X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 27 Jan 2013 06:59:24 -0500 Message-ID: X-Original-Return-Path: Received: from nm26.bullet.mail.ne1.yahoo.com ([98.138.90.89] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTPS id 6030913 for lml@lancaironline.net; Sat, 26 Jan 2013 14:26:18 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.90.89; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.55] by nm26.bullet.mail.ne1.yahoo.com with NNFMP; 26 Jan 2013 19:25:43 -0000 Received: from [98.138.88.234] by tm8.bullet.mail.ne1.yahoo.com with NNFMP; 26 Jan 2013 19:25:43 -0000 Received: from [127.0.0.1] by omp1034.mail.ne1.yahoo.com with NNFMP; 26 Jan 2013 19:25:43 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 242248.10528.bm@omp1034.mail.ne1.yahoo.com Received: (qmail 21725 invoked by uid 60001); 26 Jan 2013 19:25:43 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=d7oO9nUOBz8CiJAQvqx7cJrV1/lwnZpav2KEI3b47rimIrqp09yLepGabYR3EeG8pH+KTjJ/zyzcUPT0Xdd7/zygR38pnusmwGCWL70okjqIa1fgRiwBTYxsPpAkWTagEb7WpAPhFDzUvzQ7DfIMeIgSFjvL7usb3HWj1uEKICQ=; X-YMail-OSG: QRVbtw8VM1kdivNpnaJ7zEfKDHXt_WGA_jh9ey5xjbRIe7s wEpJ0vdjSqwSUxduHQduhai6dfyTXg4wCc4VUKo0ovpgM2Odc3frgcWRSjHy 0QMhYiTjbbaoO5nqxkcTadfjz03FMkyOoZcNig4YMuLuIiO3JqVWTEzz26_k 1BJrq90rev8gSO9yiRN_DC6UtKd1LR1BhbR7P9up6FibX.tX.uJ9VuCCN9Aw vfGn3y1i45XvOQKUTY1QUsNUn1pnuOrdykNwrpp7dGMDkH58ZzRjZBYNl7Y0 M.GyQrzYdfWB_IZHjd2.MImOLJoB93jY3u.fPDjPU4VXFDBX9tPDXHD53ovA 0t2ZmjCAgdOLyrX7NoRv0EmW7FSluLtap14PskEXMYiea7nBtDBNpx8SnIjE 3hHzaZCiZ3dPEZAuTm9IxMI5WwERrgggB1v7mKIs4ydkc2HOPbuQBKhdZ2cQ lJ0VMXwoF1JSPxnBEAL4VwUp1SFWgy7a8DO0Ce5lYMpQY_V1MX4B4Zzd7ZOE C_mbbM2LG2x8S_IadZpmQSVlLCO.L6i7M0nIEGrSoIYZJ0fEbJqyN99hToz. zJfgFJBis3hzmOpldxiGhkhiXPg-- Received: from [76.246.36.168] by web121604.mail.ne1.yahoo.com via HTTP; Sat, 26 Jan 2013 11:25:42 PST X-Rocket-MIMEInfo: 001.001,Q2hhcmxleSwKTGFuY2FpciBzdGFydGVkIGFkZGluZyByZXR1cm4gc3ByaW5ncyBpbnNpZGUgdGhlIHNwb29sIHZhbHZlIGZvciBMZWdhY3kgcHVtcHMgaW4gYWJvdXQgMjAwNS7CoCBPbmUgb2YgdGhlIGNvbnNlcXVlbmNlcyBvZiBkb2luZyB0aGlzIGlzIHdoYXQgeW91IGhhdmUgb2JzZXJ2ZWQgaW4gdGhlIGhhbmdhci7CoCBZb3Ugc29ydCBvZiBoYXZlIGEgJ2dldCBvdXQgb2YgamFpbCBmcmVlJyBjYXJkIGluIHRoYXQgeW91ciBoeWRyYXVsaWMgc3lzdGVtIGhhcyBhIHRocmVlLXdheSB2YWx2ZS7CoCBJdCABMAEBAQE- X-Mailer: YahooMailWebService/0.8.130.494 References: X-Original-Message-ID: <1359228342.18248.YahooMailNeo@web121604.mail.ne1.yahoo.com> X-Original-Date: Sat, 26 Jan 2013 11:25:42 -0800 (PST) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: Thermal influence on Hydraulic Pressure X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-36511695-319075379-1359228342=:18248" ---36511695-319075379-1359228342=:18248 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Charley,=0ALancair started adding return springs inside the spool valve for= Legacy pumps in about 2005.=A0 One of the consequences of doing this is wh= at you have observed in the hangar.=A0 You sort of have a 'get out of jail = free' card in that your hydraulic system has a three-way valve.=A0 It doesn= 't prevent the lock-up.=A0 It just gives you a way out.=A0 Folks installing= the 'Legacy' pump in 300 series plane with a two-way valve can get stuck.= =A0 Fortunately the springs are easily removed and Parker has been providin= g the parts free-of-charge to reset pumps back to the pre-2005 configuratio= n.=0AChris=0A=A0=0AChris Zavatson=0AN91CZ=0A360std. 1,400 hrs=0Ahttp://www.= n91cz.net/=0A =0A=0A________________________________=0A From: Charles Brown= =0ATo: lml@lancaironline.net =0ASent: Friday, Januar= y 25, 2013 11:07 PM=0ASubject: [LML] Re: Thermal influence on Hydraulic Pre= ssure=0A =0A=0AThis 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 o= n flight day. =A0I guess cold temps shrink the fluid and suck more from the= reservoir into the lines, and when it warms, the pressure builds on both s= ides 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.=0A=0ANasty when t= he gear won't retract just after blasting off into a low overcast.=0A=0ACha= rley Brown=0ALegacy #299 =A0200 hr=0A=0AOn Jan 25, 2013, at 7:23 AM, randy = snarr wrote:=0A=0A=0A. 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 wi= ll not move without dumping the pressure. ---36511695-319075379-1359228342=:18248 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
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 h= ydraulic system has a three-way valve.  It doesn't prevent the lock-up= .  It just gives you a way out.  Folks installing the 'Legacy' pu= mp in 300 series plane with a two-way valve can get stuck.  Fortunatel= y the springs are easily removed and Parker has been providing the parts fr= ee-of-charge to reset pumps back to the pre-2005 configuration.
Chris
 
Chris Zavatson
N91CZ
360std. 1,400= hrs

= From: Charles Brown <br= owncc1@verizon.net>
To:= lml@lancaironline.net
Sent:= Friday, January 25, 2013 11:07 PM
Subject: [LML] Re: Thermal influence on Hydraulic P= ressure

=0A
This has happened to me = even at the beginning of a flight, if the temps in the hangar have gone fro= m cold on a previous day, to warm on flight day.  I guess cold temps s= hrink the fluid and suck more from the reservoir into the lines, and when i= t 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 ret= ract 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 on= ce in a while especially when it is cold. The pressures on both sides of th= e system climb due to the engine heat and the gear sometimes will not move = without dumping the pressure.



 
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