When was the flaps 2 setting needed....
Depending on our weight we used it on the 300/400/500 when ATC asked for 180Kts on the approach. We flew a fixed speed schedule in those days.
Never used it for take-off on either the classic or the -NG. And we never use it on the approach on the -NG.
why doesnt boeing change that flapsetting? Cut it out? certification?
I suspect that you have answered your own question
