Today I think everybody, in Europe at least, do Noise Abatement Takeoffs (that means accelerating at 3000ft AGL).
But what about go around?
Can't get an official answer from my boss, but I think noise abatement is not required during a go around, because it's somewhat considered an emergency manoeuver, and it takes place before the runway, thus not sounding the bell on the houses after the runway.
