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Crew, and the plane. that's what i do as a pilot. >> reporter: is that why this incident has so disturbed the people in your profession? >> it's unthinkable that a pilot would take an airplane and drive it into the ground. it's not something we would ever think about. >> reporter: kyung lah, cnn, las vegas. >> joining me again, cnn aviation correspondent richard quest and with us, ron stock and airbus a320 captain. ron, it's interesting to see that pilot in the simulator couldn't even bring himself that close to simulate crashing an aircraft. just against every instinct pilots have. >> even in...

Simulator in a scenario we've asked him to do for the purposes of this story, this pilot cannot stand it. does it exceed pilot instinct? is it human instinct to pull up the stick at that point? >> yes, i'm thinking about the safety of my passengers my crew and the plane. that's what i do as a pilot. >> reporter: is that why this incident has so disturbed the people in your profession? >> it's unthinkable that a pilot would take an airplane and drive it into the ground. it's not something we would ever think about. >> reporter: kyung lah, cnn, las vegas. >> joining me again, cnn aviation corres...

Don't supply this document you can be imprisoned for up to i believe, it's five years and fined $250,000. you have to report if you go visit a doctor for any reason on that form. >> i didn't realize that. that's incredible. ron stok thank you very much. richard quest as well. just ahead, the deliberate crash of 9525 reignited the debate over cameras in cockpits. why aren't they required and what difference might they make to safety even if they don't stop the crash, they wouldn't have been able to stop the crash on 9525 but would they make a difference for the investigation afterwards? details...

This is a simulator, we don't allow that to happen. >> richard, you and i were watching that. you had the same situation in simulators. >> the instructor will not even countenance the idea. they don't even want to think about it. don't want to try it. not only that, there have been times in the simulator i got into trouble and the instructor won't just switch it back. he'll take the controls, and they'll fly it out. it's a mental blockage. they dare not go to the idea that this isn't real. >> ron, it's interesting. is it possible once the flight data recorder is found, i mean, if this co-pilot...

It's a mental blockage. they dare not go to the idea that this isn't real. >> ron, it's interesting. is it possible once the flight data recorder is found, i mean if this co-pilot in the last seconds attempted to pull the plane back to pull the plane up would that record in the flight data recorder? >> absolutely. that should record control surface, control input. control surface movement. numerous parameters. yes, i would say that that would be, that data would be there. >> and, you know, again, there's a lot we don't know about this co-pilot exactly what the illness he was facing is that he ...