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Each transitional surface, shown on Spence Bay Airport Zoning Plan No. E.2739 dated July 25, 1989, is a surface consisting of an inclined plane rising at a ratio of 1 m measured vertically to 7 m measured horizontally at right angles to the centre line and projected centre line of the strip and extending upward and outward from the lateral limits of the strip and its approach surfaces to an intersection with the outer surface.
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