Return-Path: Received: from smtp.burgoyne.com ([209.197.0.17]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Mon, 28 Aug 2000 10:18:48 -0400 Received: from burgoyne.com (pmr.burgoyne.com [209.197.2.90]) by smtp.burgoyne.com (8.9.3/8.9.1) with ESMTP id IAA03820 for ; Mon, 28 Aug 2000 08:25:22 -0600 Message-ID: <39AA6F0C.C38C6F1C@burgoyne.com> Date: Mon, 28 Aug 2000 07:54:20 -0600 From: "C.L.Keller" To: "(LML) Lancair Mail List" Subject: Re: Trim and Pump Relay Circuit Breakers X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Re: trim runaway. With the MAC trim system used on the LNC2 the only way to get trim runaway is for the switch to fail. By the time one realizes what has happened and pulls the breaker the aircraft will be out of trim, perhaps badly so. The question then is the one raised by Rob Wolf: -- Can control be maintained in a 320/360 with full nose-up or nose-down trim? If not, then the problem is not only to stop the runaway, but also to correct it. How about using two trim switches, one a top hat on the stick, the other the conventional MAC rocker switch and use a DPDT selector switch to select the active trim mode. If the active switch fails, it would be a simple matter to deselect it and select the other, allowing the out of trim situation to be corrected. But how serious is this problem? Has anyone ever had a MAC system run away? Charles Keller >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>