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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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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End of conversation
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But MCAS sounds critical, since the design seems to leave less room for error than the previous design. I don't think they can just turn it off. This may be 500+ planes to the scrap heap. Only a massive bailout will be able to save Boeing.
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I don't think you can just "turn off" a fly-by-wire system and expect an operable plane.
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