Minimum jet separation on final
In the absense of departures and cross runway operation, what is the minimum distance or time between arriving medium jets? Is 4 nm enough? Should following aircraft make small speed adjustments based on TCAS to achieve optimum separations? Assume there is a high speed exit for around 40 kts or more, how far from the approach end should the exit begin?
What would be the procedure for A320 and B737 or heavier types? To be more sure of making the exit, would auto brake medium be selected for landing and then released ASAP for any required manual braking when nominated high speed exit is assured?
Departures would have to be considered at some stage. How would that work on a single runway or with 2 rwys at Brisbane? Without a parallel runway are we destined to have the same holding delays in a few years when traffic increases further?
With 3 runways in operation at Zaventem, X rwy long sequences of landings have been observed, all at 3.75 - 4 nm separation, but it was very very tight if preceeding aircraft made an exit at a slower than necessary speed. A go-around was inevitable if the landing aircraft missed the high speed.
Much experience with low separation will be on airfields with wide spaced parallel runways. Anyone have low separation experience on other busy sub-standard airfields like Brisbane?