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,CP1252 X-Google-Thread: 103376,f039470e8f537101 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-07-21 22:12:14 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!canoe.uoregon.edu!arclight.uoregon.edu!wn13feed!wn12feed!worldnet.att.net!204.127.198.203!attbi_feed3!attbi.com!sccrnsc02.POSTED!not-for-mail Message-ID: <3F1CC796.5090907@attbi.com> From: "Robert I. Eachus" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01 X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Ariane5 FAQ References: <1058799152.775376@master.nyc.kbcfp.com> <1058810510.375902@master.nyc.kbcfp.com> <1058813341.841940@master.nyc.kbcfp.com> <1058816605.566685@master.nyc.kbcfp.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit NNTP-Posting-Host: 66.31.71.243 X-Complaints-To: abuse@comcast.net X-Trace: sccrnsc02 1058850731 66.31.71.243 (Tue, 22 Jul 2003 05:12:11 GMT) NNTP-Posting-Date: Tue, 22 Jul 2003 05:12:11 GMT Organization: Comcast Online Date: Tue, 22 Jul 2003 05:12:11 GMT Xref: archiver1.google.com comp.lang.ada:40606 Date: 2003-07-22T05:12:11+00:00 List-Id: Hyman Rosen wrote: > No matter how many times people on this newsgroup repeat this, > it will not become true. The code was written on the assumption > that a certain parameter would never reach a particular value. > Its behavior under the contrary assumption was left unspecified. Incorrect. The behavior was specified. Shutdown the SRI and dump diagnostic information, because this situation could only occur (in the Ariane 4 at least) due to hardware failure. > It certainly did not do "what it was supposed to do" once the > assumption was violated. The system pretended that a hardware > error had happened. The system treated the error as a hardware error because, during the Ariane 4 SRI software development, it was concluded that a hardware error was the only way to get such a reading. The Ariane 4 simply could not move that fast off the pad. Now if an Ariane 4 exploded during takeoff, it might send the SRI and its accelerometers flying fast enough to trigger that hardware diagnostic. But that certainly would have been a hardware failure. -- Robert I. Eachus �In an ally, considerations of house, clan, planet, race are insignificant beside two prime questions, which are: 1. Can he shoot? 2. Will he aim at your enemy?� -- from the Laiden novels by Sharon Lee and Steve Miller.