bluerider777
Thanks for that. Our sep standards are the same here as Oz, including H-H 4NM.
I recall the change in attitude to WT in Melbourne in the mid 90's when it went from "do your best to get it" to " its non-negotiable". I remember several instances when the Tower started sending people around if a/c were handed off without the required WT sep, much to the chagrin of the APP controller.
It all seems logical of course, but its interesting to see how busy airports have interpreted the rules on a "needs must" basis. I'm sure Heathrow's capacity would fall way short of demand if controllers had to start applying a buffer.
Any other places out there that allow some "infringement" of the sep standards?
P.S. Out of around 900 movements a day here, more than 600 are Heavy. Light = zero!