WASHINGTON—New questions are being raised over the development and oversight of the Boeing 737 MAX after revelations the manufacturer knew about a mis-configured angle of attack disagree annunciator alert message on the aircraft in 2017 but did not fix it or tell operators about the problem until after last October’s crash of a 737 MAX 8—the first of two to strike the model in five months. Boeing on May 5 clarified that within “several months” after MAX ...


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