Originally Posted by
joepilot
Does anybody know what the maximum reduction normally allowed for takeoff is? I have seen 15% reductions allowed (note: not 15% N1, 15% of actual thrust). Are other aircraft allowed a greater reduction?
Joe
Boeing goes TO, TO1, TO2- representing full, -5%, and -15%, in addition each of these ratings may be assumed off for temp up to 53 degrees C giving no more than a 25% reduction at most. The FMS will limit thrust reduction.
A rated thrust( TO, TO1, TO2) implies that you will not increase thrust in event of an engine failure, whereas an assumed thrust gives you that option.
Bottom line is the crew is responsible for input of the correct weight and other takeoff data, a critical step that all crewmembers must verify.