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Old 11th Dec 2012, 13:34   #1 (permalink)
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Join Date: Dec 2012
Location: Germany
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Separations on converging runways

I'm working on my diploma thesis dealing about the modeling of runway capacities. Since I'm not that familiar to the ATC and the actual start/landing procedures, there are some questions left. It would be great if you might help me:

Imagine two converging runways: What separations need to be considered for two departing aircraft with intersecting flight paths? Which role plays the distance and the angle between the the runways? Are there regulations concerning the dependencies of arrivals and departures like for parallel runways?

Thanks for your help!
Spitfire01234 is offline  
Old 19th Dec 2012, 07:39   #2 (permalink)
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No. On converging runways for departures the preceding aircraft must have passed trough the point where the extended centrelines meet before the second can be cleared for takeoff.
1Charlie is offline  
Old 20th Dec 2012, 19:06   #3 (permalink)
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As you appear to be located in Germany, I would reference ICAO Doc 4444 Air Traffic Management...
FlightPathOBN is offline  
Old 20th Dec 2012, 20:07   #4 (permalink)
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Place I worked had "cross" runways, i.e. departure runway with landing traffic crossing, and there were no laid down instructions. It was basic ATC and training.
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Old 21st Dec 2012, 04:56   #5 (permalink)
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Originally Posted by 1Charlie
On converging runways for departures the preceding aircraft must have passed trough the point where the extended centrelines meet before the second can be cleared for takeoff
HD, should this have applied LHR 10R versus 05?
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Old 21st Dec 2012, 12:12   #6 (permalink)
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Depends where the crossing point is as if an aircraft is airborne before the crossing point then vortex has to be considered depending on the wake turbulence category of the first departing aircraft. If vortex wake separation is not applicable then there are no applicable separations. However depending on the direction of turn of each aircraft there may be reason for the tower controller to provide separation or the radar controller to use headings to separate. I.e 1st a/c departs on rw36 with a left turn and 2nd a/c departs rw27 with a right turn. In this case a controller would use headings or hold the second on the ground until the first passes A4.0 then release the second to only climb to A4.0. For landing a/c the first a/c must be past the intersection before the second is cleared to land or the first a/c has held short of the intersection. For parallel runways vortex has to be considered if the distance between the runways is less than 760m. In the USA they have different rules and can actually clear the second a/c for take off before the first a/c has passed the intersection but I think they have a lot of provisos e.g. Cavok, daylight, dry etc but not sure exactly what happens over the pond.
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