Originally Posted by
LTNman
So where is the evidence? Looking up the manufacturers spec for the ATR72, it stated that at maximum takeoff weight the aircraft needs only 1315m. Why did those figures not apply at SOU?
1315m is at ISA conditions - which assumes no wind 15°C, 1013mbar ambient pressure etc... Aircraft performance can drop off considerably when these values deviate. Those distances also don't factor in the effect of any obstacles around the runway.