Copyright 2019 NPR. To see more, visit AILSA CHANG, HOST: There's more bad news for Boeing. The company is back on the defensive after admitting over the weekend that a safety sensor on its troubled 737 Max planes didn't work as intended. And anger is intensifying because Boeing didn't tell airlines about that until after the first of its planes crashed last October. All of that is ratcheting up pressure on Boeing as it tries to get its grounded 737 Max planes back in the air. We're joined now by NPR's Russell Lewis, who's been following this part of the story. Hey, Russell. RUSSELL LEWIS, BYLINE: Hi there. CHANG: So what do we know about this sensor and why it didn't work properly? LEWIS: Well, this is called the angle of attack disagree alert. This plane has two angle of attack sensors, one on each side of the nose. And they're designed to tell the flight crew how the plane is flying relative to airflow over the wing. If the angle of attack gets too high, the plane's wing can stop
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