Originally Posted by Rainboe
As far as I am aware, there are no rules- it is as far as the designer wants. I think you will find that with all widebodies with some sort of lower deck accommodation of any sort, it must be unoccupied for take off and landing,
Well, see the comments on the PSA picture:
http://www.!!!!!!!!!!!!!!/open.file/0939205/L/
I have seen the story elsewhere, but cannot find it again, so I believe it is not a mere rumour and that those Tristars could have lower deck occupied on landings and takeoffs.
So, just what was so difficult about making the Tristar underbelly, or any other widebody underbelly, safe to occupy on takeoff/landing?