[SystemSafety] A Gem from Bloomberg

paul_e.bennett at topmail.co.uk paul_e.bennett at topmail.co.uk
Sat Nov 9 08:32:00 CET 2019

On 09/11/2019 at 7:22 AM, "Peter Bernard Ladkin" <ladkin at causalis.com> wrote:
>An article on the Boeing 737 MAX SW revision:
>which includes this gem: "Manufacturers may have to demonstrate 
>with extensive testing that a
>software failure leading to a crash would be as rare as one in a 
>If that is so, then, to any reasonable degree of confidence, we 
>have a mathematical proof that the
>aircraft will never return to service.
>How is it that, 26 years after it was pointed out clearly in two 
>articles in the
>software-engineering literature, and 22 years after Table D.1 in 
>Annex D of Part 7 of the
>international standard for functional safety of E/E/PE systems was 
>published, which includes the
>necessary figures, engineers can suggest such nonsense to 

I thought we had also established that software can never
compensate for poor design of the overall system. Using software
as a plaster for poor aircraft system design decisions and relying
on only one channel of information to do so was always going to
lead to a disaster at some point.


Paul E. Bennett IEng MIET
Systems Engineer
Lunar Mission One Ambassador
Paul E. Bennett IEng MIET.....
Forth based HIDECS Consultancy.............
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