Boeing says it didn’t “intentionally or otherwise deactivate” the disagree alert on its 737 Max jets. This comes in response to reports that they failed to tell Southwest Airlines and the FAA that the safety feature was deactivated before recent crashes.
Southwest said that it did not know about the deactivation of the disagree alert, which warns pilots about malfunctioning sensors, until after the crash of a Lion Air flight in Indonesia, and said that Boeing indicated in its manual that the disagree lights were functional.
The feature is an alert that lights up in the cockpit if a plane’s angle-of-attack sensors transmit incorrect data about the pitch of the plane’s nose. The angle of attack indicator displays the readings of the two sensors, and the disagree light is then activated if those sensors are misaligned with one another.
Boeing is working on an update to the jet’s anti-stall software, known as MCAS, and plans to make the disagree light standard on all new 737 Max jets. The situation has been an overhang on Boeing’s business, and has weighed on its stock. At Boeing’s shareholder meeting on Monday, its chairman and CEO, Dennis Muilenburg, rejected criticism about how the company designed the Max flight control system, calling its development “thorough” and “disciplined.”
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