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6/24/75 AC 150/5300-4B CHAPTER 5. OBSTACLE REMOVAL AND LAND CONSIDERATION 16. OBSTACLE REMOVAL. a. The airport should be kept clear of all obstructions and, as far as practical, all existing obstructions removed. FAR Part 77, Objects Affecting Navigable Airspace, establishes standards for determining obstructions in navigable airspace. b. At utility airports where removal of existing obstructions is not practicable, the following obstacle clearance is an acceptable minimum: (1) A11 objects except for frangible -mounted air navigational aids which, because of their function, must be located near the runway should be cleared to ground level within the area 125 feet laterally either side of the runway centerline and extending 200 feet beyond the runway ends. (2) In no case should objects penetrate a surface that starts at the runway threshold and at the elevation of the runway centerline at the threshold and slopes upward from the runway at a slope of 20(horizontal) to 1(vertical). In the plan view, the centerline of this surface coincides with the runway centerline (extended). This surface extends laterally 125 feet on each side of the centerline at the runway threshold and increases uniformly to 350 feet on each side of the center- line at a point 2,250 feet from start; thereafte ,it extends laterally 350 feet on each side of the centerline for a distance of 2,750 feet. For new runways, it is recommended that this surface start 200 feet out from the runway end as shown in Figure 5-1. (3) Chap 5 Par 16 Desired operational clearances for terminal navigational facilities should be provided and maintained. Advisory Circular 150/5300-2, Airport Design Standards - Site Requirements for Terminal Navigational Facilities, describes in general terms the land area, grading requirementsyand operational clearances desired for air navigational aids (NAVAID) and air traffic control (ATC) facilities. (4) Serious consideration should be given to removal of the controlling obstacle(s) relative to existing and/or planned terminal instrument procedures. In establishing instrument procedures, the FAA Terminal Instrument Procedure Specialist. makes the determination of the controlling obstacle. Page 15