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 X-Received: by 2002:a0c:d034:: with SMTP id u49mr7779173qvg.23.1555107313061; Fri, 12 Apr 2019 15:15:13 -0700 (PDT) Path: eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!news.gegeweb.eu!gegeweb.org!usenet-fr.net!proxad.net!feeder1-2.proxad.net!209.85.160.216.MISMATCH!t9no2274578qtn.0!news-out.google.com!i54ni1222qte.0!nntp.google.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!buffer1.nntp.dca1.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 12 Apr 2019 17:15:08 -0500 From: Dennis Lee Bieber Newsgroups: comp.lang.ada Subject: Re: Boeing 737 and 737 MAX software Date: Fri, 12 Apr 2019 18:15:07 -0400 Organization: IISS Elusive Unicorn Message-ID: References: <8736mwi257.fsf@nightsong.com> <2590d3d8-5f91-4f59-897e-e0c9b7e1b5ca@googlegroups.com> User-Agent: ForteAgent/8.00.32.1272 X-No-Archive: YES MIME-Version: 1.0 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-7v3JGk+V0QAd2g67obwXbPRqxwIACK+vgvCMsL4/YorXa87aH3Z1Pj0VBlkSTZcsmVYZ5Tx985alDr+!dQfdJ/C4PIpj6v719tOVKp7rmh98bb43HQKD92wAOKJVqhjW1gm92m1uaJ+6FuH8X0VUBtZt 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: 2347 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Xref: reader01.eternal-september.org comp.lang.ada:56124 Date: 2019-04-12T18:15:07-04:00 List-Id: On Fri, 12 Apr 2019 00:46:31 -0700 (PDT), tranngocduong@gmail.com declaimed the following: > >I know nothing about the software. But I don't think it is written in Ada. If it was, programmers must have chosen a wrong subtype. > It's Ada... (In the past, I was doing maintenance on the FMS "BootROM" code -- which, while not the actual run-time flight software, is responsible for doing CRC checks of the software and databases, reading new software from dataloaders, and loading which application is to run based upon external settings. The FMS software links with the same base "OS". >In the crashed Ethiopian 302 aircraft, ~30 seconds before impact, the nose points 40 deg. toward ground, and the AoA indicates 75 deg. As 40 + 75 = 115 > 90 deg., this would imply negative airspeed. With a big enough tail wind, negative airspeed is possible... Also, AoA is the relative angle of air flow over the wing, and independent of nose attitude. An inverse micro-burst (air coming straight up from the ground, rather than down from above) could register a high AoA even with the nose pointing down. -- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com