Key changes to the Boeing 737 MAX’s maneuvering characteristics augmentation system (MCAS) will incorporate more redundancy into the aircraft’s much-scrutinized flight-control law and give pilots ultimate elevator authority by limiting the degree of nose-down stabilizer command the automated system can trigger. The update improves the logic that triggers MCAS, boosts system robustness by feeding it with simultaneous data from two angle-of-attack (AOA) sensors, and places tighter ...

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