X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 06 Feb 2012 12:24:42 -0500 Message-ID: X-Original-Return-Path: Received: from nm36-vm7.bullet.mail.bf1.yahoo.com ([72.30.238.143] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with SMTP id 5384821 for lml@lancaironline.net; Mon, 06 Feb 2012 11:51:19 -0500 Received-SPF: none receiver=logan.com; client-ip=72.30.238.143; envelope-from=randylsnarr@yahoo.com Received: from [98.139.212.150] by nm36.bullet.mail.bf1.yahoo.com with NNFMP; 06 Feb 2012 16:50:45 -0000 Received: from [98.139.212.223] by tm7.bullet.mail.bf1.yahoo.com with NNFMP; 06 Feb 2012 16:50:45 -0000 Received: from [127.0.0.1] by omp1032.mail.bf1.yahoo.com with NNFMP; 06 Feb 2012 16:50:45 -0000 X-Yahoo-Newman-Id: 449732.89957.bm@omp1032.mail.bf1.yahoo.com Received: (qmail 66597 invoked from network); 6 Feb 2012 16:50:45 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Subject:References:From:Content-Type:X-Mailer:In-Reply-To:Message-Id:Date:To:Content-Transfer-Encoding:Mime-Version; b=eBzOAfCJmLIEk1U0qr4hg6x5aBH2jOMvVeh+fBDkFW9G8o04dYoNCVzH+DYZl6Z8ZDBgR5h9a9q+NXWuG2Vo5V7FytUnIxMPr3v3Iq64hK9iaieJky80Rs6km4hbhQ8QB382KNx3jm2GzdzqEFybtd+4CAZy2Gfjr804D19X8iY= ; X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: oj_6tboVM1kNlJ3Y2.nuEd47O1VYeMwUvELoIyQVhYSDyWp UMyTJiBf0YnollHWfDf3jrGRkOHIhDua7xDAOLBLLrMdngF9UPZIvjfy33fM tykIXKqX5kAr.U3cAtwTbdl5tmJm.pvR5jX6P_J3wjuk.vi5zuee3eP4ns8a PXqu.mRza8U_SicB38WdSidK0v8sAeIGQ21JntFYcShq4uz1V4vLwxSxJpH0 S9DeXNSi9HdUBXX2aLo3M7ufG6iQsX.zbprEN7TIco9uV46tWflUmL7mfoYp oWgmdAfq1.UAmQ5FmmQGydwHVkIX_q.5vDqIueLTZBrDnneg10_j1fxKP0eX P5zestlhKZATP88wvs8ujSHFclWXWaTJ3LTbEt4bXJ4kGMfVWHOy8w3LUKyz Eh90HxBo2nTNC5XSxNNoHhdC8dDhLMHCr7nqvoQ9.3hXmjzRu4Cp1SkTsyQ- - X-Yahoo-SMTP: tg4YEXeswBAq79ZTs5A79J5zDY9lAVNV Received: from [192.168.204.217] (randylsnarr@69.169.190.15 with xymcookie) by smtp112-mob.biz.mail.bf1.yahoo.com with SMTP; 06 Feb 2012 08:50:43 -0800 PST Subject: Re: [LML] LNC2 landing gear issue References: From: Randy Content-Type: multipart/alternative; boundary=Apple-Mail-CF2DD5B4-E23A-4305-A8DF-AAF3829E0B54 X-Mailer: iPad Mail (9A334) In-Reply-To: X-Original-Message-Id: X-Original-Date: Mon, 6 Feb 2012 09:50:42 -0700 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-CF2DD5B4-E23A-4305-A8DF-AAF3829E0B54 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Danny, sounds like you have a blockage. (possibly at the gear door valve). Y= ou could install plugs at the cylinders that are working and test and troubl= eshoot again. Most likely something is restricting flow to or from the the s= uspect cylinder as the fluid just moves the piston back and forth so a block= age on either side will cause the gear to not move . You could also remove t= he gear down side line from the suspect cylinder and retest. If the gear goe= s up, you know the problem is on the low pressure return line and if the gea= r still won't go up, you know there is a problem on the high pressure side l= ine feeding the cylinder. I would also check the fittings on the suspect cyl= inder for blockage as well. It is also possible there is something wrong in t= he cylinder itself making it much harder to move which would explain why the= others move and the suspect cylinder moves only with some coaxing.=20 After thinking about this and writing the above, I would remove the suspect c= ylinder and verify it moves freely like it should and there are no blockages= on the fittings. It is also possible you inadvertently pinched an o ring ma= king it more stiff to move than the other 2. When I rebuilt my system, there= are very sharp edges on the grooves that can easily cut and pinch o rings i= f you don't round them off with emery cloth... Fwiw. Randy Snarr N694RS Sent from my iPad On Feb 5, 2012, at 6:41 PM, "Danny" wrote: > My main gear actuators were leaking so I overhauled them. This isn=E2=80=99= t a big deal and I=E2=80=99ve done this numerous times on spam cans with no p= roblems. Upon reinstallation I found two situations; the left main wouldn=E2= =80=99t respond at all; the inboard and nose wheel doors wouldn=E2=80=99t st= ay closed. Since this is a closed system and I could see signs of leakage o= n at least one gear door actuator, I figured before messing with the gear I b= etter rebuild the gear door actuators too. I did that, reassembled everythi= ng, and ran leak checks after cleaning the previous leak mess. Now, this si= tuation remains=E2=80=A6sort of. > =20 > After several gear cycles, the left main wouldn=E2=80=99t break the over c= enter down lock. I decided to tap it with a rubber mallet to break it loose= just to see what happens. At that point the pump kicks on and the wheel go= es up but the doors still bleed down and open after less than a minute. I n= ow have probably a dozen or so gear cycles and, although the left main is no= w responding, it=E2=80=99s the last to do so but only after what must be cal= led a burp in the system. By that, I mean the other two legs go up, the pum= p stops momentarily and then kicks back on to take the last leg up. But, th= e doors still bleed down and come open in less than a minute. I can't see a= ny visible leaks so this tells me there must be an internal leak someplace. = The question is where? Can the sequencing valves cause this or is it the e= mergency extension ball valve or something else? And how do you check these= items for internal leakage? Any suggestions would be appreciated. > =20 > Thanks in advance, > =20 > Danny > LNC2-360, 550 hours > N 38=C2=B0 43' 25.7" > W 77=C2=B0 30' 38.6" > =20 --Apple-Mail-CF2DD5B4-E23A-4305-A8DF-AAF3829E0B54 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Danny, sounds like you hav= e a blockage. (possibly at the gear door valve). You could install plugs at t= he cylinders that are working and test and troubleshoot again. Most likely s= omething is restricting flow to or from the the suspect cylinder as the flui= d just moves the piston back and forth so a blockage on either side will cau= se the gear to not move . You could also remove the gear down side line from= the suspect cylinder and retest. If the gear goes up, you know the problem i= s on the low pressure return line and if the gear still won't go up, you kno= w there is a problem on the high pressure side line feeding the cylinder. I w= ould also check the fittings on the suspect cylinder for blockage as well. I= t is also possible there is something wrong in the cylinder itself making it= much harder to move which would explain why the others move and the suspect= cylinder moves only with some coaxing. 

After= thinking about this and writing the above, I would remove the suspect cylin= der and verify it moves freely like it should and there are no blockages on t= he fittings. It is also possible you inadvertently pinched an o ring making i= t more stiff to move than the other 2. When I rebuilt my system, there are v= ery sharp edges on the grooves that can easily cut and pinch o rings if you d= on't round them off with emery cloth...

Fwiw.
=
Randy Snarr
N694RS

Sent from my iPad

On = Feb 5, 2012, at 6:41 PM, "Danny" <dan= ny@n107sd.com> wrote:

My main gear actuators wer= e leaking so I overhauled them.  This isn=E2=80=99t a big deal and I=E2=80=99ve done this numerous times on= spam cans with no problems.  U= pon reinstallation I found two situations; the left main wouldn=E2=80=99t re= spond at all; the inboard and nose wheel doors wouldn=E2=80=99t stay closed.=   Since this is a closed system= and I could see signs of leakage on at least one gear door actuator, I figu= red before messing with the gear I better rebuild the gear door actuators to= o.  I did that, reassembled eve= rything, and ran leak checks after cleaning the previous leak mess.  Now, this situation remains=E2=80=A6so= rt of.

 

After several gear cycles, the left main w= ouldn=E2=80=99t break the over center down lock.  I decided to tap it with a rubber mallet to break it loos= e just to see what happens.  At= that point the pump kicks on and the wheel goes up but the doors still blee= d down and open after less than a minute.&n= bsp; I now have probably a dozen or so gear cycles and, although the l= eft main is now responding, it=E2=80=99s the last to do so but only after wh= at must be called a burp in the system.&nbs= p; By that, I mean the other two legs go up, the pump stops momentari= ly and then kicks back on to take the last leg up.  But, the doors still bleed down and come open in less t= han a minute.  I can't see any v= isible leaks so this tells me there must be an internal leak someplace.  The question is where?  Can the sequencing valves cause this or is i= t the emergency extension ball valve or something else?  And how do you check these items for internal leak= age?  Any suggestions would be a= ppreciated.

 

= <= span style=3D"mso-bidi-font-size:11.0pt">Thanks in advance,

 

Danny

LNC2-360, 550 ho= urs

N 38=C2=B0 43' 25.7"

=

W 77=C2= =B0 30' 38.6"

 

= --Apple-Mail-CF2DD5B4-E23A-4305-A8DF-AAF3829E0B54--