Originally Posted by
Pace
The cause of this crash was the inability of the Captain to enter the flight deck and to recover a situation caused by a very mentally sick FO its as simple as that!!
Disagree. Remember crash of EgytpAir flight 990? Cockpit door was unlocked, suicidal co-pilot started tragic dive and when captain get back to the flight deck wasn't able to stop his actions. Door is not the key. It was just a factor. The real cause was (most probably) deliberate action from FO. Planned and cold blood (should say steady breath) executed.
And mental condition is a separate case. I really doubt he could be as sick as some delusional, psychotic person who see things and hear things. These types of diseases are very easy recognizable, visible to environment.
More likely he was an
APD. And depression fueled by personal and professional problems was a trigger.