X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 27 Feb 2006 17:45:41 -0500 Message-ID: X-Original-Return-Path: Received: from wind.imbris.com ([216.18.130.7] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTPS id 999876 for lml@lancaironline.net; Mon, 27 Feb 2006 11:36:34 -0500 Received-SPF: none receiver=logan.com; client-ip=216.18.130.7; envelope-from=brent@regandesigns.com Received: from [192.168.1.100] (wireless-216-18-135-19.imbris.com [216.18.135.19]) (authenticated bits=0) by wind.imbris.com (8.12.11/8.12.11.S) with ESMTP id k1RGZfD4063480 for ; Mon, 27 Feb 2006 08:35:41 -0800 (PST) (envelope-from brent@regandesigns.com) X-Original-Message-ID: <44032A5D.80409@regandesigns.com> X-Original-Date: Mon, 27 Feb 2006 08:35:41 -0800 From: Brent Regan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: Wow, scary EFIS stuff Content-Type: multipart/alternative; boundary="------------000604000809080502080405" This is a multi-part message in MIME format. --------------000604000809080502080405 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Scary is right. At Chelton, there are two guys that write the application code. For each code writer there are 10 code checkers that scrutinize the code line by line and test every condition and permutation. This is done to meet the software certification requirement s of DO178. Why would an experimental D2 customer care what Chelton does with their certified code? Think about it. The most efficient way (lowest cost) to maintain two software product lines is to make them as common a possible. Why maintain two code bases when you can maintain one and compile it into different versions, and since you already have to do all that pesky testing....... This is common practice among all the EFIS companies with certified products that also license product for the experimental market. Ask ANY EFIS supplier (Chelton, Dynon, BM, OP, GRT) and they will tell you that if they knew how hard it would be to build a reliable EFIS system they would likely have never gotten into the business. Regards Brent Regan --------------000604000809080502080405 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Scary is right.

At Chelton, there are two guys that write the application code. For each code writer there are 10 code checkers that scrutinize the code line by line and test every condition and permutation. This is done to meet the software certification requirement s of DO178.  Why would an experimental D2 customer care what Chelton does  with their certified code?  Think about it. The most efficient way (lowest cost) to maintain two software product lines is to make them as common a possible.  Why maintain two code bases when you can maintain one and compile it into different versions, and since you already have to do all that pesky testing.......

This is common practice among all the EFIS companies with certified products that also license product for the experimental market.

Ask ANY EFIS supplier (Chelton, Dynon, BM, OP,  GRT) and they will tell you that if they knew how hard it would be to build a reliable EFIS system they would likely have never gotten into the business.

Regards
Brent Regan
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