Well thats what airbus call it!
I am looking for a secondary reference to calculate the operational margin envelope reduction required for a mass and balance sheet to allow for innacuracies in aircraft weight, load, pax and fluids other than the one in the Airbus "getting to grips with weight and balance" cos I followed that and according to my calculations the aircraft shouldnt be flying
I'm sure I done something wrong but I have rechecked everything and still no joy.
Anyone got any good books or websites to peruse????
cheers
Nobby