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Still missing are the plane's flight data and voice recorders, thought to be deep under water. French-chartered ships are trolling a search area with a radius of 50 miles (80 kilometers), pulling U.S. Navy underwater listening devices attached to 19,700 feet (6,000 meters) of cable. The black boxes send out an electronic tapping sound that can be heard up to 1.25 miles (2 kilometers) away. Brazilian and American officials said that as of Sunday evening no signals from the black boxes had been picked up. Without the black boxes to help explain what went wrong, the investigation has focused on a flurry of automated messages sent by the plane minutes before it lost contact. One of the messages suggests external speed sensors had iced over, destabilizing the plane's control systems.
[Associated
Press;
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