X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 17 Apr 2007 21:08:36 -0400 Message-ID: X-Original-Return-Path: Received: from rwcrmhc12.comcast.net ([204.127.192.82] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1990511 for lml@lancaironline.net; Tue, 17 Apr 2007 19:55:46 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.192.82; envelope-from=rbelshe@comcast.net Received: from desk (c-67-174-246-172.hsd1.ca.comcast.net[67.174.246.172]) by comcast.net (rwcrmhc12) with SMTP id <20070417235501m1200cjonue>; Tue, 17 Apr 2007 23:55:01 +0000 From: "Bob B." X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: Gear Trouble X-Original-Date: Tue, 17 Apr 2007 16:54:40 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008D_01C78111.171B9820" X-Mailer: Microsoft Office Outlook, Build 11.0.6353 In-Reply-To: Thread-Index: AceBPT9mc3IcusT5R16yD6con1VA3gADZjUg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Original-Message-ID: This is a multi-part message in MIME format. ------=_NextPart_000_008D_01C78111.171B9820 Content-Type: text/plain; charset="windows-1250" Content-Transfer-Encoding: 7bit I don't understand this analysis. If the system pressure is high enough to hold both pressure switches open, how would opening the dump valve release the excess pressure? Chris Z, your opinion? Bob Belshe Moraga, CA Lancair 235/320 HYPERLINK "http://home.comcast.net/~rbelshe/"http://home.comcast.net/~rbelshe/ _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Randy Sent: Tuesday, April 17, 2007 3:11 PM To: lml@lancaironline.net Subject: [LML] Re: Gear Trouble I don't know if the problem is from a spool valve, this is the second pump I've had in my plane and both have done the same thing in warmer weather. And, of course, being in southern California it's usually always on the warm side. I can see on the gear pressure gauge that as the heat goes up so does the pressure. It's gets to a point where the pressure opens both pressure switches, so when I switch to gear down there's no connection. One small tap on the dump valve and it releases the excess pressure on the low side and the pump lites up. I've seen this same problem with other Lancairs I fly with but never a solution. There should be a small expansion tank or relief valve going back to the reservoir on the low side of the pump. Last resort would be a relay to over ride the low pressure switch, fed through the high pressure circuit for a momentary pump start. This would have the same effect as tapping the dump valve for a second. I'm not sure what the answer is. Randy Stuart LNC2 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.1/764 - Release Date: 4/17/2007 4:43 AM ------=_NextPart_000_008D_01C78111.171B9820 Content-Type: text/html; charset="windows-1250" Content-Transfer-Encoding: quoted-printable

I=20 don't understand this analysis. If the system pressure is = high=20 enough to hold both pressure switches open, how would opening the dump = valve=20 release the excess pressure?

Chris Z, your opinion?

Bob Belshe
Moraga, = CA
Lancair=20 235/320
http://home.comcast.net/~rbelshe/ =

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of = Randy
Sent:=20 Tuesday, April 17, 2007 3:11 PM
To:=20 lml@lancaironline.net
Subject: [LML] Re: Gear=20 Trouble

I don't know if the problem is = from a=20 spool valve, this is the second pump I've had in my plane and both = have done=20 the same thing in warmer weather. And, of course, being in southern = California=20 it's usually always on the warm side.

I can see on the gear pressure = gauge=20 that as the heat goes up so does the pressure. It's gets to a point = where the=20 pressure opens both pressure switches, so when I switch to gear down = there's=20 no connection. One small tap on the dump valve and it releases the = excess=20 pressure on the low side and the pump lites up.

I've seen this same problem = with other=20 Lancairs I fly with but never a solution. There should be a=20 small expansion tank or relief valve going back to the reservoir = on the=20 low side of the pump. Last resort would be a relay to over ride the = low=20 pressure switch, fed through the high pressure circuit for a = momentary=20 pump start. This would have the same effect as tapping the dump valve = for a=20 second. I'm not sure what the answer is.

Randy Stuart

LNC2

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 269.5.1/764 - Release Date: 4/17/2007 = 4:43 AM

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