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: 103376,d923bb34ea827f56 X-Google-Attributes: gid103376,public From: Sam Harbaugh Subject: Re: Ada / Boeing 777 Date: 1996/03/19 Message-ID: <199603200041.TAA12243@bb.iu.net>#1/1 X-Deja-AN: 143379328 sender: Ada programming language x-sender: harbaugh@iu.net comments: Gated by NETNEWS@AUVM.AMERICAN.EDU content-type: text/plain; charset="us-ascii" mime-version: 1.0 newsgroups: comp.lang.ada x-mailer: Windows Eudora Light Version 1.5.2 Date: 1996-03-19T00:00:00+00:00 List-Id: Ken Garlington wrote ron thompson wrote: > 777 is the first 100% fly by wire, no mechanical backups > of any kind, built in the US of A. Ken First _commercial_ aircraft that is 100% fly by wire, no Ken mechanical backups, built in the USA, of course. ------------------------------------ from the newspaper article: In the unlikely event of a complete electrical system shutdown, cables from the cockpit to selected spoilers and the horizontal tail section allow the pilot to glide straight and level until the electrical system is restarted. ---------------------------------- [or until impact with the earth :-) ] --------------------------------------- Ken Garlington wrote: Tim Rowe wrote: > > AIUI the Airbus range has triplicated *diverse* systems for critical > functions. The 777 has triplicated *identical* systems (I'm trusting the > press for this, so it may not be gospel). Ken If I recall the TRI-Ada stuff on this, it's the same source code, compiled Ken with three different compilers for three different targets. So, it Ken depends on what you mean by "diversity." I recall it being written that each of the three were programmed in a different language, Ada, C and PL/M. ------------------------------------------------------ sam harbaugh harbaugh@acusys.com