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High-tech passenger jets used around the world. >> normal, lock, and unlock. >> reporter: he like all pilots has used the switch hundreds of times. >> the unlock you have to pull up and hold it. a light comes on, says the door's open. but if i release it it goes back to normal position. >> reporter: norm means that it's locked. >> norm is locked. that's correct. >> reporter: according to an airbus operations video, there's a keypad entry on the outside that allows entry if you know the code. but if the person inside the cockpit switches it to lock, the keypad won't work for five minutes. and t...

Times. >> unlock you have to pull up and hold it. lock comes on, says the door's open. but if i release it it goes back to normal position. >> reporter: norm means that it's locked. >> norm is locked. that's correct. >> reporter: according to an airbus operations video, there's a keypad entry on the outside that allows entry if you know the code. but if the person inside the cockpit switches it to lock, the keypad won't work for five minutes. and there's another override that goes beyond five minutes. >> i can also override the keypad and hold it in the locked position, and now he cannot use t...

There's another override that goes beyond five minutes. >> i can override the key pad and hold in the locked position. he cannot use the key pad or get in. >> to keep your co-pilot out, what do you have to do? >> if he knew the keyboard pad to get in i hold the lock. he cannot get in. >> can you manually fly this and hold the lock button? >> yes, easy. >> that's a purposeful act? >> very much so. >> again and again we fly through the scenarios in auto pilot and manuel. both managed to crash the plane. both had to be deliberately programmed or flown into the ground. what does that suggest to yo...

Door is open. if i release it it goes back to normal position. >> norm means it's locked. >> norm is locked. >> reporter: according an airbus operations video there's a key pad entry on the outside that allows entry if you know the code. if the person inside the cockpit switches it to lock, the key pad won't work for five minutes. there's another override that goes beyond five minutes. >> i can also override the key pad and hold it in the lock position and now he cannot use the key pad or enter the door at all. it's locked. >> no one can get in? >> no one can get in. >> to keep your co high lo...

Either do nothing, in which case the door will open in 30 seconds, if they were unconscious or incapacitated, but they also have the ability to push that button to lock. if during the override procedure they push the button to lock, then nobody can get in for five minutes. effectively the override stops and you can't enter. what we heard today from the ceo of lufthansa, and it is significant, john, he said he doesn't know, firstly, if the override procedure was attempted by the captain on the outside or did he just bang on the door. and secondly, we don't know whether or not lubitz inside actu...