Originally Posted by
Steve M
I don't know why using the cockpit window as an exit would not work in such a situation, but somebody felt it was important enough to add the exit hatch to the roof.
The roof hatch has another useful purpose. When the German Soccer team arrived back in Frankfurt from World Soccer Championship Japan/Korea someone of the crew opened the hatch climbed half through it and and hold a German Flag in his hand. I know this isn't the reason they put this hatch in.