Archives For voting logic

QF 72 (Image Source: Terence Ong)

The QF 72 accident illustrates the significant effects that ‘small field’ decisions can have on overall system safety Continue Reading…

So far as we know flight AF 447 fell out of the sky with its systems performing as their designers had specified, if not how they expected, right up-to the point that it impacted the surface of the ocean.

So how is it possible that incorrect air data could simultaneously cause upsets in aircraft functions as disparate as engine thrust management, flight law protection and traffic avoidance?

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The statement by, AirBus regarding the robustness of the AirBus AOA voting logic disclosed in the ATSB QF72 accident report raises some interesting questions as to what was actually meant by the term robustness.

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The QF 72 in flight pitch upset demonstrates the vulnerability of a redundant and presumed fault tolerant systems to situations where the real world does not accord with the assumptions made by designers.

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