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Cnns kyung lah goes inside a flight simulator to get some answers. >> reporter: well fredricka, im inside an a-320 simulator. im with pilot buzz roger, taking us today. and were talking safety. lets first off talk about the two-person rule. can you explain that? >> sure the two-person rule kyung, is when someone leaves the cockpit. and before that person leaves another crew member comes in. so there is always two people inside this cockpit. and theres several good reasons for that. basically, sa...

That would be by doing it manually and what he would do is disconnect the autopilot, pushing in button and just gently pushing the stick down. nothing -- again, the passengers would not feel this. it would be a normal descent and the airplane he would just leave it. it trims itself. this is a very sophisticated airplane. thats an auto trend situation. it will protect itself from speed, and he would never have to touch another button. >> reporter: thank you buck rodger with us showing us how an a...

Plane crash on twitter. we have our experts here to answer them. lets bring in our panel. cnn aviation correspondent richard quest, safety an live lift david souci and captain and aviation analyst. also in los angeles, criminal defense attorney brian claypool. we begin with you, richard. this question from cynthia gaines writes in can a cockpit be reconfigured for the pilotss toilet thus allowing files remain in the cockpit throughout the flight? this is something that has come up. >> on an a 32...

Roger, a current commercial pilot. you have 20 years flying in commercial airlines. were actually in a simulator, correct? >> thats right. were in a-320 simulator, the same type of aircraft same cockpit that germanwings was using. >> and lets talk about the lock on the door and what this two-person rule, why its coming into play. >> with the reinforced cockpit door we have to have people come in and to go out. when somebody is on the outside of the door and wants to come in, they will enter in a...

Cockpit. it seems to be beyond the realms of mathematical possibility that those two actions could result. >> cnn aviation analyst les abend is back with me. not only cnn aviation analyst, he is a boeing 777 pilot. we have this picture of what it is like inside an a 320 cockpit. what that airline expert was responding to were some who said could he have fallen onto this switch that automatically locks the door that clearly locked the captain out? could that have happened? this expert says no. is...

Daunting task of combing through the french mountainside for clues to exactly what may have led the co-pilot to deliberately crash the plane. a significant piece to the puzzle whether passengers on board left any evidence that shows exactly what was going on as the plane went down. despite the fact that the plane is completely destroyed could investigators find any form of electronic data like e-mails, texts or cell phone video. lets get more on this from cnn technology correspondent samuel burk...

The airplane in all phases of flight approach. im not totally familiar with an airbus a 320. but theres aspects of the airplane that are very similar to others. and its part of the system. you cant take that away from a pilot. he knew that ability was there. he depended upon the mode that he utilized to get down to that 100 feet. he could have done it with vertical speed. he actually could have actually done it -- he could have been hand flying the airplane. we dont know for sure whether the aut...

Problems that may have jeopardized his ability to work as a pilot. the lead french prosecutor said lubitz locked the captain out of the flight deck then programmed a 320 jetliners descent slamming it into an alpine ridge at 400 miles an hour. captain chuck nash is a retired navy captain and a fox news military analyst. he joins us now. captain, good of you to join us to share some perspective on this tragic story. memorial service being held today so many people are mourning. but, look the main ...

Reinforced cockpit door and we want to give you a closeup look how it works. the 737 was mothballed less than a year ago. the locking system on these reinforced doors is similar to the locking system you would have in an airbus 320, the plane that crashed if france. this is the director of southern california aviation. what is this door made of? >> this is an inch and a half thick kevlar. >> this has a key override lock system, too. it has what the airbuses a, a numbering system. what is that fo...

But i wonder why there is not more alignment, even more alignment between u.s. and european or u.s. and globe regulations, should there be a more global approach to this? >> i think there should be one level of safety and we have one in the manufacture and certification of aircraft. they value to be certified and meet the standards. the french have a regulator as do other countries. we have incredibly safe aircraft like the a-320. we dont have that level of safe if i for some other procedures. w...