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NTL Classification:NTL-AVIATION-AVIATION
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Abstract:In July 1996, a new wake vortex category was created for the B757 which placed it
between revised Large and Heavy categories. Shortly thereafter, the B757-300, stretched
version of the B757-200, was placed in service and soon was treated by Air Traffic Control
as a Heavy aircraft due to its maximum certificated takeoff weight. This study examines the
behavior of vortices from both aircraft during approach/landing operations and shows little
difference between the vortices of the two B757 series. In fact, both measurements and
theory indicate that B757-300 vortices decay somewhat faster than B757-200 vortices.
Therefore, the B757-300 is being penalized by unneeded increased wake vortex spacing
during approach/landing operations.
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