Mutt: The landing distance demonstrated by the boeing testpilots (i dunno exactly how many shots they had at doing them) was multiplied by 1.92 as to compensate for our shortcomings in handling the aircraft compared to the testjocks.. The figures where all done by boeing but they are in my company just used as a rule of thumb.. We normally donīt operate to fields where landing distance is a factor as much as the takeoff performance but still.. Gives us a ballpark idea of what turnoffs we can use etc.