The sensor, a vane located on the front of the Boeing 737 Max model known as the angle-of-attack sensor, fed incorrect data to the flight control system of the Lion Air plane, activating an anti-stall software on the aircraft that repeatedly pitched the plane downward before its crash into the Java Sea, killing 189 people, Indonesian authorities have said.
The manufacturer of the AoA sensor used on Boeing's 737 Max model, Rosemount Aerospace, was also visited by NTSB investigators after the Lion Air crash, according to a former engineer at the company who requested anonymity because he was not authorized to speak for the company. A spokeswoman for United Technologies, which owns the Burnsville, Minnesota-based Rosemount, declined to comment.
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