This is a rare absolute must-read. The 737-MAX needs to be grounded now. This is a more serious failure than I thought. https://theaircurrent.com/aviation-safety/the-world-pulls-the-andon-cord-on-the-737-max/ … ht @benthompson
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I think the plane needs to be grounded, the "MCAS" turned off (at least the part that's there purely to emulate the handling of the old 737) and pilots recertified on the "native" handling characteristics of what is essentially a new plane in physics terms.
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The Lion Air case at least is a classic Perrow-style "normal accident" (interaction of two expected error cases leading to an unexpected error case: the AOA sensor error and Lion air not buying the "optional" warning package).
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I'm betting the Ethiopian Air case will turn out to be the same or at least similar. The details are too suspiciously similar for it to be otherwise.
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Caveat: I'm taking the analysis in the OP at face value because it seems reasonable. Opinion may change once more details emerge on both cases.
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I've been thinking about this stuff since the Air France case. In general, there are 2 architectural approaches to design human-in-the-loop control systems. The good one follows the contours of the physics. The bad one tries to treat it like a computer UI :(
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If you're going to synthesize a UI divorced from the physics in any way, the autopilot must be truly fully autonomous so the pilot is not needed at all. if the pilot is needed for top-level exception handling, the UI must conform to the physics, not pilot convenience.
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Totally Agree Aircraft is inherently unsafe, and trying to compensate via computer driven "control surfaces" rather than change wing design reeks of poor testing upfront Having the AOA Warning as "optional" must class a negligence
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It’s not clear the aircraft is physically unsafe. The control emulation strategy seems bad. You can’t second guess at “change wing design” level without knowing a lot more. Raising the nose landing gear to accommodate a larger engine seems a reasonable physical design choice.
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