Enhanced time based separation scheduled for arrival early 2018 - NATS
eTBS stage 1 will bring the recategorisation (RECAT EU) of wake which will bring some reductions in separations.
It will permit wake separation to touchdown by taking into account aircraft speed profiles inside 4DME and runway occupancy times to predict compression encountered inside 4DME.
In essence, it will provide the radar controller with an indicator which shows threshold separation (wake or runway occupancy) + predicted compression. It will provide the tower controller with the threshold wake separation. Both controllers have the ability to see the other's indicator in cases of co-ordination.