Originally Posted by
RAT 5
To clarify my comments about spacing on finals: I was meaning staggered spacing. If the runways are too close for parallel approaches with the a/c 'side by side', then they can be staggered, at the same speed, with 2nm longitudinal spacing, but on the // runway. They would still have the required spacing of traffic ahead on their own runway, but staggered from the neighbouring one and thus achieve not lateral conflict.
As this graphic from a recent Heathrow presentation on IPAs illustrates:
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No prizes for spotting the dodgy trigonometry.
