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Boeing Failed to Disclose Faulty Cockpit Alert for Months Before Lion Air Crash

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Boeing was aware of a faulty system that inactivated a cockpit alert function in its 737 Max jets for months before the deadly Lion Air crash but failed to disclose the issue to airlines and regulators until after the accident, according to a statement the company put out Sunday.

The aerospace manufacturer maintains that the issue “did not adversely impact airplane safety or operation.” While it’s not known if the lack of a functioning alert light—known as the “angle of attack disagree alert”—played a role in the Lion Air and later Ethiopian Airlines crashes that killed a combined 346 people, the statement raises further questions about how transparent the company has been in dealing with the 737 Max jets.

Preliminary investigations for both accidents suggest faulty data from a malfunctioning angle of attack, or AOA, sensor, sent the signal to the plane’s anti-stall software that the plane was pointed at a dangerously high angle, putting it at risk of stalling. The software, known as MCAS, reacted by pitching the........

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