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Except as otherwise provided in this chapter, no structure or tree shall be erected, altered, allowed to grow, or maintained in any airport approach zone, airport turning zone or airport transition zone to a height in excess of the height limit herein established for such zone. For purposes of this regulation, the following height limits are hereby established for each of the zones in question as delineated on the map which accompanies this chapter:\nApproach Zone:\n1′ vertical to 50′ horizontal for a distance of 10,000′ and 1′ vertical to 40′ horizontal for an additional 40,000′.\nHorizontal Surface:\nFor a distance of 10,000′ from the Airport Reference Point, below elevation 212′ MSL.\nConical Surface:\nFor a distance of 5,000′ measured outwardly from the Horizontal Surface, below a rise of 1′ in 20′ above the Horizontal Surface.\nTransition Surfaces:\nBelow a rise of 1′ vertical to 7′ horizontal measured from the Established Airport Elevation to an intersection with the Horizontal Surface and from the inclined plane located directly over the Approach Zone to the Horizontal Surface or to the Conical Surface.\nBuilding Line:\nNo buildings, poles, lines or similar obstruction;

al Surface and from the inclined plane located directly over the Approach Zone to the Horizontal Surface or to the Conical Surface.\nBuilding Line:\nNo buildings, poles, lines or similar obstruction; 750′ from center line of runway.