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AC 150/5300-4 .CHG 3 12/5/78 * f, .Airspace. All airport. hazards should be removed. An obstruction to air navigation according to the criteria or standards prescribed in FAR 77.23, Standards for Determining Obstructions, as applied in FAR 77.25, Civil Airports Imaginary Surfaces, and FAR 77.29, Airport Tmaginary Surfaces for Heliports, is deemed to be an airport hazard unless an FAA airspace determination has found the obstruction not to be a hazard to air navigation. Requests for an FAA aeronautical study of existing obstructions to air navigation may be initiated by anyone with a valid interest in the matter. An FAA approved airport layout plan and an FAA determination of no objection to an FAR Part 157 proposal, in part, are blanket FAA airspace determina- tions of no hazard to navigation covering all existing obstructions and all proposed construction included in the airport layout plan or the airport proposal. g. Terminal Navigational Facilities. Desired operational clearances for terminal navigational facilities should be provided and maintained. AC 150/5300-2 describes in general terms the land area, grading requirements, and operational clearance desired for air navigational aids (NAVAIDs) and for air traffic control (ATC) facilities. h. Terminal Instrument Procedures. Serious consideration should be given to removal of the controlling obstacles relative to existing and planned terminal instrument procedures. In establishing instrument procedures, the FAA Terminal Instrument Procedure Specialist makes the determination of the controlling obstacle. i. Taxiways. All objects within one-half wingspan of the critical aircraft plus 25 feet (8 m) from taxiway centerline should be removed except for frangibly mounted air navigational aids which, because of their function, must be located near the taxiway. 17. CLEARANCE OVER HIGHWAYS AND RAILROADS. a. Figure 5-2 shows the recommended minimum clearance for the vertical distance between,a highway, railroad, or traverse way and a clearance surface. When the landing area of an airport is to be extended or a new airport is to be constructed near a highway or railroad, maintain adequate clearance between them. b. It should be noted that the clearances shown in Figure 5-2 are minimum.. Attain greater clearance for future needs whenever possible. Further avoid the location of a traverse way of any type within the building restriction line. If a small secondary road is allowed to cross this area, it may be only a few years before it is a primary highway with adjacent light standards, powerlines, and sign boards. Page 16 chap•5 Par 16