Originally Posted by
double_barrel
But having made that error, how can they have got it into the air? Presumably the take off run was calculated for 3 times the distance that was actually available. I am sure I have read on here that you chaps don't thrash the thing unnecessarily but derate appropriately. So they realized early on, did some rapid mental arithmetic and decided to floor it ?!
Sure, but when deration happens it doesn't always mean you will use the full runway. Also, there are a lot of safety margins. Probably they just got lucky and cleared it just in time.