[SystemSafety] A Gem from Bloomberg

Peter Bernard Ladkin ladkin at causalis.com
Sat Nov 9 08:21:30 CET 2019

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 billion."

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 journalists?


Prof. Peter Bernard Ladkin, Bielefeld, Germany
Je suis Charlie
Tel+msg +49 (0)521 880 7319  www.rvs-bi.de

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