communication radio, control heads, and transponder on that center panel right below throttles, if there was an electrical fire or problem in that area, we would lose that information from the airplane. doesn't mean they manually shut the switches off. it means what we know for sure the time line and time things quit talking to everybody. we'll never know for sure what happened. >> at this point, you believe it's just as likely there was a mass event on this plane that had nothing to do with human intervention? >> absolutely. i don't see anything here that tells me -- i'm a security guy by training. i've been doing this 25 years. i typically say this has got to be a terrorist event. everything here i'm seeing is typical of other electrical fire problems. the sequence of events we're seeing we've seen happen before