I am strictly an amateur guys so please all you techies dont give me stick, I just wish to learn!!
I live immediately below a S-SW approach to MEL, this approach is normally flown by all ac incoming from TASMANIA, for arrival runway 27. The point they fly over my home is normally 17-18 minutes to touch down. At this point JQ A320's sound as if the engine/engines are "winding down" momentarily then almost immediately they are "winding up" again. In some cases it happens a second time, then everything then goes back to normal. Any thoughts please.