Return-Path: Sender: (Marvin Kaye) To: lml Date: Sun, 05 Jan 2003 18:56:05 -0500 Message-ID: X-Original-Return-Path: Received: from hawk.mail.pas.earthlink.net ([207.217.120.22] verified) by logan.com (CommuniGate Pro SMTP 4.0.3) with ESMTP id 1945578 for lml@lancaironline.net; Sun, 05 Jan 2003 16:04:29 -0500 Received: from sdn-ap-003watacop0318.dialsprint.net ([63.187.209.64] helo=f3g6s4) by hawk.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 18VHwV-0004GW-00 for lml@lancaironline.net; Sun, 05 Jan 2003 13:04:24 -0800 X-Original-Message-ID: <005201c2b4fd$eb8b5da0$40d1bb3f@f3g6s4> Reply-To: "Dan Schaefer" From: "Dan Schaefer" X-Original-To: "Lancair list" Subject: Re: Mac Trim Runaway X-Original-Date: Sun, 5 Jan 2003 13:03:37 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 One method I've seen used on some aircraft is to use a stick-mounted normally open trigger-switch (or push-button if your stick can't accommodate a trigger-switch) wired in series with the power to the system that needs protection (in this case, the trim system). To operate the trim, the in-line, or safety switch must be depressed before the desired trim servo can be energized with it's individual switch. Should a servo start to run away, you'll notice it the instant the safety switch is depressed and you can stop it merely by releasing the switch. If you have breakers for each servo, the safety switch can either be a three-pole unit or it can be inserted ahead of the breakers in a common power line. With this method, the breakers can be pulled and the offending system isolated at the pilot's leisure. For the guys that had their trim switches stick, the chance of both switches failing at the same time and in the same manner is miniscule. Dan Schaefer