X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [69.171.58.236] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WEBUSER 5.1c.2) with HTTP id 1223440 for lml@lancaironline.net; Tue, 04 Jul 2006 11:53:17 -0400 From: "Marvin Kaye" Subject: Re: LNC2 Hydraulic problem To: lml X-Mailer: CommuniGate Pro WebUser v5.1c.2 Date: Tue, 04 Jul 2006 11:53:17 -0400 Message-ID: In-Reply-To: References: X-Priority: 3 MIME-Version: 1.0 Content-Type: text/plain;charset="iso-8859-1";format="flowed" Content-Transfer-Encoding: 8bit Posted for "Gerard O Connell" : Matt, That is weird, there have been many complaints about the opposite problem, failure of the pump to activate after a long flight and gear is selected down. The concensus for this seems to be a leak from high to low across the dump valve and is fixed by slightly loosening the dump valve in flight. The pump usually begins running (if gear handle is left down and circuit breaker NOT pulled as per check list). Have you tried opening the dump valve when this has happened? I have observed marked pressure changes on my hydraulic guage with variance in outside air temperature (up to 1800-1900 psi). Perhaps the solution is to leave the dump valve open whilst the airplane is parked in hot conditions...??? I believe there is reference to this practice on prior LML posts to avoid over stressing the hydraulics whilst parked. Tricky problem... -- Gerard O Connell Melbourne, Australia VH-LPD (LNC2)