CNN CNN Newsroom January 3, 2015 17:18:00
Piece of information. data about the air speed, altitude pitch, acceleration roll fuel. and the list goes on and on. but to make sense of the data first you have to find it. not an easy thing to do when a plane crashes into the ocean. both black box components are outfitted with underwater beacons. which self-activate the moment they come into water. they send pings to transmit information. and to transmit data as low as 20,000 feet. when the batteries run out but on land there's no such ping for the search. investigators have to sift through the wreckage until they find it. >> rachel crane, t...