Originally Posted by bellfest
That's quite interesting how they have done that. Am I missing something here?
10'000' ISA is -5 +25=+20 degrees.
12'500'ISA is -10 +30=+20 degrees.
Both have an OAT of +20 yet one is 15min and the other is 10min
I am quite prepared for someone to point out something obvious I have overlooked

Come on Dave...since you brought it up!