G'day mutt,
Could you please clarify.
Do the runway requirements you quote for a max Assumed Temp (49.3C) take off represent the actual lengths required if operating at an ACTUAL temperature of 49.3C at the given weight and conditions.
The reason I ask is that at an ACTUAL temperature of 15C there would be a considerable excess of performance versus the same take off at an ACTUAL 49.3c.
In other words we are "pretending" that it is 49.3C when it is actually 15C.