Still trying to absorb all this excellent information... It's the "lapse" rate I'm still trying to get my head around. "Lapse" I usually associate with "fall behind" not keep up with.
Does an engine's EPR naturally tend to decrease or increase with rising airspeed during the takeoff roll and up to 400' (higher pressure at the front means a lower EPR?) or does more air into the engine improve the efficiency of the engine (= more thrust). My only experience is from engine ground test runs. Some adjustments cannot be carried out on the engine if the windspeed is above a certain value.
It will continued to close on EPR Command, even if EPR actual has not lined up with EPR Command when it enters 'lock and lapse".
I assume you mean the thrust lever position EPR command (not the FMC-generated limit set during the preflight).
Anyway, much appreciated. I'm always surprised at the depth of knowledge here.
Cheers.