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.linkpendium.com!news.linkpendium.com!news.snarked.org!border2.nntp.dca1.giganews.com!nntp.giganews.com!buffer2.nntp.dca1.giganews.com!buffer1.nntp.dca1.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 28 Jun 2019 21:52:55 -0500 From: Dennis Lee Bieber Newsgroups: comp.lang.ada Subject: Re: Boeing 737 and 737 MAX software Date: Fri, 28 Jun 2019 22:52:56 -0400 Organization: IISS Elusive Unicorn Message-ID: References: <8736mwi257.fsf@nightsong.com> <5rnhael4n4dunnbrcs5o2t5tnua2t3iunh@4ax.com> <87v9wpe0k7.fsf@nightsong.com> User-Agent: ForteAgent/8.00.32.1272 X-No-Archive: YES MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-va6p4P0Pak9HWUHLQbw4Li+QlQzJNBmZZqQgl04H2RrkOCSfI7NBgUCBmXykR/DYZoM2xLSu/8QBbu9!112vhYmTlosydYOJdHFdUpdyd4iH55yTsyWasj6onVa9uLGFeYfx/yCYHeKGO47wB7h65VHu 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: 3343 Xref: reader01.eternal-september.org comp.lang.ada:56786 Date: 2019-06-28T22:52:56-04:00 List-Id: On Fri, 28 Jun 2019 16:45:44 -0700, 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). > >Don't know if this is the FMS but it sounds like things may have changed: > >https://www.bloomberg.com/news/articles/2019-06-28/boeing-s-737-max-software-outsourced-to-9-an-hour-engineers > Note that the article emphasizes """ Based on resumes posted on social media, HCL engineers helped develop and test the Max’s flight-display software, while employees from another Indian company, Cyient Ltd., handled software for flight-test equipment. """ Flight displays are separate processors that receive "instructions" from the FMS on what to display (and flight-test equipment, to me, is not flight software/hardware itself, but instead may be a ground-based console to emulate flight sensors and inputs). Overly simplifying -- it's like the ubiquitous 2line x 16character LCDs... the display has to interpret the drawing instructions sent from the main application processor, but is not controlling the aircraft itself.. I'll concede I don't know who actually built the display/keyboard units used for input to the FMS (and the other displays of the "glass cockpit" are another matter -- during my short four years the "autopilot" and other displays were simulated on Windows boxes for testing FMS software and flight boxes. [I envied those testers -- they got to use a TCP "dataloader" to the test boxes... I had to test the "bootrom" using the floppy disk "field" dataloader -- which took hours just to load the FMS software; a full test took two 5 hour sessions to load FMS, databases, verify it wouldn't load oversize database on older flight boxes, verify dataload option disappears from menu system when (simulated) aircraft is in the air (no load on suspension)...]) -- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/