Boeing Waited Until After Lion Air Crash to Tell Southwest Safety Alert was Turned Off on 737 Max
Boeing did not tell Southwest Airlines, its largest 737 Max customer, that a standard safety feature designed to warn pilots about malfunctioning sensors had been deactivated on the jets.
The safety feature is an alert that lights up in the cockpit if a plane’s angle-of-attack sensors transmit faulty data about the pitch of the plane’s nose. This feature is known as an angle-of-attack disagree light and was included in previous versions of the 737.