X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 19 Jan 2012 09:01:32 -0500 Message-ID: X-Original-Return-Path: Received: from wolverine.webiness.com ([65.61.103.66] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTPS id 5355741 for lml@lancaironline.net; Wed, 18 Jan 2012 21:45:17 -0500 Received-SPF: none receiver=logan.com; client-ip=65.61.103.66; envelope-from=brent@regandesigns.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=regandesigns.com; h=Received:Message-ID:Date:From:User-Agent:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type; b=LvSZkgb979tC/f+l4v71NJK/LdqZPWC0RJ8KgpbTpK0oNXGNQQtK/Nb2SujDXQ73e5ijhEIt1Dz7qxjNEOxMiVbJtO9mOHQY7/t1kzkIq/DuTRaqO1GKxMFUOPmzV5qO; Received: from [50.37.135.172] (helo=[192.168.1.102]) by wolverine.webiness.com with esmtpa (Exim 4.69) (envelope-from ) id 1RnivI-00068p-Fl; Wed, 18 Jan 2012 19:44:24 -0800 X-Original-Message-ID: <4F178391.60307@regandesigns.com> X-Original-Date: Wed, 18 Jan 2012 18:44:33 -0800 From: Brent Regan User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 MIME-Version: 1.0 X-Original-To: mnewman@dragonnorth.com X-Original-CC: lml@lancaironline.net Subject: Re: Steam Gauge Backup References: <006d01ccd64f$a96aa200$fc3fe600$@com> In-Reply-To: <006d01ccd64f$a96aa200$fc3fe600$@com> Content-Type: multipart/alternative; boundary="------------070603080009000208010004" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - wolverine.webiness.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - regandesigns.com This is a multi-part message in MIME format. --------------070603080009000208010004 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Not my system. Please note my post was quoting Ed Gray. As a developer of certified PFDs, MFD, ADAHRS, MSUs, etc. I agree with Michael. If you plan to fly IMC without a spinning mass backup OR a certified EFIS then you are "Dead Man Flying". I have destroyed too much equipment during per-qualification testing of certified equipment and have done too many post crash analysis for the NTSB to have any other opinion. Regards Brent Regan On 1/18/2012 6:11 PM, Michael Newman wrote: > Your dual systems are running the same software. Which (in my opinion as a > developer of such software) is the MOST LIKELY point of failure in the > system. > > > _*Ed Gray*_ writes: "I have no steam gage backups. With dual screens, > backup batteries and dual ADHRS I feel that I have enough redundancy. > Does anyone have input or comment? This plane may be one of the first > with no round gauges anywhere."(sic) > > --------------070603080009000208010004 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Not my system. Please note my post was quoting Ed Gray.

As a developer of certified PFDs, MFD, ADAHRS, MSUs, etc. I agree with Michael.

If you plan to fly IMC without a spinning mass backup OR a certified EFIS then you are "Dead Man Flying".

I have destroyed too much equipment during per-qualification testing of certified equipment and have done too many post crash analysis for the NTSB to have any other opinion.

Regards
Brent Regan

On 1/18/2012 6:11 PM, Michael Newman wrote: 
Your dual systems are running the same software. Which (in my opinion as a
developer of such software) is the MOST LIKELY point of failure in the
system.


Ed Gray writes: "I have no steam gage backups.  With dual screens, 
backup batteries and dual ADHRS I feel that I have enough redundancy.  
Does anyone have input or comment?  This plane may be one of the first 
with no round gauges anywhere."(sic)
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