More flap will help you get the same weight at a lower speed and there will likely be no problem.
But, the authorities want you to be able to still climb out and meet a certain climb gradient if you lose an engine at the most critical moment(V1) under the most critical situations.
The 737-200 is not exactly overpowered. Especially ones with the lower thrust engines. So the only way you can meet that required climb gradient in the unlikely event of an engine failure at the worst possible moment where you are continuing on is to use less flap. Which means that you need a higher rotation speed which means that you need a longer runway.
But if you were to break the rules, and knew what you were doing, the plane is capable of the higher flap settings and lower V speeds. In Africa perhaps?
We didn't even have takeoff info with us for flaps 15 and 25. And Flaps 10 was rare as well.
Last edited by JammedStab; 31st August 2012 at 06:45.