Illinois Administrative Code (Last Updated: March 27, 2024)

§16.60. Conical Surface

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a)         A conical is a surface that extends outward and upward from the periphery of the horizontal surface at a slope of 20 feet horizontally for each foot vertically, for a horizontal distance of 4,000 feet.

b)         The conical surface does not include the precision instrument approach surface (see Section 16.80) and the transitional surfaces (see Section 16.90).

c)         There is no conical surface for Departmental standards.

                    
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