X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 02 Apr 2012 14:59:36 -0400 Message-ID: X-Original-Return-Path: Received: from carbinge.com ([69.5.27.218] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with SMTP id 5465438 for lml@lancaironline.net; Mon, 02 Apr 2012 12:11:03 -0400 Received-SPF: none receiver=logan.com; client-ip=69.5.27.218; envelope-from=jbarrett@carbinge.com Received: (qmail 31527 invoked from network); 2 Apr 2012 16:10:28 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; h=X-Originating-IP:Reply-To:From:To:References:In-Reply-To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language; s=default; d=carbinge.com; b=jm0w9CCqbq0rEcjWbo6X3jFZrzJAopa9mRW2y0RtgmUuC4UP9iVeBVgFKE3IMhIz2izOPJhD5Bh6iQjGKHGtkvIbEaCDOhVWNcaZxHVIGiCcyr2YyUwxMMYVIT48x96XPrpytAHwzEirMvSUYhKi+aQymLBg2uTejnJj/H14ZnY=; X-Originating-IP: [24.143.114.61] Reply-To: From: "John Barrett" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] LIV landing gear anomaly X-Original-Date: Mon, 2 Apr 2012 09:10:27 -0700 X-Original-Message-ID: <017701cd10eb$1eb0bab0$5c123010$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0178_01CD10B0.7251E2B0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Ac0QzzGZrhla5szFRKSiOnMmsc67GQAGvTTA Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_0178_01CD10B0.7251E2B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi Fred, Intermittent sticking of the hydraulic gear down lock in the mains comes to mind, but doesn't explain why the nose gear would participate in the anomaly. Could contamination of the system be a factor? Something in the hydraulic fluid causing intermittent blockage? Just performed a bunch of retract tests last week on 31VP and I can't remember for sure, but seems like the mains 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 Mailing List [mailto:lml@lancaironline.net] On Behalf Of Frederick Moreno Sent: Monday, April 02, 2012 5:50 AM To: lml@lancaironline.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. 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. Last flight, after flying 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 green. Recycled gear, no problem. 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 about 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.... Our initial theory was electrical contactor fault, but nothing was found in ground tests. Initial theories about pressure switch dead band (checked OK, about 1100 on, 1200-1220 off) went out the window with the results of the ground retraction tests. Thoughts among the landing gear cognoscenti? Fumbling Fred ------=_NextPart_000_0178_01CD10B0.7251E2B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Fred,

Intermittent sticking of the hydraulic gear down lock in the mains = comes to mind, but doesn’t explain why the nose gear would = participate in the anomaly.  Could contamination of the system be a = factor?  Something in the hydraulic fluid causing intermittent = blockage? 

Just performed a bunch of retract tests last week on 31VP and I = can’t remember for sure, but seems like the mains 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 Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Frederick Moreno
Sent: Monday, April 02, 2012 5:50 = AM
To: lml@lancaironline.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.

 

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. 

 

Last = flight, after flying 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 green.  Recycled gear, no problem. =

 

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 about 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....

 

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

 

Thoughts among the landing = gear cognoscenti?

 

Fumbling = Fred

 

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