X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 28 Jan 2013 12:01:05 -0500 Message-ID: X-Original-Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6033057 for lml@lancaironline.net; Mon, 28 Jan 2013 10:56:13 -0500 Received-SPF: none receiver=logan.com; client-ip=71.74.56.122; envelope-from=Wolfgang@MiCom.net X-Original-Return-Path: X-Authority-Analysis: v=2.0 cv=QcjkT7nv c=1 sm=0 a=MHZY6FYWMEQOp7S43i2QIw==:17 a=3Zlka_XeuxsA:10 a=f_ZkDAzIiSUA:10 a=ttCsPuSJ-FAA:10 a=rTjvlri0AAAA:8 a=f5qw7zG_ri8A:10 a=Ia-xEzejAAAA:8 a=5FIZSGrRAAAA:8 a=o1OHuDzbAAAA:8 a=TxkMjtX4dnRFXEgXdyMA:9 a=wPNLvfGTeEIA:10 a=EzXvWhQp4_cA:10 a=ILCZio5HsAgA:10 a=KqRZGBk3_ZOT_w-H:21 a=tuk_kN5NZX7Y3ltp:21 a=CjxXgO3LAAAA:8 a=GE5YLNkA_TJQ6ZhpazEA:9 a=_W_S_7VecoQA:10 a=rC2wZJ5BpNYA:10 a=SuWdCayZ0jXmCMmZ:21 a=MHZY6FYWMEQOp7S43i2QIw==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.218.201.50 Received: from [74.218.201.50] ([74.218.201.50:1242] helo=lobo) by hrndva-oedge03.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 34/D0-06396-A7F96015; Mon, 28 Jan 2013 15:55:39 +0000 X-Original-Message-ID: <83959140C7EC44AAA1C0B270C13F24F4@lobo> From: "Wolfgang" X-Original-To: References: Subject: Re: [LML] Re: Thermal influence on Hydraulic Pressure X-Original-Date: Mon, 28 Jan 2013 10:55:36 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D0_01CDFD46.006ACDF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 This is a multi-part message in MIME format. ------=_NextPart_000_00D0_01CDFD46.006ACDF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Understood . . . but a module like mine doesn't care what version your = pump is, it just works. Wolfgang ----- Original Message -----=20 From: Chris Zavatson=20 To: lml@lancaironline.net=20 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=20 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_00D0_01CDFD46.006ACDF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Understood . . . but a module like mine = doesn't=20 care what version your pump is, it just works.
 
Wolfgang
 
----- Original Message -----
From:=20 Chris=20 Zavatson
Sent: Sunday, January 27, 2013 = 6:59=20 AM
Subject: Re: [LML] Re: Thermal = influence=20 on Hydraulic Pressure

Charley,
Lancair started adding return springs inside the spool = valve for=20 Legacy pumps in about 2005.  One of the consequences of doing this is what you have = observed in the=20 hangar.  You sort of have a 'get out of jail free' card in that = your=20 hydraulic system has a three-way valve.  It doesn't prevent the=20 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. =20 Fortunately the springs are easily removed and Parker has been = providing the=20 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=20 <browncc1@verizon.net>
To: lml@lancaironline.net =
Sent: Friday, January 25, 2013 = 11:07=20 PM
Subject: [LML] = Re: Thermal=20 influence on Hydraulic Pressure

This has happened to me even at the beginning of a flight, if the = temps=20 in the hangar have gone from cold on a previous day, to warm on flight = day.=20  I guess cold temps shrink the fluid and suck more from the = reservoir=20 into the lines, and when it warms, the pressure builds on both sides = of the=20 system, so that the "up" and "down" pressure switches are both open = and the=20 gear won't move until I pop the bleed valve.

Nasty when the gear won't retract just after blasting off into a = low=20 overcast.

Charley Brown
Legacy #299  200 hr

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

.=20 I dont like having to open = the dump=20 valve but it is necessary once in a while especially when it is cold. = The=20 pressures on both sides of the system climb due to the engine heat and = the=20 gear sometimes will not move without dumping the pressure.

<= BR>
 =20 ------=_NextPart_000_00D0_01CDFD46.006ACDF0--