A few extracts from the wiki site. Source https://en.wikipedia.org/wiki/Boeing_737_MAX_groundings https://en.wikipedia.org/wiki/Boeing_737_MAX_groundings ..The

A few extracts from the wiki site. Source https://en.wikipedia.org/wiki/Boeing_737_MAX_groundings https://en.wikipedia.org/wiki/Boeing_737_MAX_groundings ..The 737 MAX's larger CFM LEAP-1B engines are fitted farther forward and higher up than in previous models. The aerodynamic effect of its nacelles contributes to the aircraft's tendency to pitch up at high angles of attack (AOA). The MCAS is intended to compensate in such cases.. ..MCAS was supposed to compensate for an excessive nose up angle by adjusting horizontal stabilizer before the aircraft would potentially stall.. ..MCAS played a role in both accidents, when it acted on false data from a single angle of attack (AoA) sensor.. ..elected to not describe it in the flight manual or in training materials, based on the fundamental design philosophy of retaining commonality with the 737NG.. ..thus minimizing the need for significant pilot retraining.. ..Thus, airlines can save money by employing and training one pool of pilots to fly both variants of the Boeing 737 interchangeably.. ..As an automated corrective measure, the MCAS was given full authority to bring the aircraft nose down, and could not be overridden by pilot resistance against the control wheel as on previous versions of the 737.. - Fixing a problem (engine size/placement not analysed) with a more complex solution (MCAS). - Acting on only 1 sensor. - Not described in manuals. - Not able to override. Text-book red flags. Definitely greedy managers that pushed towards this. However the engineers involved must have a bad taste (at Boeing and FAA). Engineers should take an oath like doctors do "Hippocratic Oath". The relationsship between business and engineering must be strictly defined. Compromises has to be taken, even in safety critical systems, but when taken it can't be the same business that can assess it OK. Engineers must be able to say categorically no and have it recorded outside business, without fear of losing jobs.