X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 04 Apr 2011 02:40:56 -0400 Message-ID: X-Original-Return-Path: Received: from nm21.bullet.mail.ne1.yahoo.com ([98.138.90.84] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with SMTP id 4930099 for lml@lancaironline.net; Fri, 01 Apr 2011 23:26:26 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.90.84; envelope-from=randylsnarr@yahoo.com Received: from [98.138.90.51] by nm21.bullet.mail.ne1.yahoo.com with NNFMP; 02 Apr 2011 03:25:52 -0000 Received: from [98.138.89.196] by tm4.bullet.mail.ne1.yahoo.com with NNFMP; 02 Apr 2011 03:25:52 -0000 Received: from [127.0.0.1] by omp1054.mail.ne1.yahoo.com with NNFMP; 02 Apr 2011 03:25:52 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 567634.5826.bm@omp1054.mail.ne1.yahoo.com Received: (qmail 57729 invoked by uid 60001); 2 Apr 2011 03:25:52 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=D9JWYgZr/HdZZ7DFaPN6A4a7G1Q0/mKDYkRuufiwaF6ETaZm+dW1bIKNW1p1gzEO6Rfr0+UrolWRC7pB3BeoDa9s2ky2PJvwkqX4Mw0oSguI7W7mbUHfqdKqE2N7Y2/BKsEfr8hnfWtp/HuEOgE+GD78Egl/RlivVklMC4So1Ng=; X-Original-Message-ID: <931014.36889.qm@web111401.mail.gq1.yahoo.com> X-YMail-OSG: _8WwspYVM1lay4lnJe3bNXf0QVECZvyllqXryEIRQklrxUE RuZJ9xU0nUK0LfC7PBbIFvY0KxIcbjm08Vhqe7fzgbNof6EI55p5dPNr1IxO cjxEK3w26rkAtBGyJFAR.1A2gMXow_aQqufqK6RhYsVHZps2gb_hlad8hUBV .rCvBXXPYTY1NVsaoYmNVCPA.WZBPchQhJpCldc9PVgyRh3NZMLP1oOZ8sEg QpaPFqibrJv8JI.9Lnf1G09BgmyNu8_nAwS84qYlGdbuK4IklVgG3ZPYP18T FvrmUwMJzbPvR3xBfHSDzU6tmgSc2D5R4XoukhXYqhR5hpQeStLJn6ZxW.DK LSH0GrLtUK6RrmmL.75ayGJcxjXlRyxaylt5jReE4QxpzIg.sCm4dkO.s7ys lagjjtLtorsSMog-- Received: from [76.8.220.21] by web111401.mail.gq1.yahoo.com via HTTP; Fri, 01 Apr 2011 20:25:51 PDT X-Mailer: YahooMailClassic/12.0.2 YahooMailWebService/0.8.109.295617 X-Original-Date: Fri, 1 Apr 2011 20:25:51 -0700 (PDT) From: randy snarr Subject: Re: [LML] Re: LNC2 Gear Hydraulics X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-443661241-1301714751=:36889" --0-443661241-1301714751=:36889 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Chris, Both sides of my system rise and fall with temp... This is why I installed a dump valve with an extra line that dumps to zero = pounds on both sides when opened rather than just equalize and still be und= er pressure. I too used a wrench a few times to release the pressure. I bel= ieve this condition is a little worse in my plane as I replace the large fa= ctory supplied hose with small tight stainless braid lines that most likely= resist expansion more than the big factory rubber hoses... RS "Flight by machines heavier than air is unpractical and insignificant, if n= ot utterly impossible" -Simon Newcomb, 1902 --- On Fri, 4/1/11, Chris Zavatson wrote: From: Chris Zavatson Subject: [LML] Re: LNC2 Gear Hydraulics To: lml@lancaironline.net Date: Friday, April 1, 2011, 8:34 AM =0AKeith,=0AYou should never have to resort to wrenches to get the wheels u= p =E2=80=93and that is not just speaking from a safety perspective.=C2=A0 = =0AThe following is an extract and renumbered set of slides from a LOBO mai= ntenance seminar on the 320/360 hydraulic system.=C2=A0 Slide 21 shows one = possible explanation for your system=E2=80=99s failure to retract.=0A=C2=A0= =0Ahttp://www.n91cz.com/misc/LancairHydraulics-LML.pdf=0A=C2=A0 =0ATempera= ture changes will cause pressure to go up and down, but should only affect = the currently operating side of the system.=C2=A0 The non-operating side sh= ould be zero and remain zero unless there is some other failure or configur= ation issue. =C2=A0=C2=A0If both operating and non-operating sides are affe= cted by temperature =E2=80=93 investigate.=C2=A0 =0A=C2=A0Note that earlier= vintage pumps (~235 era) were internally different. =0AYou may also find s= ome of the following of interest:=0A=C2=A0 =0Ahttp://www.n91cz.com/Hydrauli= cs/Lancair_Hydraulics.htm=0A=C2=A0 =0AChris Zavatson=0AN91CZ=0A360std=0Awww= .N91CZ.net =0A =0A=0A=0AFrom: Keith Smith To: lml@lancaironline.net Sent: Thu, March 31, 2011 12:24:59 PM Subject: [LML] Re: LNC2 Gear Hydraulics Quite possibly one of the best posts I've ever read.=C2=A0 Thanks, Tom, for= taking the time so share those experiences! I recently experienced the inability to raise the gear. A quick call to Ric= k Argente (Lancair owner/builder in NJ) provided the solution...bleed the l= ine. He said it's a common issue when flying from cold locations (NJ) to wa= rmer destinations (Georgia). I also get hear the pump activate in flight for a fraction of a second ever= y 20-30 minutes or so, which I suspect points to a leak of some sort. Keith Smith N360JH --0-443661241-1301714751=:36889 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Chris,
Both sides of my system rise and fa= ll with temp...
This is why I installed a dump valve with an extra line = that dumps to zero pounds on both sides when opened rather than just equali= ze and still be under pressure. I too used a wrench a few times to release = the pressure. I believe this condition is a little worse in my plane as I r= eplace the large factory supplied hose with small tight stainless braid lin= es that most likely resist expansion more than the big factory rubber hoses= ...

RS

"Flight by machine= s heavier than air is unpractical and insignificant, if not utterly impossi= ble"
-Simon Newcomb, 1902

--- On Fri, 4/1/11, Chris Zav= atson <chris_zavatson@yahoo.com> wrote:

From: Chris Zavatson <chris_zavatson@yahoo.com>
Subject= : [LML] Re: LNC2 Gear Hydraulics
To: lml@lancaironline.net
Date: Frid= ay, April 1, 2011, 8:34 AM

=0A

Keith,

=0A

You should ne= ver have to resort to wrenches to get the wheels up =E2=80=93and that is no= t just speaking from a safety perspective. 

=0A

The following is an extract and= renumbered set of slides from a LOBO maintenance seminar on the 320/360 hy= draulic system.  Slide 21 shows one possible e= xplanation for your system=E2=80=99s failure to retract.

=0A

 

=0A

http://ww= w.n91cz.com/misc/LancairHydraulics-LML.pdf

=0A

 

=0A

Temperature chan= ges will cause pressure to go up and down, but should only affect the curre= ntly operating side of the system.  The non-op= erating side should be zero and remain zero unless there is some other fail= ure or configuration issue.   If both ope= rating and non-operating sides are affected by temperature =E2=80=93 invest= igate. 

=0A

 Note that earlier vintage pumps= (~235 era) were internally different.

=0A

You may also find some of the following of interest:

= =0A

 

=0A

http://www.n91cz.com/Hydraulics= /Lancair_Hydraulics.htm

=0A

 

=0A

Chris Zavatson

=0A

N91CZ

=0A

360std<= /p>=0A

www.N91CZ.net


=0A

=0A=0A
=0AFrom: Keith Smith <keith.smith@gmail.= com>
To: lml@lancair= online.net
Sent: Thu, M= arch 31, 2011 12:24:59 PM
Subject:= [LML] Re: LNC2 Gear Hydraulics

Quite possibly one= of the best posts I've ever read.  Thanks, Tom, for taking the time s= o share those experiences!

I recently experienced the inability to r= aise the gear. A quick call to Rick Argente (Lancair owner/builder in NJ) p= rovided the solution...bleed the line. He said it's a common issue when fly= ing from cold locations (NJ) to warmer destinations (Georgia).

I als= o get hear the pump activate in flight for a fraction of a second every 20-= 30 minutes or so, which I suspect points to a leak of some sort.

Kei= th Smith
N360JH
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