Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5b3) with ESMTP id 870412 for rob@logan.com; Tue, 25 Sep 2001 13:20:12 -0400 Received: from prserv.net ([32.97.166.31]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Mon, 24 Sep 2001 22:10:16 -0400 Received: from oemcomputer (slip-12-64-192-63.mis.prserv.net[12.64.192.63]) by prserv.net (out1) with SMTP id <2001092502214020105mcc8te>; Tue, 25 Sep 2001 02:21:40 +0000 Message-ID: <003b01c1456a$026f8f00$0dd8400c@oemcomputer> From: "Larry Henney" To: References: <66A548E9A894D51187FB0008C7CF284C6AE5D2@clt-exch-05.capmark.funb.com> Subject: Re: LNC2 gear retract Date: Mon, 24 Sep 2001 21:09:05 -0500 Organization: American Airlines MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Matt, I've had two occasions where my gear didn't come up. Two system problems may be involved. The pressure switch and / or a failed intermittant duty relay. The first time I was on the road and sparked across the up hydraulic pressure switch with a screwdriver (airborne as I had no jacks) thus bypassing the switch. This churped the pump and subsequently all worked fine. Although I've not since replaced the switch these switches have been known to occasionally fail. The second time (I had jacks) the intermittant duty relay had failed (fried). This was due to extended duration flight with the CB pulled. In my plane the 50 amp CB does not isolate the relay control power; just the high current hyd. pump power. Therefore the relay was actuated (unfortunately) the whole time I had the CB pulled. A secondary issue was an internal hydraulic fluid leak causing the pump to cycle intermittantly (thus prompting me to pull the breaker). It turns out the dump valve (designed at 600psig) is undersized (hello- this should've been self evident) and had an internal leak. I replaced the both valve (with a 2500 psig valve (i think)) and the relay and now all is well. Total cost - about $30. Good Luck, Larry Henney >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>