X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 19 Oct 2009 13:37:35 -0400 Message-ID: X-Original-Return-Path: Received: from blu0-omc3-s36.blu0.hotmail.com ([65.55.116.111] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3891080 for lml@lancaironline.net; Mon, 19 Oct 2009 13:00:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.55.116.111; envelope-from=randystuart@hotmail.com Received: from BLU0-SMTP15 ([65.55.116.74]) by blu0-omc3-s36.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Mon, 19 Oct 2009 10:00:26 -0700 X-Originating-IP: [99.166.34.92] X-Originating-Email: [randystuart@hotmail.com] X-Original-Message-ID: X-Original-Return-Path: randystuart@hotmail.com Received: from laptop ([99.166.34.92]) by BLU0-SMTP15.blu0.hotmail.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Mon, 19 Oct 2009 10:00:24 -0700 From: "Randy" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] LNC2 Hydraulic Gear Operation Fix X-Original-Date: Mon, 19 Oct 2009 10:00:24 -0700 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-OriginalArrivalTime: 19 Oct 2009 17:00:24.0922 (UTC) FILETIME=[A6C233A0:01CA50DD] This looks like a relay that when it senses the Hi pressure switch being open, while the gear is up, shorts and closes the Lo pressure circuit. This will bypass the Lo pressure sensor when the sensor opens from the hydraulic fluid expanding. This type of fix does not stop the hydraulic fluid from expanding more and more as it heats up. The hydraulic fluid expansion can damage the hydraulic system. I have monitored this problem and have seen the Lo side exceed 2000 psi during this heat expansion in the summer months. If this relay sticks the Lo sensor circuit will be on all the time regardless of the pressure sensor. The ONLY way to approach this work around for the Oildyne pump problem is to REMOVE the pressure from the Lo side. Relieving the expanding hydraulic fluid and put it back in the reservoir where it belongs!!!! This type of "Fix" that simply bypasses the open Lo sensor and does not relieve the expanding hydraulic fluid is insane and it's a ticking time bomb for gear failure!!! Randy Stuart LNC-2 ----- Original Message ----- From: "Lorn H Olsen" To: Sent: Monday, October 19, 2009 6:18 AM Subject: [LML] LNC2 Hydraulic Gear Operation Fix >A module to fix the gear operation failure problem in the LNC2 using > the standard hydraulic system is now available. > > The problem occurs when thermal expansion has caused both HI and LO > pressure switches to trip rendering the landing gear hydraulic pump > incapable of operating. > > This module will activate the hydraulic pump motor in the direction > selected by the gear switch when both pressure switches have been > tripped by high pressure thereby relieving the pressure in the > offending side. > > The module is 2.5" x 1.5" x .75", weighs 2.3 oz. and has two pairs of > leads that connect directly to each pressure switch with 1/4" spade > terminals. No other wiring is necessary. Price is $250.00 each. Simple > installation instructions included. > > Contact Wolfgang at 248-471-2000 or Wolfgang@MiCom.net > > -------------------------------------------------------------------------------- > > > -------------------------------------------------------------------------------- > > -- > Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst > DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us > LNC2, FB90/92, O-320-D1F, 1,650 hrs, N31161, Y47, SE Michigan > > -------------------------------------------------------------------------------- > -- > For archives and unsub > http://mail.lancaironline.net:81/lists/lml/List.html >