Six types of zones, and the height limits for said zones, are established for the purposes of airport zoning. Except as otherwise provided in this chapter, no structure or tree shall be erected, altered, allowed to grow or maintained in any zone to a height in excess of the height limit established for such zone. The datum plane for measurement of such height, except as otherwise specified herein, shall be based on the airport elevation, as defined by Section 17.50.030. Said zones are as follows:
A. Landing Zone ("L"). A surface, and the airspace above it, rectangular in shape, longitudinally centered on the runway and extending in length two hundred (200) feet beyond the ends of the runway. The landing zone shall have an elevation, at any point along its longitudinal profile, coincident with the runway centerline or centerline prolongations as appropriate. The landing zone shall have the width specified on each map adopted pursuant to Section 17.50.050.
B. Approach Zone ("AA"). A plane surface and the airspace above it, trapezoidal in shape, longitudinally centered on the prolongation of the runway centerline, beginning at each end of each landing zone, coinciding in width with the landing zone where they join. The height and width of the approach zone shall be as specified on each map adopted pursuant to Section 17.50.050.
C. Landing Transition Zone ("LT"). A plane surface, and the airspace above it, rectangular in shape, lying adjacent and parallel to each side of each landing zone, having a length equal to the landing zone and extending outward and upward, at eight angles to the runway centerline, at a slope of seven-to-one to a height of one hundred fifty (150) feet above the established airport elevation.
D. Approach Transition Zone ("AT"). A plane surface and the airspace above it, triangular in shape, lying adjacent to each side of each approach zone and at each end of each landing transition zone, coinciding in height with the approach outward and upward, at right angles to the prolongation of the runway centerline, at a slope of seven-to-one to a maximum airport elevation or to the conical zone surface, whichever is higher.
E. Horizontal Zone ("H"). A horizontal circular plane surface, and the airspace above it, one hundred fifty (150) feet above the established airport elevation, its radius point being the airport reference point and having the radius specified on each map adopted pursuant to Section 17.50.050. The horizontal zone does not include the landing zone or transition zones.
F. Conical Zone ("C"). A conical surface of an inverted conical fustrum, and the airspace above it, its minor base being coincidental with the periphery of the horizontal zone and extending outward and upward, radially to its axis, at a slope of twenty-to-one for the horizontal distance specified on each map adopted pursuant to Section 17.50.050. The conical zone does not include the approach zone at the approach transition zone. (Ord. 2017-01 (part), 2017: prior code § 7624)