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12/5/78 AC 150/5300-4B CHG 3 CHAPTER 5. LAND CONSIDERATION AND OBSTACLE RESTRICTION AND REMOVAL 16. OBSTACLE REMOVAL. The following subparagraphs, a through i, list the objects on, above, and around a utility airport that should be removed. a, Runway Safety Area. All objects within the runway safety area should be cleared to ground level, except for frangibly mounted air navigational aids which, because of their function, must be located near the runway. (See Figure 7-1 for length and width.) b. Obstacle Free Zone (OFZ). No object should penetrate the OFZ, except for frangible air navigational aids which, because of their function, must be located in the OFZ. (1) Nonprecision Instrument and Visual Utility Runway OFZ is the volume of space above the innermost 250 feet (75 m) of the primary surface. (2) Precision Instrument Runway OFZ is the volume of space above the innermost 300 feet (90 m) (400 feet (120 m) for runways expected to accommodate aircraft of more than 12,500 pounds (5 670 kg) maximum certificated takeoff weight) of the primary surface. (See Figure 5-1.) Precision Instrument Approach OFZ is the volume of space above a surface of same width as the runway OFZ which slopes 50 (horizontal) to 1 (vertical) away from the runway into the approach area. It begins 200 feet (60 m) from the runway approach threshold at that elevation and extends 200 feet (60 m) beyond the last light unit in the approach lighting system. (See Figure 5-1.) (4) Precision Instrument Inner Transitional Surface OFZ is the volume of space above the surface which slopes 3 (horizontal) to 1 (vertical) laterally from the edges of the runway OFZ and approach OFZ and ends at the height of 150 feet (45-m) above the established airport elevation. (See Figure 5-1.) c. Building Restriction Lines (BRL). Buildings should not be permitted between the building restriction lines. A11 trees located between the building restriction lines of precision instrument runways should be removed. Trees located outside the OFZ but between the building restriction lines of nonprecision instrument or visual runways should be treated in accordance with subparagraph f. (See Figure 7-1.) d. Runway Approach Threshold. Obstacle clearance criteria for runway approach thresholds are contained in Appendix 9. e. Runway Clear Zone and Site Preparation. Object clearance criteria for runway clear zones and site preparation are contained in FAR 152.87, Preparation of Site. (31 Chap 5 Par 16 Page 15