Glideslope & noise
From a curious pax and interested observer of the arguments for and against the 3rd runway at Heathrow:
I have been told that at City aiport a steeper angle of approach is used for noise reasons. If so why is this not used at an airport such as Heathrow and if it could be what sort of reduction in decibels can be expected over the sort of distance typically used for finals into Heathrow flying east to west?