For wake turbulence, parallels separated by less than how many feet are considered the same runway for small aircraft and a B757?

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Multiple Choice

For wake turbulence, parallels separated by less than how many feet are considered the same runway for small aircraft and a B757?

In wake turbulence rules, how close parallel runways sit to each other changes how we apply separation. If the centerlines are less than seven hundred feet apart, those runways are treated as the same runway for wake-vortex purposes, even for small aircraft and a B757. That’s because vortices from an aircraft can drift across to the adjacent runway when the distance is that tight, so the tighter same-runway spacing rules must be used to keep safety margins. When the separation is seven hundred feet or more, the runways can be treated as independent for wake turbulence, allowing different minima since the vortices are less likely to affect operations on the other runway. So seven hundred feet is the cutoff for considering the runways the same in this context.

In wake turbulence rules, how close parallel runways sit to each other changes how we apply separation. If the centerlines are less than seven hundred feet apart, those runways are treated as the same runway for wake-vortex purposes, even for small aircraft and a B757. That’s because vortices from an aircraft can drift across to the adjacent runway when the distance is that tight, so the tighter same-runway spacing rules must be used to keep safety margins. When the separation is seven hundred feet or more, the runways can be treated as independent for wake turbulence, allowing different minima since the vortices are less likely to affect operations on the other runway. So seven hundred feet is the cutoff for considering the runways the same in this context.

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