X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 27 Jun 2008 19:31:06 -0400 Message-ID: X-Original-Return-Path: Received: from gwa2.webcontrolcenter.com ([63.134.207.9] verified) by logan.com (CommuniGate Pro SMTP 5.2.4) with ESMTP id 2993503 for lml@lancaironline.net; Fri, 27 Jun 2008 00:34:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=63.134.207.9; envelope-from=dave@aircraftersllc.com Received: from maila3.webcontrolcenter.com (unverified [216.119.106.29]) by gwa2.webcontrolcenter.com (SurgeMail 3.9c) with ESMTP id 93439691-1777422 for ; Thu, 26 Jun 2008 21:34:04 -0700 X-Original-Return-Path: Received: from h-66-134-42-59.snvacaid.covad.net [66.134.42.59] by maila3.webcontrolcenter.com with SMTP; Thu, 26 Jun 2008 21:33:32 -0700 From: "Dave Saylor" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Runaway Trim X-Original-Date: Thu, 26 Jun 2008 21:33:35 -0700 X-Original-Message-ID: <000f01c8d80e$f744c480$3c34a8c0@GWM350> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01C8D7D4.4AE5EC80" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 thread-index: AcjX+DwW49jELDtjREyeYtYv1VvJlAAE+PIg In-Reply-To: X-Originating-IP: 216.119.106.29 This is a multi-part message in MIME format. ------=_NextPart_000_0010_01C8D7D4.4AE5EC80 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit RAC makes a stick grip with four trim buttons built into the top of it. One of our customers had one that allowed the nose down button to get stuck underneath the upper housing if it was pressed any way but exactly straight down. RAC was very interested in getting it back and replaced it no questions asked. Dave Saylor AirCrafters LLC 140 Aviation Way Watsonville, CA 831-722-9141 831-750-0284 CL www.AirCraftersLLC.com _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Dennis Johnson Sent: Thursday, June 26, 2008 6:51 PM To: lml@lancaironline.net Subject: [LML] Runaway Trim Hi Robert, My understanding from talking with the RAC guys, who make the trim components I installed in my Legacy, is that stuck (runaway) trim is unlikely. (Actually, they said it was impossible, but I find it hard to use that word.) The trim servo must receive power to operate. A runaway can only occur if either the trim switch or the trim relay is stuck in the "on" position. If that happens, moving the trim switch to the opposite position should almost certainly cause the switch or relay to open, clearing the problem. (Wiring faults could also cause runaway trim, but I was careful to protect the wiring when I installed it and therefore do not consider this cause to be a realistic possibility during the time I own my Legacy.) I've given this some thought and have decided that runaway trim is possible, but unlikely. I've decided that the additional parts count and complexity to reduce the chance of an already unlikely runaway trim isn't justified. I've practiced this and believe I can control the airplane with full trim if I slow it down, although my arm would get tired after a while. Best, Dennis Johnson Legacy, 140 hours ------=_NextPart_000_0010_01C8D7D4.4AE5EC80 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

RAC makes a = stick grip=20 with four trim buttons built into the top of it. One of our = customers had=20 one that allowed the nose down button to get stuck underneath the upper = housing=20 if it was pressed any way but exactly straight down. RAC was very=20 interested in getting it back and replaced it no questions=20 asked.

Dave Saylor

AirCrafters LLC

140 Aviation Way

Watsonville, CA

831-722-9141

831-750-0284 CL

www.AirCraftersLLC.com

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of Dennis=20 Johnson
Sent: Thursday, June 26, 2008 6:51 PM
To:=20 lml@lancaironline.net
Subject: [LML] Runaway = Trim

Hi Robert,

My understanding from talking with the RAC guys, who make the trim=20 components I installed in my Legacy, is that stuck (runaway) trim is=20 unlikely. (Actually, they said it was impossible, but I find it = hard to=20 use that word.)

The trim servo must receive power to operate. A runaway = can only=20 occur if either the trim switch or the trim relay is stuck in the "on"=20 position. If that happens, moving the trim switch to the opposite = position=20 should almost certainly cause the switch or relay to open, clearing the=20 problem. (Wiring faults could also cause runaway trim, but I was = careful=20 to protect the wiring when I installed it and therefore do not = consider=20 this cause to be a realistic possibility during the time I own my=20 Legacy.)

I've given this some thought and have decided that runaway trim is=20 possible, but unlikely. I've decided that the additional parts = count and=20 complexity to reduce the chance of an already unlikely runaway=20 trim isn't justified. I've practiced this and believe I can = control=20 the airplane with full trim if I slow it down, although my arm = would get=20 tired after a while.

Best,

Dennis Johnson

Legacy, 140 hours

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