BahrainLad,
Search the internet. If you know where to look you will find the info on the 747 being originally designed as a double decker.
To the rest,
It's not the function of the slide I am talking about. I am sure on they will function fine. It is the human component here that I think will be the failure point. Next time you are in a 4 story building look out the window and think to yourself....in the pitch black would I jump on a slide without hesitation from up here? Maybe you would, but the chances of at least one person freezing and blowing the test out of 200 is very high. I am not beating on Airbus's ability to design a safe airplane. It's the logic that went behind it.
