MacDoris
Perfectly clear Tks
Warped Factor thanks for the info .....
Ironically keeping altitude will only keep the noise down if speed is reduce to an intermediate flap position about 180 kts clearly not ideal 20nm out .
You cannot decelerate on a 3 degree slope very easily . The only options are to put the gear down or throw out the speedbrakes both actions create noise , aerodynamic and in the case of the gear engine noise too as the engines spool up to prepare for a G/A.
If you descend to 3000 ' @ 20nm slow to app speed to intercept the glide from below in level decelerating flight , then follow the glide from 3000 ' , carefully judged you should have the thrust levers closed to 3.5 nm . I believe that this would be minimum noise as opposed to following the glide from 6000' not to mention more fuel and time expeditious .
atb
KFW