X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 21 Apr 2014 11:43:52 -0400 Message-ID: X-Original-Return-Path: Received: from [63.230.26.161] (HELO exchange.arilabs.net) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6831884 for lml@lancaironline.net; Thu, 17 Apr 2014 12:08:20 -0400 Received-SPF: none receiver=logan.com; client-ip=63.230.26.161; envelope-from=kevin@arilabs.net Received: from exchange.arilabs.net ([10.100.100.1]) by exchange.arilabs.net ([10.100.100.1]) with mapi; Thu, 17 Apr 2014 10:07:43 -0600 From: Kevin Stallard X-Original-To: Lancair Mailing List X-Original-Date: Thu, 17 Apr 2014 10:04:18 -0600 Subject: RE: [LML] Gear Down...INOP Thread-Topic: [LML] Gear Down...INOP Thread-Index: Ac9ZfRuvkPfywk23RCaoxkqhonWEMAA2ZR8D X-Original-Message-ID: <779FE3D761D7B741813E300858A248CF010CC3AAA6C1@exchange.arilabs.net> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Do you have hydraulic pressure gauges installed so you can see the pressure= on the high and low side? I suspect that quickly opening and closing the dump valve would cure your p= roblems, because yes, there is an interaction that occurs between the high = and low side and the poppet valve in your pump. But unless you know the p= ressure on the high and low side when the problem occurs, I can't say for s= ure. I've seen this once on my plane. Hitting the dump valve quickly solved the= problem. Kevin ________________________________________ From: Lancair Mailing List [lml@lancaironline.net] On Behalf Of William For= d [willydford@gmail.com] Sent: Wednesday, April 16, 2014 8:06 AM To: lml@lancaironline.net Subject: [LML] Gear Down...INOP I believe that I recently experienced something in my Legacy that I remembe= r reading about but can't remember all the details. I looked into the LML = archives and was unsuccessful. Could someone out there please briefly summ= arize the situation, reason and any possible remedies for gear extension fa= ilure following high altitude cruise in cold air followed by a decent and l= anding in hot air. I seem to remember a discussion about boosted pressure = in the hydraulics plumbing due to the rapid rise in temperature which in tu= rn had an effect on the operation of the pressure switch In my recent expe= rience...after opening the dump valve, the hydraulic pump did run, confirmi= ng continuity to the pump. After working the nose gear into the locked pos= ition, the landing was uneventful but I would like to avoid this uncomforta= ble situation in the future. Would a tweak on the pressure switch adjustme= nt be called for here or just expect to momentarily crack open the dump val= ve to relieve excess pressure. Thanks for your thoughts. William Ford N11LL=