Normal Lock News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Door screaming, for god's sake let me back in. here is kyung lah. >> reporter: the switch is surprisingly simple and exists in the cockpit of every single commercial plane that's flying around the world. he cannot imagine why a pilot would do this. but he knows how. a commercial retired pilot forsythe has flown thousands of hours. >> normal lock and unlock. >> reporter: he like all pilots has used the switch hundreds of time. >> to unlock you have to pull up and hold it and a light comes on saying that it's open. if i release it it goes back to normal position. >> reporter: norm means it is lo...

Prosecutors reprogrammed the plane's autopilot to crash. he changed the cruising altitude from 38,000 feet to just 100 feet. the cockpit voice recorder indicates the co-pilot locked the captain out. he then ignored screaming and pounding of the cockpit door putting the plane that steady descent and crashing it into a mountain. how was this pilot able to pull off this horrific act? >> reporter: he cannot imagine why a pilot would do this. bugs forscythe knows how. a retired military commercial pilot he says he's flown thousands of ours in the a320 cockpit. >> normal lock and unlock. >> reporter...