Engineer:
I have already clearly stated that I know less than nothing about Super 27s. It may well be that you need full chat to get the thing off the ground for all I know.
All I know is that we always derate when it is at all possible (which it is 99% of the time) and it causes a hell of a lot less noise for the attenuators near to the runway to pick up.
Actually, a lot of noise violations are caused by some really p*ss-poor tracking by the crew after take-off and I have witnessed some amazing performances over the last 40-odd years.
PS. Please note that the callsign is JW411 and not JW411a.