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<br />PJI.CILr1Y RIQJlRIItBRlS <br />~(Jf ".I.'IIIC&S <br /> <br />A.IRPad' JomSTER PIAN <br />SMI MAR:a;, 'mDS <br /> <br />Aim:ide ~ 1 ity p.pri. e...:ad.s <br /> <br />The number and type of based aircraft anticipated at San Marcos <br />Municipal Airport, as well as the total number of operations over the <br />p1anni.nq period, are very important in the determination of facility <br />requirements, and have direct influence with respect to the physical <br />improvements that must be provided to meet the anticipated demand. <br /> <br />Based aircraft forecasts by type directly influence the type of <br />runways, taxiways, and aprons required to safely and efficiently <br />operate the various types of aircraft that will use the facility. <br />Based upon the activity forecasts for San Marcos Municipal Airport, <br />the existing runway complex will be adequate for the twenty-year <br />planning period. <br /> <br />The Federal Aviation Administration classifies airports in general <br />categories resulting from the types of aircraft that will use the <br />airport, and in the role which the airport fills in the area that it <br />serves. There are two basic airport categories that we are ooncerned <br />wi th: Utility and Transport. San Marcos Municipal is currently <br />identified in the National Plan of Integrated Airport Systems (NPI1\S) <br />as a Transport category airport. As a general statement, single <br />engine piston aircraft require the Utility type nmways; multi -engine <br />piston aircraft also can use Basic Utility runways, but some of the <br />larger and heavier multi-engine aircraft will require Transport <br />category runways. All turbo-prcp aircraft can use the large Utility <br />or Transport airports. <br /> <br />Each of these FAA airport classifications has a corresp:mding range of <br />minimum runway lengths that are appropriate for the classification. <br />Table 3.1 shows the general range of runway lengths for an airport <br />with san Marcos Municipal's elevations and temperature characteris- <br />tics, by runway category. 'ft1e original runway length requirements, as <br />defined in the 1981 Airport Master Plan, are still valid. <br /> <br />Table 3.1 shows that there are different runway lengths within the <br />Utility classification. Each runway length is a result of the <br />differing operational requirements of a particular segment of the <br />General Utility aircraft fleet operated at varying percentages of the <br />aircraft's useful load. For example, the shortest runway length in <br />tle General Utility Stage II Classification (shown) is based upon the <br />accommodation of 75 percent of the general aviation fleet with the <br />aircraft loaded to carry 60 percent of its useful load. In this <br />particular case, the runway length is 4,600 feet. The Transport <br /> <br />3.1 <br />