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=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1014db,df854b5838c3e14 X-Google-Attributes: gid1014db,public X-Google-Thread: 103376,df854b5838c3e14 X-Google-Attributes: gid103376,public X-Google-Thread: 109fba,df854b5838c3e14 X-Google-Attributes: gid109fba,public From: mab@dst17.wdl.loral.com (Mark A Biggar) Subject: Re: C/C++ knocks the crap out of Ada Date: 1996/02/21 Message-ID: <4gfmat$rrm@wdl1.wdl.loral.com>#1/1 X-Deja-AN: 140545816 references: <312992F6.588D@lfwc.lockheed.com> <4gd3ui$6fi@moon.src.honeywell.com> organization: Loral Western Development Labs newsgroups: comp.lang.ada,comp.lang.c,comp.lang.c++ Date: 1996-02-21T00:00:00+00:00 List-Id: In article <4gd3ui$6fi@moon.src.honeywell.com> graba@htc.honeywell.com (Lee Graba) writes: >In article <312992F6.588D@lfwc.lockheed.com>, > Ken Garlington writes: >>Jon S Anthony wrote: >> 1. Until relatively recently, the F-16 flight control computer didn't have any >> software in it. It was an analog computer. > >Actually, the F-16A had a hybrid flight control computer. The primary flight >control functions were performed by an analog computer, but some flight control >gains were scheduled with respect to flight condition by a digital computer and >fed to the analog computer. However, setting gains should not cause the above- >described phenomenon. > >If such a thing did occur, it would probably be due to the Navset, which is >usually a separate digital computer whose responsibility is to take >measurements and then compute positions and attitudes, and associated rates. >A software error here might cause a problem, if say, it was telling the flight >control computer that it was flying straight and level, and suddenly told it >that it was really upside down. The flight control computer would then try >to right the plane, since it doesn't know good information from bad. > >I have heard the above story, as well, but don't know if it is true. I believe that this is listed in the Risks list that appears the ACM SIGSEM. The way I heard it, was that this never happen in an actual plane but was a bug in a early version of the autopilot simulation system. -- Mark Biggar mab@wdl.loral.com