Hi Mutt
Originally Posted by mutt
csd,
Would you be so kind as to point out a technical reference showing that this is true or required?
Mutt
Sadly can't produce a technical reference but within my company it is a requirement that above a certain weight (at certain noise sensitive airports) we go max thrust. My understanding is that the shorter take-off roll together with the relatively high initial climb keeps the noise nearer the airport and with the gain in height the noise is then diluted more. Climb thrust is then selected early (1000' agl) so that by the time you are crossing the noise monitoring stations you have the added height together with the reduced thrust for climb rather than being lower and still with take-off thrust (albeit reduced).
I'm led to believe that this reduces our noise violations. Another airport where we use a similar policy is Brussels. Bear in mind that we only do this for heavy weight departures and where noise is an issue.
Regards
csd