Current through Register Vol. 49, No. 1, January 3, 2025
Section 16.60 - Conical Surfacea) 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.Ill. Admin. Code tit. 92, § 16.60