X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 17 Nov 2007 23:11:23 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2492219 for lml@lancaironline.net; Fri, 16 Nov 2007 17:04:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.4; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m23.mx.aol.com (mail_out_v38_r9.3.) id q.c75.1e5f383e (39952) for ; Fri, 16 Nov 2007 17:04:01 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 16 Nov 2007 17:04:00 EST Subject: Re: [LML] Need IV Nose Gear, HELP! X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1195250640" X-Mailer: AOL 9.0 VR sub 5006 X-Spam-Flag: NO -------------------------------1195250640 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 11/16/2007 3:16:03 P.M. Central Standard Time, cberland@systems3.net writes: One thing I found on my plane was the nose gear hydraulic cylinder assembly was to long and prevented the over-center link from going to its stop. I choose to reduce the length of the rod end fitting which before modification was bottoming out in the hydraulic cylinder. This condition was never given a chance to be a problem, but... Craig, The extension of hydraulic actuators should be adjusted so that the piston is stopped against the inside of the end plate. This is important. While the over center link may be able to withstand 800 psi, the gear pivots and connections may not when the landing forces are added on top of that. A hard or stressed landing, overfilled tires, higher than normal pressure in the strut and certain super angular forces against linkage from high hydraulic pressure, some possibly caused by descent to warmer temperatures, can add up to gear failures. With a little encouragement one should be able to remove over center linkage pivot bolts with the actuator fully extended (whilst the craft is on jacks). I.E. Actuator extension should keep over center links snug, but not under high forces because of hydraulic pressure. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Darwinian culling phrase: Watch This! ************************************** See what's new at http://www.aol.com -------------------------------1195250640 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 11/16/2007 3:16:03 P.M. Central Standard Time,=20 cberland@systems3.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0000ff size= =3D2>
One thing I found on my plane was the nose gear= =20 hydraulic cylinder assembly was to long and prevented the over-center link= =20 from going to its stop.  I choose to reduce the length of the rod=20 end fitting which before modification was bottoming out in the hydrau= lic=20 cylinder.  This condition was never given a chance to be a problem,=20 but...
Craig,
 
The extension of hydraulic actuators should be adjusted so that the pis= ton=20 is stopped against the inside of the end plate.  This is important.&nbs= p;=20 While the over center link may be able to withstand 800 psi, the gear pivots= and=20 connections may not when the landing forces are added on top of that. =20= A=20 hard or stressed landing, overfilled tires, higher than normal pressure in t= he=20 strut and certain super angular forces against linkage from high hydrau= lic=20 pressure, some possibly caused by descent to warmer temperatures, can add up= to=20 gear failures. 
 
With a little encouragement one should be able to remove over center=20 linkage pivot bolts with the actuator fully extended (whilst the craft is on= =20 jacks).  I.E. Actuator extension should keep over center links snu= g,=20 but not under high forces because of hydraulic pressure.=20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Darwinian culling phrase: Watch=20 This!



See wha= t's new at AOL.co= m and Make AOL Your Homepage.
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