Back in Seattle, he joined a half dozen fellow Boeing trainers for a briefing about how the MCAS software worked from Patrik Gustavsson, the former Ryanair pilot who had traded frustrated messages with Forkner two years earlier. Gustavsson was now the chief 737 technical pilot. When Gustavsson told them the software fired based on a single angle-of-attack vane and that it would continue firing even after a bad reading, “we were universally shocked,” this person said. The group consisted of trainers who’d been left “out of the loop,” as Gustavsson himself had put it. They instantly recognized
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