X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 22 Apr 2014 15:04:35 -0400 Message-ID: X-Original-Return-Path: Received: from ndjsnpf01.ndc.nasa.gov ([198.117.1.121] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 6842447 for lml@lancaironline.net; Tue, 22 Apr 2014 12:55:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=198.117.1.121; envelope-from=valin.b.thorn@nasa.gov Received: from ndmsppt102.ndc.nasa.gov (ndmsppt102.ndc.nasa.gov [198.117.0.67]) by ndjsnpf01.ndc.nasa.gov (Postfix) with ESMTP id 69470D0466 for ; Tue, 22 Apr 2014 11:51:47 -0500 (CDT) Received: from NDMSCHT104.ndc.nasa.gov (ndmscht104-pub.ndc.nasa.gov [198.117.0.204]) by ndmsppt102.ndc.nasa.gov (8.14.5/8.14.5) with ESMTP id s3MGsoQT011643 for ; Tue, 22 Apr 2014 11:54:50 -0500 Received: from NDMSMBX402.ndc.nasa.gov ([169.254.2.176]) by NDMSCHT104.ndc.nasa.gov ([198.117.0.204]) with mapi id 14.03.0174.001; Tue, 22 Apr 2014 11:54:50 -0500 From: "Thorn, Valin B. (JSC-VA411)" X-Original-To: Lancair Mailing List X-Original-CC: "Thorn, Valin B. (JSC-VA411)" Subject: RE: [LML] Gear Down...INOP Thread-Topic: [LML] Gear Down...INOP Thread-Index: AQHPXXi4aShQggsvUEq/ScT6JbTwq5sd2Vhg X-Original-Date: Tue, 22 Apr 2014 16:54:49 +0000 X-Original-Message-ID: <0705A91F9164914998F23A2F0BB661A913DE1F@NDMSMBX402.ndc.nasa.gov> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [66.35.45.94] Content-Type: multipart/alternative; boundary="_000_0705A91F9164914998F23A2F0BB661A913DE1FNDMSMBX402ndcnasa_" MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.11.96,1.0.14,0.0.0000 definitions=2014-04-22_06:2014-04-22,2014-04-22,1970-01-01 signatures=0 --_000_0705A91F9164914998F23A2F0BB661A913DE1FNDMSMBX402ndcnasa_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks Chris. At lunch I looked over your excellent report on the 320/360 and Legacy hydr= aulic systems. We have the pre-2005 Legacy hydraulic pump we'd modified fo= r 28 VDC and changed to the high capacity pump. I'd never heard anything f= rom Lancair about a change in the internals as you described it - symmetric= spool, spool centering springs, 150 psi backpressure circuit removed, etc. Of course we have the three way dump valve to handle the hydraulic cylinder= rod retraction/extension on dump valve activation. But, it seems everythi= ng thing else must be 320/360 type internal on the spool and backpressure c= ircuit. I'm not sure what changes we should make, if any, to have a system that isn= 't prone to these pressure lock ups with temperature changes... Suggestion= s? I think William Ford's Legacy kit number is close to ours so he likely = has a similar setup... Thanks again, Valin Thorn Legacy Project Boulder, Colorado From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Chri= s Zavatson Sent: Monday, April 21, 2014 9:44 AM To: lml@lancaironline.net Subject: [LML] Gear Down...INOP William, My email has been bouncing LML messages recently. I saw your question on t= he archive list. see page 10 here http://www.n91cz.net/Hydraulics/Lancair%20Hydraulics.pdf The above describes the extension failure mode in a 320/360. I haven't stu= died the Legacy system relative to this failure mode -may or may not be ap= plicable. Do you have pressure gauges? The readings during gear extension= s and especially during this failure would be most helpful in identifying t= he cause. Chris Zavatson N91CZ 360std www.N91CZ.net --_000_0705A91F9164914998F23A2F0BB661A913DE1FNDMSMBX402ndcnasa_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thanks Chris. = ;

 <= /span>

At lunch I looked = over your excellent report on the 320/360 and Legacy hydraulic systems.&nbs= p; We have the pre-2005 Legacy hydraulic pump we’d modified for 28 VDC and changed to the high capacity pump.  I’d never heard = anything from Lancair about a change in the internals as you described it &= #8211; symmetric spool, spool centering springs, 150 psi backpressure circu= it removed, etc.

 <= /span>

Of course we have = the three way dump valve to handle the hydraulic cylinder rod retraction/ex= tension on dump valve activation.  But, it seems everything thing else must be 320/360 type internal on the spool and backpressure cir= cuit. 

 <= /span>

I’m not sure= what changes we should make, if any, to have a system that isn’t pro= ne to these pressure lock ups with temperature changes…  Suggest= ions?  I think William Ford’s Legacy kit number is close to ours so he like= ly has a similar setup…

 <= /span>

Thanks again,=

 <= /span>

Valin Thorn

Legacy Project

Boulder, Colorado<= o:p>

 <= /span>

 <= /span>

From: Lancair = Mailing List [mailto:lml@lancaironline.net] On Behalf Of Chris Zavatson
Sent: Monday, April 21, 2014 9:44 AM
To: lml@lancaironline.net
Subject: [LML] Gear Down...INOP

 

William,

My email has been bouncing LML messages recently. = I saw your question on the archive list.

see page 10 here

The above describes the extension failure mode in a 320= /360.  I haven't studied the Legacy system relative to this failure mo= de  -may or may not be applicable.  Do you have pressure gauges?  The readings during gear extensions and especi= ally during this failure would be most helpful in identifying the= cause.

 

Chris Zavatson

N91CZ

360std

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