Persistent Boeing Puzzle: Why Some Security Functions on 737 MAX Jets Have Been Disabled



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The aircraft builder Boeing Co. did not tell Southwest Airlines Co., when the carrier had started flying 737 MAX jets in 2017, that a standard safety feature, found on previous models and designed to warn pilots of sensor malfunction, had been disabled.

The Federal Aviation Administration's safety inspectors and supervisors responsible for overseeing Southwest, MAX's biggest customer, also were unaware of the change, according to government officials and the industry. .

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