X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 27 Sep 2007 20:54:17 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-junco.atl.sa.earthlink.net ([209.86.89.63] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2356200 for lml@lancaironline.net; Thu, 27 Sep 2007 19:56:22 -0400 Received-SPF: neutral receiver=logan.com; client-ip=209.86.89.63; envelope-from=mnewman@dragonnorth.com Received: from [70.91.142.49] (helo=PCmike2) by elasmtp-junco.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1Ib3Cs-0007dN-CI for lml@lancaironline.net; Thu, 27 Sep 2007 19:55:47 -0400 From: "Michael Newman" X-Original-To: References: Subject: RE: Lancair Legacy Avionics Master Switch Wiring Question X-Original-Date: Thu, 27 Sep 2007 19:56:28 -0400 Organization: Dragonnorth Group X-Original-Message-ID: <189f01c80162$06e73e60$0601a8c0@sentira.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 In-Reply-To: Thread-Index: AcgA7bWNA/aBjGaVQW6/3b4hkF9C7QAcwXjA X-ELNK-Trace: 4981850a937e3365551c28c27865cf0a239a348a220c260927dd7ce02655d47479d59af0ca3cb6c2a8438e0f32a48e08350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.91.142.49 A simple solution to having an avionics master I have used is to have a switch type circuit breaker that powers the Avionics bus. I like the Potter & Brumfield W31 series try W31X2M1Gxx where xx is the amperage desired. It is possible for the breakers to fail depriving you of avionics. My solution to this problem has been to install two such breaker switches and to only turn on one at a time. I like this better than relays which leave you with a single point of failure that takes out all of the avionics.