X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 03 Apr 2012 10:21:24 -0400 Message-ID: X-Original-Return-Path: Received: from blu0-omc3-s11.blu0.hotmail.com ([65.55.116.86] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5465953 for lml@lancaironline.net; Mon, 02 Apr 2012 20:01:21 -0400 Received-SPF: neutral receiver=logan.com; client-ip=65.55.116.86; envelope-from=frederickmoreno@bigpond.com Received: from BLU0-SMTP386 ([65.55.116.73]) by blu0-omc3-s11.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 2 Apr 2012 17:00:46 -0700 X-Originating-IP: [121.215.214.127] X-Originating-Email: [frederickmoreno@bigpond.com] X-Original-Message-ID: X-Original-Return-Path: frederickmoreno@bigpond.com Received: from Razzle ([121.215.214.127]) by BLU0-SMTP386.phx.gbl over TLS secured channel with Microsoft SMTPSVC(6.0.3790.4675); Mon, 2 Apr 2012 17:00:45 -0700 MIME-Version: 1.0 X-Original-Date: Tue, 3 Apr 2012 08:00:25 +0800 Content-Type: multipart/alternative; charset="iso-8859-1"; boundary="------------Boundary-00=_POMVIA11VA4000000000" X-Mailer: IncrediMail (6295180) From: Frederick Moreno References: X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 X-Original-To: "Lancair Mail (lml@lancaironline.net)" Subject: Re: [LML] Re: LIV landing gear anomaly X-OriginalArrivalTime: 03 Apr 2012 00:00:45.0865 (UTC) FILETIME=[D1BCB190:01CD112C] --------------Boundary-00=_POMVIA11VA4000000000 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi John: Mains up and then nose up near or at end of mains travel is normal. That is what happens during ground retraction test. Makes it a= ll the more quizzical. =0D =0D Cognoscenti are those "in the know."=0D =0D F =0D =0D =0D =0D =0D -------Original Message-------=0D =0D From: John Barrett=0D Date: 3/04/2012 2:59:50 AM=0D To: lml@lancaironline.net=0D Subject: [LML] Re: LIV landing gear anomaly=0D =0D Hi Fred,=0D Intermittent sticking of the hydraulic gear down lock in the mains comes = to mind, but doesn=92t explain why the nose gear would participate in the an= omaly Could contamination of the system be a factor? Something in the hydrau= lic fluid causing intermittent blockage? =0D Just performed a bunch of retract tests last week on 31VP and I can=92t remember for sure, but seems like the mains start up first and near the e= nd of the main gear travel but before the main gear doors slam shut, the nos= e gear sucks up real fast. Does that sound about right for the IVP system working normally?=0D No cognoscenti here, whatever that is.=0D John=0D =0D From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Frederick Moreno=0D Sent: Monday, April 02, 2012 5:50 AM=0D To: lml@lancaironline.net=0D Subject: [LML] LIV landing gear anomaly =0D =0D Here is an interesting couple of events with nothing relevant found in th= e archives. Aircraft has an estimated 300 take off and landing cycles sin= ce new.=0D =0D About three flights a go I took off and raised the gear. One main came = up, showed yellow, one stayed down and showed green, and the nose stayed down and showed green. Makes for a funny looking light display on the panel. Recycled gear, no problem, and none in subsequent flights. =0D =0D Last flight, after flying an hour to a fly in, staying five hours (cool d= ay) I took off, nose gear retracted and showed yellow, but mains stayed down and showed green. Recycled gear, no problem. =0D =0D When I got home, I jacked up the gear and did various retraction tests. = In each case, the nose came up first and mains followed. A buddy applied ab= out 20-30 pounds of "air load" to the left main before retraction but to no effect. Again, nose came up first and mains followed immediately after = the nose wheel banged against the stop. Hmmmm....=0D =0D Our initial theory was electrical contactor fault, but nothing was found = in ground tests. Initial theories about pressure switch dead band (checked O= K, about 1100 on, 1200-1220 off) went out the window with the results of the ground retraction tests. =0D =0D Thoughts among the landing gear cognoscenti?=0D =0D Fumbling Fred=0D =0D =0D =0D =0D =20 --------------Boundary-00=_POMVIA11VA4000000000 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi John:   Mains up and then nose up near or at end of mai= ns travel is normal.  That is what happens  during ground = retraction test.  Makes it all the more quizzical.
 
Cognoscenti are those "in the know."
 
F 
 
 
 
 
-= ------Original Message-------
 
Date: 3/04/2012 2:= 59:50 AM
Subject: [LML] Re:= LIV landing gear anomaly
 

Hi Fred,

Intermittent sticking of the hydraulic g= ear down lock in the mains comes to mind, but doesn=92t explain why the n= ose gear would participate in the anomaly.  Could contamination of t= he system be a factor?  Something in the hydraulic fluid causing int= ermittent blockage? 

Just performed a bunch of retract tests = last week on 31VP and I can=92t remember for sure, but seems like the mai= ns start up first and near the end of the main gear travel but before the= main gear doors slam shut, the nose gear sucks up real fast.  Does = that sound about right for the IVP system working normally?

No cognoscenti here, whatever that is.

John

 

From: Lancair Mail= ing List [mailto:lml@lancaironline.net] On Behalf Of Frederick Mor= eno
Sent: Monday, April 02, 2012 5:50 AM
To: lml@lanc= aironline.net
Subject: [LML] LIV landing gear anomaly

 

Here is an interesting= couple of events with nothing relevant found in the archives.  = ; Aircraft has an estimated 300 take off and landing cycles since new.

 

<= /DIV>

About three flights a = go I took off and raised the gear.   One main came up, showed y= ellow, one stayed down and showed green, and the nose stayed down and sho= wed green.  Makes for a funny looking light display on the panel.&nb= sp;Recycled gear, no problem, and none in subsequent flights.  =

 

<= /DIV>

Last flight, after fly= ing an hour to a fly in, staying five hours (cool day), I took off, nose = gear retracted and showed yellow, but mains stayed down and showed g= reen.  Recycled gear, no problem.

 

<= /DIV>

When I got home, I jac= ked up the gear and did various retraction tests.  In each case, the= nose came up first and mains followed.  A buddy applied about 20-30= pounds of "air load" to the left main before retraction but to no effect= =2E  Again,  nose came up first and mains followed immediately = after the nose wheel banged against the stop.  Hmmmm....

 

<= /DIV>

Our initial theory was= electrical contactor fault, but nothing was found in ground tests.&= nbsp;Initial theories about pressure switch dead band (checked OK, a= bout 1100 on, 1200-1220 off) went out the window with the results of the = ground retraction tests.

 

<= /DIV>

Thoughts among the lan= ding gear cognoscenti?

 

<= /DIV>

Fumbling Fred

 

<= /DIV>
 
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