Hi Centi. (Hope all the rotating valve Seals are in working order)
Further to Bevan66's info, WIA (Perth Airport Corp) produce a quarterly noise report. It is available to the operators upon request.
While I did,nt have a really good read, I did see the noise footprint diagrams and some excersions outside the (approved?) overlays.
Not aware that anyone has ever been pulled up over them, and we do have those sweet sounding 727's operating from over here during the early morning and evening.
Richo