From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,f039470e8f537101 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-07-21 15:15:03 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.ems.psu.edu!news.cse.psu.edu!uwm.edu!newsfeed.cs.utexas.edu!geraldo.cc.utexas.edu!not-for-mail From: "Bobby D. Bryant" Newsgroups: comp.lang.ada Subject: Re: Ariane5 FAQ Date: Mon, 21 Jul 2003 16:03:20 -0600 Organization: dis- Message-ID: References: <1058799152.775376@master.nyc.kbcfp.com> <1058810510.375902@master.nyc.kbcfp.com> <1058813341.841940@master.nyc.kbcfp.com> NNTP-Posting-Host: dial-103-7.ots.utexas.edu Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: geraldo.cc.utexas.edu 1058825045 13753 128.83.176.55 (21 Jul 2003 22:04:05 GMT) X-Complaints-To: abuse@utexas.edu NNTP-Posting-Date: Mon, 21 Jul 2003 22:04:05 +0000 (UTC) User-Agent: Pan/0.14.0 (I'm Being Nibbled to Death by Cats!) Xref: archiver1.google.com comp.lang.ada:40589 Date: 2003-07-21T16:03:20-06:00 List-Id: On Mon, 21 Jul 2003 14:49:01 -0400, Hyman Rosen wrote: > Vinzent Hoefler wrote: >> Let me try an analogy: If you take the brake controller software from >> one car and put it in a different one, what *reason* makes you believe >> it would work properly? > > But it wasn't just the software. The inertial reference system hardware > was taken unchanged from the Ariane 4 to the Ariane 5. While it turned > out in retrospect that there were reasons why the software which worked > in the Ariane 4 did not work in the Ariane 5, that is a far, far cry > from saying that "there were no reasons to expect that it should work > for this new rocket." The new rocket had more thrust. There's absolutely no reason to suppose that such a part and its software will work in one mission envelope just because it worked perfectly in a different one. And it didn't "turn out in retrospect". The error was _discovered_ in retrospect, but the error was made up front and was avoidable. -- Bobby Bryant Austin, Texas