If you know what's going on, MCAS is quite safe No, it's not, and most of the regulatory agencies around the world agree. Pilots that Boeing handpicked to te

If you know what's going on, MCAS is quite safe No, it's not, and most of the regulatory agencies around the world agree. Pilots that Boeing handpicked to test out MCAS fixes (and thus knew what it was, what to do, and expected a problem) agree. And that whole runaway stab trim checklist is a red herring especially after Boeing has come out and said MCAS is a part of STS — itself a system that trims the stabilizer in a counterintuitive manner on the NG. The stabilizer operates in a counterintuitive manner on the NG and MCAS runaway doesn't meet Boeing's definition of runaway trim. Full. Stop. https://www.nytimes.com/2019/03/25/business/boeing-simulation-error.html https://www.nytimes.com/2019/03/25/business/boeing-simulatio... Here's a relevant quote: Those involved in the testing hadn’t fully understood just how powerful the system was until they flew the plane on a 737 Max simulator, according to the two people.