X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 04 Apr 2011 15:42:58 -0400 Message-ID: X-Original-Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.125] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4932113 for lml@lancaironline.net; Mon, 04 Apr 2011 11:06:15 -0400 Received-SPF: none receiver=logan.com; client-ip=71.74.56.125; envelope-from=Wolfgang@MiCom.net X-Original-Return-Path: X-Authority-Analysis: v=1.1 cv=qyUSAyc82z9xLljZQc9ErY9Tl2GSEfqK/XYZS35I9d8= c=1 sm=0 a=MHZY6FYWMEQOp7S43i2QIw==:17 a=Ia-xEzejAAAA:8 a=CjxXgO3LAAAA:8 a=ndVRne3UAAAA:8 a=5FIZSGrRAAAA:8 a=pGLkceISAAAA:8 a=AsoAu69UG-iaetF7GPMA:9 a=quNtvimO8shBzvM9vpIA:7 a=QEXdDO2ut3YA:10 a=nrXl3C1RZZ4A:10 a=EzXvWhQp4_cA:10 a=rC2wZJ5BpNYA:10 a=MSl-tDqOz04A:10 a=uH4G0fgkHB9wTKz8AZEA:9 a=aBOg1S7toASCsex16dAA:7 a=MHZY6FYWMEQOp7S43i2QIw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.218.201.50 Received: from [74.218.201.50] ([74.218.201.50:1308] helo=Lobo) by hrndva-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 96/D0-08375-34ED99D4; Mon, 04 Apr 2011 15:05:39 +0000 X-Original-Message-ID: <00dc01cbf2d9$c241ac60$6401a8c0@Lobo> From: "Wolfgang" X-Original-To: References: Subject: Re: [LML] Re: LNC2 Gear Hydraulics X-Original-Date: Mon, 4 Apr 2011 11:05:38 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D9_01CBF2B8.3B052BD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_00D9_01CBF2B8.3B052BD0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable The reason I like my "fixer" module is that it takes care of the problem = without pilot intervention.=20 I like the idea of minimizing pilot workload. All other methods require the pilot to recognize the problem, come to a = conclusion what to, do it and hope that takes care of the problem. Wolfgang -------------------------------------------------------------------------= ------- Why not simply wire up a momentary switch which would close the pressure = switch contacts? Angier Ames N4ZQ -------------------------------------------------------------------------= ------- ----- Original Message -----=20 From: randy snarr=20 To: lml@lancaironline.net=20 Sent: Monday, April 04, 2011 2:40 AM Subject: Re: [LML] Re: LNC2 Gear Hydraulics 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 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 replace the large factory 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 not 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 Keith, You should never have to resort to wrenches to get the wheels = up =E2=80=93and that is not just speaking from a safety perspective. =20 The following is an extract and renumbered set of slides from = a LOBO maintenance seminar on the 320/360 hydraulic system. Slide 21 = shows one possible explanation for your system=E2=80=99s failure to = retract. http://www.n91cz.com/misc/LancairHydraulics-LML.pdf Temperature changes will cause pressure to go up and down, but = should only affect the currently operating side of the system. The = non-operating side should be zero and remain zero unless there is some = other failure or configuration issue. If both operating and = non-operating sides are affected by temperature =E2=80=93 investigate. =20 Note that earlier vintage pumps (~235 era) were internally = different.=20 You may also find some of the following of interest: http://www.n91cz.com/Hydraulics/Lancair_Hydraulics.htm Chris Zavatson N91CZ 360std www.N91CZ.net ---------------------------------------------------------------------- From: 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. Thanks, = Tom, for taking the time so share those experiences! I recently experienced the inability to raise the gear. A = quick call to Rick Argente (Lancair owner/builder in NJ) provided the = solution...bleed the line. He said it's a common issue when flying from = cold locations (NJ) to warmer destinations (Georgia). I also 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. Keith Smith N360JH =20 ------=_NextPart_000_00D9_01CBF2B8.3B052BD0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF
The reason I like my "fixer" module is = that it=20 takes care of the problem without pilot intervention.
I like the idea of minimizing pilot=20 workload.
All other methods require the pilot to = recognize=20 the problem, come to a conclusion what to, do it and hope that takes = care of the=20 problem.
 
Wolfgang
 
Why not simply wire up a momentary switch which would close the = pressure=20 switch contacts?

Angier Ames
N4ZQ
----- Original Message -----
From:=20 randy=20 snarr
Sent: Monday, April 04, 2011 = 2:40=20 AM
Subject: Re: [LML] Re: LNC2 = Gear=20 Hydraulics

Chris,
Both sides of my system rise and fall = with=20 temp...
This is why I installed a dump valve with an extra = line that=20 dumps to zero pounds on both sides when opened rather than just = equalize=20 and still be under pressure. I too used a wrench a few times to = release=20 the pressure. I believe this condition is a little worse in my = plane as=20 I replace the large factory supplied hose with small tight = stainless=20 braid lines that most likely resist expansion more than the big = factory=20 rubber hoses...

RS

"Flight by machines heavier than = air is=20 unpractical and insignificant, if not utterly=20 impossible"
-Simon Newcomb, 1902

--- On Fri, = 4/1/11,=20 Chris Zavatson <chris_zavatson@yahoo.com> = wrote:

From:=20 Chris Zavatson <chris_zavatson@yahoo.com>
Subject: = [LML] Re:=20 LNC2 Gear Hydraulics
To: lml@lancaironline.net
Date: = Friday,=20 April 1, 2011, 8:34 AM

Keith,

You should never have to resort = to wrenches=20 to get the wheels up =E2=80=93and that is not just speaking = from a safety=20 perspective. 

The following is an extract and = renumbered set of=20 slides from a LOBO maintenance seminar on the 320/360 = hydraulic=20 system.  Slide 21 shows one possible = explanation for=20 your system=E2=80=99s failure to retract.

 

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

 

Temperature changes will cause = pressure to=20 go up and down, but should only affect the currently operating = side of=20 the system.  The non-operating side should = be zero=20 and remain zero unless there is some other failure or = configuration=20 issue.   If both operating and = non-operating=20 sides are affected by temperature =E2=80=93 = investigate. =20

 Note that = earlier vintage=20 pumps (~235 era) were internally different.

You may also find some of the = following of=20 interest:

 

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

 

Chris Zavatson

N91CZ

360std

www.N91CZ.net



From: Keith = Smith=20 <keith.smith@gmail.com>
To:=20 lml@lancaironline.net
Sent: Thu, March 31, = 2011=20 12:24:59 PM
Subject:=20 [LML] Re: LNC2 Gear Hydraulics

Quite possibly = one of the=20 best posts I've ever read.  Thanks, Tom, for taking the = time so=20 share those experiences!

I recently experienced the = inability=20 to raise the gear. A quick call to Rick Argente (Lancair = owner/builder=20 in NJ) provided the solution...bleed the line. He said it's a = common=20 issue when flying from cold locations (NJ) to warmer = destinations=20 (Georgia).

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

Keith=20 = Smith
N360JH
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