737, the problem is that that 2,5% or whatever is required has to be maintained till MSA or MA level off altitude/level whichever comes first due to the fact that the level off segment has been deleted from the latest PANS OPS version. That puts a limitation on TOGA thrust usage even if the climb gradient is satisfied. So both criterion must be achieved GA climb gradient and duration of TOGA usage to be able to reach the necessary alt/lvl accelerate, clean up and ONLY then reduce thrust. That's where the performance dep. comes in and determines this threshold temp until which following the published GA is OK above which SE dep. must be followed. that's all at or above the mins below the mins (balked landing) the only choice left is to follow SE dep.
