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Even if the copilot enters the code outside the cockpit door it will not open. once that deliberate act of going to the locked position which is a hijacking situation. there is a time delay. i'm sure we'll learn more details about the particular mechanism that's been reported the door is armored. so the captain even though he was valently trying regain access according to the voice recorder information we just don't know. but i understand you cannot override that once the pilot in the cockpit hits the lock switch for a time of i think it's five minutes. bill: the ceo of the airlines says there...

Enter the cockpit in order to take over the controls of the airplane. and, the mechanism is, in fact, only inside of the cockpit. it's code, identification code. like a camera, where you will recognize and you have to press the button in order to open the door. >> reporter: but that code, the opening of the door from the outside, can be overridden by the pilot inside, with a second lock that he can close. we can safely assume lubitz did latch the second lock given increasingly desperate banging on the door as the plane descended. final noise on the voice recorder screams heard from the passeng...

Investigator out of albuquerque new mexico. he's been an excellent voice guiding us through day by day now day three of this tragedy. what appears for the moment to be murder. now it appears that copilot took that plain at an opportunity he chose to fly the plane into the ground. martha: a stunning revelation that started to come out yesterday evening and was confirmed by the french prosecutor who gave great detail about exactly what happened, how the pilot was locked out after he left to go to the bathroom. he tried to get in using the code. he banged on the door. according to the french pros...

If you actually ask your questions loud enough. >> jonathon niller from channel 4 news. you say there is no way of preventing an accident. was there no procedure by which the captain could have entered the cockpit door by entering a code to override the locking system? >> thank you for the question. in our industry since the events are very dreadful of the 11th of september, the access to cockpits was changed and maybe my colleagues can supplement my experience.. and my experience as a pilot.

On-off switch. it is not just position it's altitude and the traffic collision aborting system. there's three incredibly important functions. if you are halfway over the atlantic or the south china sea where there's no primary coverage. >> what you are saying if a transponder is turned off there's no way to specifically identify this plane or the altitude of this plane. >> absolutely spot on. you can see the four digits here that provide the aircraft with a unique identification code. >> when those four digits are not there? >> those four digits disappear from the radar screen as to the altitu...