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=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!weretis.net!feeder6.news.weretis.net!feeder.usenetexpress.com!feeder-in1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!buffer1.nntp.dca1.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Sat, 29 Jun 2019 11:29:48 -0500 From: Dennis Lee Bieber Newsgroups: comp.lang.ada Subject: Re: Boeing 737 and 737 MAX software Date: Sat, 29 Jun 2019 12:29:49 -0400 Organization: IISS Elusive Unicorn Message-ID: <8s3fhe12kpka8qfnn8p76qqfelipsc0ec4@4ax.com> References: <8736mwi257.fsf@nightsong.com> <5rnhael4n4dunnbrcs5o2t5tnua2t3iunh@4ax.com> <87v9wpe0k7.fsf@nightsong.com> <87o92hdpsg.fsf@nightsong.com> User-Agent: ForteAgent/8.00.32.1272 X-No-Archive: YES MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-DKsIDMtJYkAdMHobPzMsPNRtVg9Btv4vCrMFOdi/wkts8B9jAnnhDJR9lFufEaBsFHC4xI6JWVC0Il2!lfQCvLERfNlIkejL0Zo1j800Csn46mKGu6UpitHgORcqzkVSTXNXvbihVyzKABTa1fl11tMl X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 X-Original-Bytes: 2415 Xref: reader01.eternal-september.org comp.lang.ada:56791 Date: 2019-06-29T12:29:49-04:00 List-Id: On Fri, 28 Jun 2019 20:38:23 -0700, Paul Rubin declaimed the following: > >Ah, good point, though I wonder if the news article is implying that the >software is connected to the crashes in some way. Separate question: >would MCAS count as part of the FMS? Just wondering. Well, based upon https://aviation.stackexchange.com/questions/54545/is-the-737s-autopilot-part-of-the-fms-or-is-it-a-separate-entity "FMS" is the entire system including the displays, while the FMC is the computer that is in charge of the flight management (waypoints, fuel usage, etc. and distributing data to the other components) while the "autopilot" is another component. I'd expect MCAS to be software in the FMC component. I'm probably a bit sloppy in that I tend to read "FMS" as "Flight Management SOFTWARE" which resides in the FMC (a 68040 processor -- the code I worked on assumed 30MHz, but I've read an article indicating the processor clock itself is twice that -- original FMC models were 20MHz [40?]). -- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/