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!news.dns-netz.com!news.freedyn.net!newsreader4.netcologne.de!news.netcologne.de!peer01.ams1!peer.ams1.xlned.com!news.xlned.com!peer01.am4!peer.am4.highwinds-media.com!peer03.iad!feed-me.highwinds-media.com!news.highwinds-media.com!feeder.usenetexpress.com!tr1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!buffer1.nntp.dca1.giganews.com!buffer2.nntp.dca1.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 08 Nov 2019 09:32:35 -0600 From: Dennis Lee Bieber Newsgroups: comp.lang.ada Subject: Re: Boeing 737 and 737 MAX software Date: Fri, 08 Nov 2019 10:32:36 -0500 Organization: IISS Elusive Unicorn Message-ID: References: <8736mwi257.fsf@nightsong.com> <5rnhael4n4dunnbrcs5o2t5tnua2t3iunh@4ax.com> <87bltn9nmy.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-PqjdEj/5YrspoJfLg/Ke3EQ3DXBH7/DOqm2kG1I6LYIYKejyEY3/uDSrkhqqKC5hjPp2gP+L1Yd8bI8!DpsAD0b1z92820q6LoV54qjGdB8IYh09oxTJFtTOouXGDG/mc+HVuwdgGlJJ/IYs8funVOfe 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: 3044 X-Received-Bytes: 3379 X-Received-Body-CRC: 3411652311 Xref: reader01.eternal-september.org comp.lang.ada:57523 Date: 2019-11-08T10:32:36-05:00 List-Id: On Thu, 07 Nov 2019 17:12:53 -0800, Paul Rubin declaimed the following: >Dennis Lee Bieber writes: >> Unless things have changed severely -- GE Aviation (formerly Smith's >> Aerospace, formerly Lear Siegler) produces the 737 FMS software (and also >> the processor boxes). > >It looks like Collins Aerospace (formerly Rockwell Collins) is now >getting some heat over the flight deck software: > >https://www.nytimes.com/2019/11/07/business/boeing-737-max-collins.html Though "the displays" don't really process sensor information. The FMS sends display instructions to the display boxes, which then format and render the actual screens. Unless they believe the display boxes should have taking those display instructions and done local matching (for example, AoA sensor vs a gyro pitch angle, and then "red-flagged" the display of those items). If Collins is now building the FMS processor boxes, they must be building them to the same specification as the GE boxes -- since the "BootROM" which GE provided the older boxes underwent updates for the MAX model, yet was tested on the same old processor boxes (It won't run on the very oldest as those had a different memory map -- pre-MAX BootROM used a memory layout that was common to both generations of processor boxes; the MAX software moved some stuff into a region that doesn't exist on the oldest). I'm fairly certain that the FMS for MAX was also GE effort -- though that may have been the waypoint/navigation/routing/fuel management stuff, with Collins maybe doing the sensor and flight control integration stuff. {I'd been on the BootROM/"platform" side of the building, FMS was another room} -- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/