"...prior to level acceleration."
ICAO Annex B noise abatement climb procedure is set standard to 3000ft. The procedure is usually some thing like climb to 1500 ft at V2 plus 10, set climb thrust, then to 3000 ft at V2 plus 10 and commence acceleration to 250 kts with clean up. This is usually not a level acceleration though.
So where a chart calls for "Climb to 4000' prior to level acceleration" such as the COR2F Departure on 10-3b (Jepp) in Athens does, what does one actually do differently, and why? As much GENUINE info on this subject as is out there would be appreciated.