To repeat: one must use the approved loading system however, for the aeroplanes that many of us fly, the method of doing the arithmetic calculations is not specified. I can do them in my head, use my old engineering sliderule or whatever. OzRunways is one way to do the arithmetic. Any are ok to do the arithmetic.
megle2, perhaps you were using OzRunways instead of the approved loading system?
Sorry Wan, perhaps later when I have refined it.