Re: Ada / Boeing 777

[Sam Harbaugh <harbaugh@ACUSYS.COM>]

Ken Garlington <garlingtonke@LFWC.LOCKHEED.COM> 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.
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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.
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[or until impact with the earth :-) ]
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Ken Garlington <garlingtonke@LFWC.LOCKHEED.COM> 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.
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sam harbaugh  harbaugh@acusys.com