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The Maneuvering Characteristics Augmentation System (MCAS) is a flight control law [34] built into the Boeing 737 MAX's flight control computer, designed to help the aircraft emulate the handling characteristics of the earlier Boeing 737 Next Generation. According to an international Civil Aviation Authorities team review (JATR) commissioned by ...
Top Boeing officials believed MCAS operated only far beyond the normal flight envelope, and was unlikely to activate in normal flight. [36] Boeing had also failed to answer questions raised by Canadian test pilots on behalf of Transport Canada about how the anti-stall system operated before the airplane was certified. [37]
Boeing, however, asserted that MCAS was not an anti-stall system, as the media widely reported it to be. Pilot movement of the control column on the MAX did not disable MCAS, unlike an earlier implementation of MCAS on the U.S. Air Force Boeing 767 Tanker.
Boeing did not tell airlines and pilots about the new software system, called MCAS, that could turn the plane’s nose down without input from pilots if a sensor detected that the plane might go ...
Boeing initially hesitated to identify MCAS as a contributor to the crash, but some details of the system’s performance emerged within days of the incident. By early November, ...
Boeing shareholders sued, waging similar claims. Once federal authorities confirmed that the MCAS system played a role in both crashes, the Justice Department filed criminal charges against Boeing ...
MCAS was deemed necessary by Boeing to meet its internal objective of minimizing training requirements for pilots already qualified on the 737NG. MCAS was to automatically mitigate the pitch-up tendency of the new flight geometry due to the engines being located farther forward and higher than on previous 737 models. [138]
The crashes of Lion Air and Ethiopian Airlines in 2018 and 2019, which killed a total of 346 people, both involved the failure of a Boeing software system known as MCAS.