Boeing on March 19 published an open letter from CEO Dennis Muilenburg to "airlines, passengers, and the aviation community" to reiterate the company's "core" priority of safety amid reports of government investigations into the Federal Aviation Administration's oversight and certification of the company's 737 Max program. In the letter, Muilenburg alluded to the company's work on a software upgrade designed to mitigate the possibility of an uncommanded dive originating from false readings from one of the airplane's angle-of-attack sensors. Officials continue to investigate the possibility that a false reading from an AOA sensor prompted the model's maneuvering characteristics augmentation system (MCAS) to force the nose of the Max down into a steep descent from which the pilots commanding the airplanes involved in two fatal crashes in five months failed to recover.
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