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whose location is fixed by function." The runway safety area (RSA) is defined as itA defined surface surrounding the runway prepared or suitable for reducing the risk of damage to airplanes in the event of an undershoot, overshoot, or excursion from the runway.1t The OFZ is defined as a "defined volume of airspace centered above the runway centerline whose elevation is same as the nearest point on the runway centerline and extends 200 feet beyond each runway end." The FAA has proposed a change to FAA AC 150/5300-13, Airport Design, to address new requirements for the transition to global positioning system (GPS) navigation. Draft Change 6 has proposed the precision object free (POFA) standards for all runways having or expected to have precision approaches. For San Marcos Municipal Airport, this is applicable to Runway 12 which is served by the existing instrument landing system (ILS) precision approach. This standard would not apply to any other runway ends at this time since they are not served by a precision instrument approach. The FAA expects these areas to be under the control ofthe airport and free from obstructions. As noted previously, the critical aircraft for Runway 12-30 currently falls within ARC B-II. In the future this is expected to transition to ARC D-II. At a minimum ARC B-II design standards are applicable to the crosswind runway, however, consideration will be given in the next chapter for the crosswind runway to meet ARC C-II standards. This would better situate the airport for times 3-12 when the primary runway is closed for any reason. A review of the existing aerial photography reveals that both runways comply with RSA, OF A and OFZ standards. The next chapter, Airport Development Alternatives, will examine RSA, OF A and OFZ standards considering each potential runway extension alternative. LIGHTING AND MARKING Currently, there are a number of lighting and pavement markings aids serving pilots and aircraft using HYI These lighting and marking aids assist pilots in locating the airport during night or poor weather conditions, as well as assist in the ground movement of aircraft. Runway markings are designed according to the type of instrument approach available on the runway. FAAAC 150/5340-1F,MarkingofPaved Areas on Airports , provides the guidance necessary to design an airport's markings. Runway 12-30 is equipped with precision runway markings. Runway 8-26 is marked with nonprecision markings, while Runways 4-22 and 17-35 are equipped with basic markings. The precision markings on Runway 12-30 will be sufficient. The crosswind runway should provide nonprecision markings to support a GPS approach. Taxiway and apron areas also require marking to assure that aircraft remain on the pavement. Yellow centerline stripes are currently painted on all taxiway and apron surfaces at the