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are for their determination, which may differ from the FAA's <br />determination. <br />5) Section 2.1.3 adds reference to FAA Advisory Circular <br />150/5190- 4A, A Model Zoning Ordinance to Limit Height of <br />Objects Around Airports for Commission Review. This FAA <br />Advisory Circular provides specific guidance for establishing <br />zoning regulations along with specific guidance on a <br />"variance" process for potential obstructions. At Section 3.b., <br />"The Federal Aviation Administration (FAA) conducts <br />aeronautical studies on obstructions which examine their <br />effect on such factors as: aircraft operational capabilities; <br />electronic and procedural requirements; and, airport hazard <br />standards. If an aeronautical study shows that an obstruction, <br />when evaluated against these factors, has no substantial <br />adverse effect upon the safe and efficient use of navigable <br />airspace, then the obstruction is considered not to be a hazard <br />to air navigation [emphasis added]." <br />6) FAA AC 150/5190-413, Airport Land Use Compatibility <br />Planning, references 14 CFR Part 77/Obstruction Evaluation <br />(OE) Processes and Surfaces, and the FAA's standards and <br />regulations that protect the nation's airspace: "14 CFR Part <br />77, `Safe, Efficient Use and Preservation of Navigable <br />Airspace,' establishes standards for determining and defining <br />objects that may pose potential obstructions to air navigation. <br />14 CFR Part 77 was developed by the FAA to promote safety, <br />and the efficient use and preservation of the navigable <br />airspace. The airspace areas governed by 14 CFR Part 77 are <br />called `imaginary surfaces.' <br />7) Caltrans Division of Aeronautics — Caltrans publishes the <br />Handbook in accordance with State Law with the purpose to, <br />"provide information to ALUCs, their staffs, airport proprietors, <br />cities, counties, consultants, and the public; to identify the <br />requirements and procedures for preparing effective <br />compatibility planning documents; and define exemptions <br />where applicable (Caltrans, 2011)." The Handbook provides <br />specific guidance for assessing potential airspace <br />obstructions in Section 4.5 Airspace Protection. <br />8) JWA — The FAA requires airport sponsors like Orange <br />County to accept specific grant assurances when they <br />accept federal funding. Hazard Removal and Mitigation and <br />Compatible Land Use are two of these assurances (49 U.S.C. <br />§ 47107(a)(9) and (10)). For hazard removal, the Airport <br />relies on the FAA's aeronautical study to meet its <br />requirement. For compatible land use, the Airport relies on <br />coordination with the surrounding cities and the ALUC. The <br />following are the specific assurances: <br />(a) Hazard Removal and Mitigation. It will take appropriate <br />Resolution No. 2025-XXX <br />Page 17 of 20 <br />