Even as Boeing inches closer to getting the 737 Max back in the air, new problems are emerging that go beyond the software that played a role in two crashes.
As part of the work to return the Max to service, the company and regulators have uncovered new potential design flaws.
At the request of the Federal Aviation Administration (FAA), Boeing conducted an internal audit in December to determine whether it had accurately assessed the dangers of key systems given new assumptions about how long it might take pilots to respond to emergencies, according to a senior engineer at Boeing and three

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