I am trying to determine whether the general policy used is broadly similar for various aircraft types (irrespective of size and engine type)
In particular, what determines the level of climb derate that can be used?
Is derate used provided TOW is low enough to hit a minumum time/distance to height target with the derate level selected?
I am then aware that the departures from some airports make it advantageous to get as high as possible as quick as possible. For which airports is this as issue?