On Nov. 18, the FAA approved Boeing's request to resume Boeing 737 Max (737-8 and 737-9) operations. 13, 2019, "Think Again" Control Engineering commentary that noted: "Best practices matter when designing control systems." Addressing design changes, Boeing said in an Oct. 25, 2019, statement: "Boeing has redesigned the way Angle of Attack (AoA) sensors work with a feature of the flight control software known as Maneuvering Characteristics Augmentation System (MCAS). Going forward, MCAS will compare information from both AoA sensors before activating, adding a new layer of protection. In addition, MCAS will now only turn on if both AoA sensors agree, will only activate once in response to erroneous AOA, and will always be subject to a maximum limit that can be overridden with the control column. These software changes will prevent the flight control conditions that occurred in this accident from ever happening again. In addition, Boeing is updating crew manuals and pilot training, designed to ensure every pilot has all of the information they need to fly the 737 MAX safely."
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