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Ethiopian Airlines crash: What is the MCAS system on the Boeing 737 Max 8?
https://phys.org/news/2019-03-ethiopian-airlines-mcas-boeing-max_1.html
Both the Lion Air jet, which crashed in October, killing 189 people, and the Ethiopian Airlines aircraft, which went down a week ago Sunday, leaving 157 people dead, were fitted with the system.
Both planes experienced similarly erratic steep climbs and descents and fluctuating airspeeds before crashing shortly after takeoff.