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The airport reference point, shown on Wrigley Airport Zoning Plan No. E.3040, dated December 5, 1994, is a point located on the centre line of runway 10-28 at a distance of 533.4 m from the threshold of runway 10.
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The approach surfaces, shown on Wrigley Airport Zoning Plan No. E.3040, dated December 5, 1994, are planes abutting each end of the strip associated with runway 10-28 and are described as follows:
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The outer surface, shown on Wrigley Airport Zoning Plan No. E.3040, dated December 5, 1994, is an imaginary plane established at a constant elevation of 45 m above the elevation of the airport reference point, except that, where that plane is less than 9 m above the surface of the ground, the outer surface is located at 9 m above the surface of the ground.
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The strip associated with runway 10-28, shown on Wrigley Airport Zoning Plan No. E.3040, dated December 5, 1994, is 90 m in width, 45 m being on each side of the centre line of the runway, and 1 186.8 m in length.
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Each transitional surface, shown on Wrigley Airport Zoning Plan No. E.3040, dated December 5, 1994, is 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, 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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The outer boundary of the land to which these Regulations apply, shown on Wrigley Airport Zoning Plan No. E.3040, dated December 5, 1994, is a circle with a radius of 4 000 m centred on the airport reference point.
