X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1126621 for flyrotary@lancaironline.net; Wed, 24 May 2006 18:02:09 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=ALVentures@cox.net Received: from BigAl ([72.192.132.90]) by fed1rmmtao10.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060524220122.GQMF18458.fed1rmmtao10.cox.net@BigAl> for ; Wed, 24 May 2006 18:01:22 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: Safety margin assessment Date: Wed, 24 May 2006 15:01:26 -0700 Message-ID: <000001c67f7d$9a74c020$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C67F42.EE15E820" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C67F42.EE15E820 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 I agree that other than a seat-of-the-pants feel that my subsystem's are robust (in the sense of avoiding failure), I have no quantitative = measure of my system's "safety Margin".=20 =20 Would certainly be interesting for everyone to take the 0-10 exam on = their system and report the results of the assessment. Perhaps we might find those above a 5 and give them some careful study. =20 The problem, of course, is that with a one-of-a-kind system 'guessing' = at a number from 1 - 10 is not much different than 'guessing' that your = system is OK in regard to a given condition. The only way to get a numerical rating is to have a large number of systems tested to failure for a = number of different variables. =20 Al G ------=_NextPart_000_0001_01C67F42.EE15E820 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

 

I agree that other than a seat-of-the-pants feel that my subsystem's are robust = (in the sense of avoiding failure), I have no quantitative measure of my = system's "safety Margin". 

  

 Would certainly be interesting for everyone to take the 0-10 exam on their = system and report the results of the assessment.  Perhaps we might find those = above a 5 and give them some careful study.

 

The problem, of course, is that = with a one-of-a-kind system ‘guessing’ at a number from 1 – = 10 is not much  different than ‘guessing’ that your system is OK = in regard to a given condition.  The only way to get a numerical = rating is to have a large number of systems tested to failure for a number of = different variables.

 

Al G

------=_NextPart_000_0001_01C67F42.EE15E820--