thank you John for your comments and insight,
I have corrected the erronous unit on for running load...
my bad..
Is anyone familiar with a good solid refrence for this.. ie in an IASA loading manual or in any icao or aircraft manufacture documentation in order for me to demonstrate that my calculation is correct ie 667 kg/m2 .
appreciate all contributions , keep it coming if you think you have further that can add to the discussion..