Black boxes: crucial to air crash probes

When investigators arrive at an aviation crash site, one of their first priorities is to locate the plane's black boxes, two pieces of equipment that can hold vital clues on what caused an aircraft to go down. On Wednesday, Indonesian authorities were confident that sonar technology had pinpointed the location of the downed Lion Air jet, after two days of searching for the wreckage and its crucial data. Despite the name, the two boxes -- consisting of the flight data recorder and the cockpit voice recorder -- are in fact bright orange with reflective stripes, and all commercial planes are obliged to have them on board.

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