Noise abatement
Anyone else concerned that a procedure where thrust (and noise) is increased at 1500 feet might not comply with the spirit of noise abatement. It is obviously SID dependent, but some late night departures have us also using improved climb and rotating most of the way down 4,000 meter runways.
I have raised this one with our experts and they claim that as we are making less noise by reducing takeoff thrust so much, it does not matter. Is anybody aware of any studies that have been carried out that would back this up and what do other people do?