jim sciutto is joining us along with ntsb and former aircraft mechanic john goleo. know not showing our viewers any secret information. this is all information that somebody who is very interested in this can find out online and elsewhere. i just don't want to give people the idea we're showing something we should not be showing. jim, this compartment where the computer maintenance system is known as acars, walk us through this, show us what it looks like. every plane is different, but how would someone go about disabling the system? >> reporter: i like you thought it was much more difficult to get here and that once you're here it would be much more difficult to disable systems. but it's really not. first here's how you get here this. little ladder here comes down from the cockpit so you'd open that trap door, walk down the stairs and then you're in the avionics bay here. and here on the right side, circuit breaker board looks kind of like the circuit breakers you'd have at home. simply pulling out one of those black knobs disables the system. all the systems are l