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Simulator as a back drop, is now the center of the investigation. the chairman of the house homeland security committee who gets regular updates says an fbi team was on the ground after the investigation was formally declared a criminal case. >> there is a little bit of a national pride on the part of malaysia. but i would really hope they let our experts in that would do this stuff. to get to the bottom of this stuff this is too much of a mystery at this point. >> the malaysian authorities are nailing down the time line at 1:07 a.m. the jet's maintenance system sent out a regular update. at w...

Will, based on the acar system, the maintenance system, going dark, and then the transponder going dark as well, eric. >> hey, katherine, it's andrea tantaros. who played the message that they received, that the data was changed through acars? do we know it came from a dispatcher, where did we get the information everybody is talking about today? >> the acar system for a layperson, this is a maintenance system onboard most of the boeing flights. it offered an upgraded system, but the basic system pulses out kind of an overall picture on the health of the aircraft about every half an hour. in t...

Airspace, bill. bill: what about the pilot and copilot? seems to be, they are zeroed in on these two gentlemen. >> reporter: that's correct. with new searches of the pilot and copilot's homes the scrutiny is intensifying on the 53-year-old pilot's political views. it is widely reported that is a larry shah was ties to opposition leader. and on the day of the flight this opposition leader was sentenced to five years in prison, suggesting that the trial of the pilot dejected with a motive to sabotage flight 370 though the pilot's friends deny he is terrorist with any political motive. bill: wher...

This aircraft. >> there is a thing called acars. the airline's service data system. >> that's correct. >> did i get that right? >> yeah. it's a maintenance system that goes to a satellite and then to the ground that provides information about the mechanical health of the aircraft. it was that system that was very helpful in identifying the location of the air france accident. so i understand that information has come to light that may indicate that there's a possibility and this is pure speculation at this point, that this may be similar to the payne stewart flight, that there was some decompr...

Taking them directly into soviet air space. looking at the erratic flight path of malaysia flight 370, that scenario seems unlikely. but we may never know for sure. randi kaye, cnn. >> it also makes us take a very long time before we do know. joining me now avenuiation expert john hansman professor of aeronautics and astronaut ics at myth. what did aviation experts learn from that disaster, that incident that could be applied to this search? >> it was a little bit of a different situation because we actually had a record -- there was actually signals that were coming off the airplane from the ...