My point is CEP, that large heavy aircraft do not lose 20 kts immediately. What rate are you planning for the speed reduction?
Three Wire - depends on a/c type, but generally I expect 2-3 miles before that 20kts is bled off.
Without wishing to upset anyone, one of the contributing factors is that the number of people reporting 160knts is often unrelated to the number actually flying the speed they report. If you don't fly the assigned speeds accurately how can we be expected to achieve any standardisation in final approach spacing?
TowerRanger - Hopefully we'll get a link to RAK's new mode S radar......then we'll be able to see what's actually happening with those speeds.....