The 5.5-Degree Rule That Now Governs Every 737 MAX Takeoff After Boeing's MCAS Rewrite

Most people will remember the two fatal crashes involving Boeing 737 MAX aircraft: Lion Air flight 610 in 2018 and Ethiopian Airlines flight 302 in 2019. These accidents exposed a flight-control system that, at the time, was largely unknown outside Boeing’s engineering community: the Maneuvering Characteristics Augmentation System, or MCAS. The US planemaker introduced MCAS on the 737 MAX after identifying changes in the aircraft’s pitch characteristics associated with its larger engines and their position on the airframe.

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