WASHINGTON—Details of Boeing’s plans to upgrade the 737 MAX’s flight control system are increasing the glare on flight-deck human factors breakdowns in the model’s design. The bulk of Boeing’s changes target the MAX’s maneuvering characteristics augmentation system (MCAS), which helps the aircraft perform more like its 737NG predecessor in certain flight scenarios. MCAS’s purpose is to force the MAX’s nose down by moving the horizontal ...

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