@Gulfstream757: that depends. We use 1000ft AGL as acceleration altitude anyway, not 1500ft, which moves the point of climb thrust reduction closer to the airport, however closer to the ground as well.
As i fly the 737, and i believe lederhosen does as well, we can user select derates 1 and 2, add assumed temperature to the mix and we can reduce our take off thrust by something around 35 to 40% of the full rated thrust. The FMC will automaticaly select a corresponding climb thrust which should be the same or higher than the reduced take off thrust, but actually quite often is not since climb 2 as lowest climb thrust setting is only a reduction by around 20%. The climb thrust ratings are user selectable as well. Since it is more economical to use full climb thrust to save fuel (shorter time to cruise level) we do that now.
Which means that we will get a huge increase of thrust at acceleration altitude, especially in a lightweight -700. And corresponding to that increase of thrust we will get an increase of noise output.
Last edited by Denti; 6th July 2012 at 16:45.
Reason: fingertrouble