Feb 2006 09:34:14 -0500 Received-SPF: none receiver=logan.com; client-ip=207.109.1.8; envelope-from=Christopher.Zavatson@baesystems.com Received: from mnexch01.MSGDOMAIN.MPLS.UDLP.COM ([10.1.62.20]) by mta-out-1.udlp.com (8.12.10/8.12.10) with ESMTP id k1EEAZqu022473 for ; Tue, 14 Feb 2006 08:10:35 -0600 Received: from asdmngwia.udlp.com ([10.1.62.22] RDNS failed) by mnexch01.MSGDOMAIN.MPLS.UDLP.COM with Microsoft SMTPSVC(6.0.3790.211); Tue, 14 Feb 2006 08:28:38 -0600 Received: from DM-MN-06-MTA by asdmngwia.udlp.com with Novell_GroupWise; Tue, 14 Feb 2006 08:32:49 -0600 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.5.4 X-Original-Date: Tue, 14 Feb 2006 08:32:34 -0600 From: "Christopher Zavatson" X-Original-To: Subject: Re: [LML] Easy check of nose gear gas spring Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=__Part22009D12.0__=" X-OriginalArrivalTime: 14 Feb 2006 14:28:38.0212 (UTC) FILETIME=[F1F64840:01C63172] This is a MIME message. If you are reading this text, you may want to consider changing to a mail reader or gateway that understands how to properly handle MIME multipart messages. --=__Part22009D12.0__= Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable <> =20 This is a much better approach to testing the gas spring than using the = nominal 100 lb check. I started using this method about 7 years ago. It = is much easier to perform and gives a much better picture of the health of = the system. I can still lock the gear at 102 KIAS on a seven year old = strut using the technique Bob describes. One important variable in this = installation is how much friction is present in all the nose gear linkages = and pivots. My CFI was testing another Lancair when something went wrong = with the hydraulic pump. He could not get a green on the nose despite all = the aerobatics he tried. The gear didn't collapse but hadn't quite made = it over center either. He stopped on the runway and pulled the link over = center by hand. Inspection revealed that the linkages were binding during = travel. In this case even the nominal 100 lb strut was not sufficient. Chris Zavatson N91CZ 360 std. www.N91CZ.com --=__Part22009D12.0__= Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Description: HTML
<<Instead of slowing to 80 kt = before opening the dump valve,  pull the pump breaker(s) and slow to = 120 kt.   Open the dump valve and gradually let the speed = bleed off.  Note when the nose gear down light comes on.   = As the spring gets weaker you will have to go slower before the light = comes on.   >>
 
This is a much better approach to testing the gas spring than using = the nominal 100 lb check.  I started using this method about 7 years = ago.  It is much easier to perform and gives a much better picture of = the health of the system.  I can still lock the gear at 102 KIAS = on a seven year old strut using the technique Bob describes.  One = important variable in this installation is how much friction is present in = all the nose gear linkages and pivots.  My CFI was testing another = Lancair when something went wrong with the hydraulic pump.  He could = not get a green on the nose despite all the aerobatics he tried.  The = gear didn't collapse but hadn't quite made it over center either.  He = stopped on the runway and pulled the link over center by hand.  = Inspection revealed that the linkages were binding during travel.  In = this case even the nominal 100 lb strut was not sufficient.

Chris = Zavatson
N91CZ
360 std.
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