X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 28 Jan 2013 14:48:10 -0500 Message-ID: X-Original-Return-Path: Received: from nm13-vm1.bullet.mail.ne1.yahoo.com ([98.138.91.62] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTPS id 6033481 for lml@lancaironline.net; Mon, 28 Jan 2013 14:04:20 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.91.62; envelope-from=mcmess1919@yahoo.com Received: from [98.138.90.55] by nm13.bullet.mail.ne1.yahoo.com with NNFMP; 28 Jan 2013 19:03:44 -0000 Received: from [98.138.84.43] by tm8.bullet.mail.ne1.yahoo.com with NNFMP; 28 Jan 2013 19:03:44 -0000 Received: from [127.0.0.1] by smtp111.mail.ne1.yahoo.com with NNFMP; 28 Jan 2013 19:03:44 -0000 X-Yahoo-Newman-Id: 487202.52887.bm@smtp111.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: eZGjNmUVM1mIgtohAo6wcKuJze0oajnUm7AfWaZH9H.N6oY CFJ6Ti6hjuDyrh7y5VZGw7Mn2eeZJ8lV8V3bbArd_.Mfvp72SMn7FEnxcfnU 9Jue5_gW3WSfC4tCbl5Cl6QQQZe4kPW3gPgnDg1wVghioY8u51w3kvI9oPUX GnvlF.NDC3db._Odw86K8L8ZfrfBBEJrzNgOc8Yu2WpUApcqdbW_x_7OTV5C zktJDeoPHTaE6WhV0HhJOnP6fZ5sibMFSl1sRpCOTzJPdCDmvjomohY3yCQb VkA2.Ox4V5fT_yZlpZM6uAF2gwUfU3IiD_pTe8v0pxQQPRnw9L85YA0.KoGb qeGKRDxAHfUBnZSM5Ery5HhI1R.1FRvW1hnsTd5pmHgJzBEvUAEqAyKocXZA .qhnoM8CiBGdn_8M4LdkpQ0K4Odztv._jP1gcCSQ0eYKTHn0F8SGFEg.CIPk 87_Nq9Vrp_.wzz2Fe.ck1I1aTUL6wVl_6lwdsUB0ncicpmY4VyOvsr1FOsY9 .hMlITVg- X-Yahoo-SMTP: rK4i7HqswBC7mDE8.sOiWQeO4CeReXc- Received: from StevePC (mcmess1919@24.28.81.128 with login) by smtp111.mail.ne1.yahoo.com with SMTP; 28 Jan 2013 11:03:43 -0800 PST From: "Steve Colwell" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: Thermal influence on Hydraulic Pressure X-Original-Date: Mon, 28 Jan 2013 13:03:44 -0600 X-Original-Message-ID: <016501cdfd8a$3236f8b0$96a4ea10$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0166_01CDFD57.E79C88B0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Ac39eRPh0sfn/OlGSziohr9htVDK8wADyeNQ Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_0166_01CDFD57.E79C88B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Wolfgang, Two questions. Have you tested your Module under Thermal Lock with all the configurations of hydraulic systems and pump variations supplied for Lancairs over the years? Which Lancair are you flying or building? Steve Colwell Legacy From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Wolfgang Sent: Monday, January 28, 2013 11:01 AM To: lml@lancaironline.net Subject: [LML] Re: Thermal influence on Hydraulic Pressure Understood . . . but a module like mine doesn't care what version your pump is, it just works. Wolfgang ----- Original Message ----- From: Chris Zavatson To: lml@lancaironline.net Sent: Sunday, January 27, 2013 6:59 AM Subject: Re: [LML] Re: Thermal influence on Hydraulic Pressure Charley, Lancair started adding return springs inside the spool valve for Legacy pumps in about 2005. One of the consequences of doing this is what you have observed in the hangar. You sort of have a 'get out of jail free' card in that your hydraulic system has a three-way valve. It doesn't prevent the lock-up. It just gives you a way out. Folks installing the 'Legacy' pump in 300 series plane with a two-way valve can get stuck. Fortunately the springs are easily removed and Parker has been providing the parts free-of-charge to reset pumps back to the pre-2005 configuration. Chris Chris Zavatson N91CZ 360std. 1,400 hrs http://www.n91cz.net/ From: Charles Brown To: lml@lancaironline.net Sent: Friday, January 25, 2013 11:07 PM Subject: [LML] Re: Thermal influence on Hydraulic Pressure This has happened to me even at the beginning of a flight, if the temps in the hangar have gone from cold on a previous day, to warm on flight day. I guess cold temps shrink the fluid and suck more from the reservoir into the lines, and when it warms, the pressure builds on both sides of the system, so that the "up" and "down" pressure switches are both open and the gear won't move until I pop the bleed valve. Nasty when the gear won't retract just after blasting off into a low overcast. Charley Brown Legacy #299 200 hr On Jan 25, 2013, at 7:23 AM, randy snarr wrote: . I dont like having to open the dump valve but it is necessary once in a while especially when it is cold. The pressures on both sides of the system climb due to the engine heat and the gear sometimes will not move without dumping the pressure. ------=_NextPart_000_0166_01CDFD57.E79C88B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Wolfgang,

 

Two questions.  Have you tested your Module under Thermal Lock = with all the configurations of hydraulic systems and pump variations = supplied for Lancairs over the years?  Which Lancair are you flying = or building?

 

Steve Colwell  Legacy 

 

From:= = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Wolfgang
Sent: Monday, January 28, 2013 11:01 = AM
To: lml@lancaironline.net
Subject: [LML] Re: = Thermal influence on Hydraulic = Pressure

 

Understood . = . . but a module like mine doesn't care what version your pump is, it = just works.

 

Wolfgang

 

----- = Original Message -----

From:<= /b> Chris Zavatson =

Sent:<= /b> = Sunday, January 27, 2013 6:59 AM

Subject: = Re: [LML] Re: Thermal influence on Hydraulic = Pressure

 

Charley,

Lancair started = adding return springs inside the spool valve for Legacy pumps in about = 2005.  One of the consequences of doing this is what you have = observed in the hangar.  You sort of have a 'get out of jail free' = card in that your hydraulic system has a three-way valve.  It = doesn't prevent the lock-up.  It just gives you a way out.  = Folks installing the 'Legacy' pump in 300 series plane with a two-way = valve can get stuck.  Fortunately the springs are easily removed = and Parker has been providing the parts free-of-charge to reset pumps = back to the pre-2005 = configuration.

Chris

 <= /span>

Chris = Zavatson

N91CZ

360std. 1,400 = hrs

 <= /span>

F= rom: = Charles Brown <browncc1@verizon.net>
T= o: lml@lancaironline.net =
Sent: Friday, January 25, 2013 11:07 PM
Subject: = [LML] Re: Thermal influence on Hydraulic Pressure

 

This has happened = to me even at the beginning of a flight, if the temps in the hangar have = gone from cold on a previous day, to warm on flight day.  I guess = cold temps shrink the fluid and suck more from the reservoir into the = lines, and when it warms, the pressure builds on both sides of the = system, so that the "up" and "down" pressure = switches are both open and the gear won't move until I pop the bleed = valve.

 

Nasty when the gear won't retract just after = blasting off into a low overcast.

 

Charley Brown

Legacy #299  200 = hr

 

On Jan 25, 2013, at 7:23 AM, randy snarr = wrote:

 

<= div>

. I = dont like having to open the dump valve but it = is necessary once in a while especially when it is cold. The pressures = on both sides of the system climb due to the engine heat and the gear = sometimes will not move without dumping the = pressure.

 

 

  =

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