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You're not Boeing to believe this, but... Another deadly 737 Max control bug found

SkippyBing Silver badge

The Max is stable until it approaches the stall when the engine nacelles start to generate lift, reducing the stick force required to raise the nose.

For certification there's a requirement that it requires a given stick force to raise/lower the nose enough to change the speed by a set amount. The Max fails this without MCAS, designing it out would end up with a very different aircraft and require complete recertification. To minimise the training in the differences to keep a common type rating with earlier models, and make the costs attractive for airlines, they didn't mention MCAS in the conversion course.

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