Archives For HOT theory

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 use of median value voting algorithms as part of fault tolerant design has become an almost ubiquitous design solution, especially for avionics systems. But have we really considered their suitability?

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If the theory of Highly Optimised Tolerance (HOT) theory holds true then we should be able to see a change in the distribution of the severity of adverse events as the design paradigm for a family of systems moves from the, ‘just make it work’ stage to the ‘optimise for robustness’ stage. This is something we can actually test through observation of real world systems.

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