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 lot out, what do you do? >> i just hold the lock. he cannot get in. >> can you manually fly this and hold the lock button? >> easy. >> that's a very purposeful act? >> very much so. >> pull up. >> again and again we through