> You seem very convinced that MCAS is some trivial system when it is very clear physically and legally speaking that that +/- 2.5 degree stabilizer movement at

> You seem very convinced that MCAS is some trivial system when it is very clear physically and legally speaking that that +/- 2.5 degree stabilizer movement at the right time is what the air-worthiness certification is dependent on. If that is your definition of non-triviality then the ash tray in the toilet is also a non-trivial system since the certification is dependent upon it being there. MCAS is only there to compensate for one part of the flight envelope where normal operations shouldn't be taking place. Point being, without that system the aircraft would still fly. In fact Lion air wouldn't have happened without it. Of course there could be a fault (beyond the nonsense of it not being triple redundant). Or it could be something unrelated to MCAS which is my own pet theory (partly based on the reports of pitch excursions with the autopilot engaged where MCAS is irrelevant).