CNN The Situation Room December 29, 2014 22:51:00
Not only does it record all the vital information that the flight recorder normally gathers, it can intercept that information, and track it and start transmitting. these signal also go to the satellite, override all other traffic. theyll get a priority thats the protocol. so between the time that something happens to a plane, as in this case for example, and when it hits the water, if thats what it ends up doing, it will already have a lot of data and tell you what went wrong in that plane. you...
Source: archive.org