X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 23 Dec 2007 12:07:41 -0500 Message-ID: X-Original-Return-Path: Received: from jrcda.com ([206.130.116.53] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2609634 for lml@lancaironline.net; Sat, 22 Dec 2007 06:50:42 -0500 Received-SPF: none receiver=logan.com; client-ip=206.130.116.53; envelope-from=hwasti@lm50.com Received: from [192.168.1.103] (cbl-238-61.conceptcable.com [207.170.238.61] (may be forged)) (authenticated bits=0) by jrcda.com (8.12.11.20060308/8.12.11) with ESMTP id lBMBo17X002143 for ; Sat, 22 Dec 2007 04:50:02 -0700 X-Original-Message-ID: <476CF9ED.6060304@lm50.com> X-Original-Date: Sat, 22 Dec 2007 03:50:05 -0800 From: Hamid Wasti User-Agent: Thunderbird 2.0.0.9 (Windows/20071031) MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] Re: Skoppe lancair 4 pt References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Guy and Jill Foreman wrote: >....just as long as it has its own separate battery backup system. And how exactly will that help the system survive a few hundred amps of induced current on the power line? How will the battery protect the I/O lines? People tend to focus on the power inputs, but the real weak underbelly of the EFIS system are the output lines, such as the serial outputs. They have to be low impedance and are not easy to armor The inputs are a little easier to armor, but if the designers are not fully aware of the issues, the "I am sure this will pass" design may not get very far in actual testing. Regards, Hamid