370. martin savidge is back inside a flight simulator to walk us through some of the details. richard quest also joins us, spent time with malaysia airlines before this incident. martin, you've been taking a closer look at the maintenance information system known by the acronym acars. tell us more about it. >> yeah, this is one of those things that up until now the average flying public knew nothing about but of course any pilot at least on an aircraft like this would know. acars. think of it as an alternative way to communicate outside of the traditional radio systems. i can access it here if i look at this screen and pull it up. here i've got a simple menu. it's possible here to amover a mouse. a pilot could send a text message to the ground or the ground could send a text message to them. this is good when the aircraft is far out at sea and maybe radio communication can be spotty. another way to access the system, same acars, but this is a different backup unit, is to go in through this, what do i call this mitchell again?