Boeing knew there was a safety alert that wasn't working as it intended on its 737 Max planes, but the company didn't disclose that until after a fatal crash.
FILE - In this Wednesday, April 10, 2019 file photo, a Boeing 737 Max 8 airplane being built for India-based Jet Airways, takes off on a test flight at Boeing Field in Seattle. Boeing said Sunday, May 5, 2019, that it discovered after airlines had been flying its 737 Max plane for several months that a safety alert in the cockpit was not working as intended, yet it didn't disclose that fact to airlines or federal regulators until after one of the planes crashed.
But within months of the plane’s debut in 2017, Boeing said, its engineers realized that the sensor warning light only worked when airlines also bought a separate, optional feature. Boeing said again that the plane was safe to fly without the sensor alert, called an angle-of-attack disagree light. Other gauges tell pilots enough about the plane’s speed, altitude, engine performance and other factors to fly safely, the company said.
In manuals that Boeing gave to Southwest Airlines, the biggest operator of both the Max and 737s in general, the warning light was depicted as a standard feature just as it is on older 737s, according to Southwest spokeswoman Brandy King. The indicator was supposed to tell pilots when sensors that measure the pitch of the plane’s nose appear to conflict, a sign that the sensor information is unreliable. Boeing told airlines that the warning light was standard equipment on all Max jets.
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