Part I Noise Abatement Procedures
Section 7 Noise Preferential Runways and Routes
Chapter 2 In general, where turns are required shortly after take-off
for noise abatement or other operational purposes, the
2.2.3. nominal track has not been designed in accordance with
the criteria in Volume II Part 2 Chapter 3 para 3.3.
However, no turns are to be commenced below a height
of 500 ft aal. Airport Operators may specify the criteria
used to determine individual Noise Preferential Routes.
These criteria are for guidance only and aircraft operators
should adhere to the routes to the maximum extent
practicable commensurate with the safe operation of the
aircraft.
Part I Aeroplane Operating Procedures
Section 7 Unless otherwise stated, the upper limit for noise abatement
procedures is 3000 ft alt. However, Chapter
3 aircraft operators are expected to operate their aircraft at all times in a
manner calculated to cause the least noise disturbance on the ground
is the exact wording from the UK AIP - sort of our version of your FAR/AIM. Note the UPPER limit - so in fact you can accelerate and clean up nice and low...