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<br />San Marcos Municipal Airport IS <br />currently used by a wide variety of <br />general aviation aircraft, ranging from <br />small single engine aircraft, small and <br />medium sized helicopters, general <br />aviation business aircraft, and military <br />aircraft. <br /> <br />General aviation aircraft using the <br />airport include small single and multi- <br />engine aircraft (which fall within <br />approach categories A and Band ADG <br />D and business turboprop and jet <br />aircraft (which fall within approach <br />categories B, C, and D and ADGs I and <br />II). <br /> <br />The most demanding based aircraft is <br />currently a Citation 525 (business jet), <br />a Beech King Air 200, and the <br />Swearingen Metro aircraft operated by <br />Berry Aviation. The Metro and Citation <br />fall in ARC B-1, while the Beech King <br />Air 200 is a B-II aircraft. The airport is <br />also currently utilized by transient <br />corporate aircraft ranging from smaller <br />Lear and Citation jets to the <br />Gulfstream models III and IV (C-II/D- <br />II) on an infrequent basis. <br /> <br />Based corporate aircraft fall within <br />ARC B- II are estimated to conduct more <br />than 250 operations annually. <br />Itinerant general aviation aircraft <br />range up to ARC D-II (G-IV). Based <br />upon the higher approach speeds of <br />common business jets (such as the <br />Citation 525 based at the airport), <br />business aircraft within ARC B-II <br />comprise the current critical design <br />aircraft at the airport. In the future, it <br />can be expected the full range of <br />business jets will operate at the airport <br />on a more frequent basis. Ultimate <br />planning should consider ARC D- II as <br />the critical aircraft to properly plan for <br /> <br />the full range of business jets under <br />75,000 pounds. Primary Runway <br />should be planned to accommodate all <br />aircraft up to ARC D-II. The remaining <br />crosswind runways should be planned, <br />at a minimum to accommodate ARC B- <br />II aircraft. <br /> <br />The design of taxiway and apron areas <br />should consider the wingspan <br />requirements of the most demanding <br />aircraft to operate within that specific <br />functional area on the airport. <br />Transient general aviation apron and <br />aircraft maintenance and repair hangar <br />areas should consider ADG II <br />requirements to accommodate typical <br />business jet aircraft. T-hangar and <br />small conventional hangar areas should <br />consider ADG I requirements as these <br />commonly serve smaller single and <br />multi-engine piston aircraft. <br /> <br />RUNWAY LENGTH <br /> <br />The determination of runway length <br />requirements for an airport are based <br />on five primary factors: airport <br />elevation; mean maximum temperature <br />of the hottest month; runway gradient <br />(difference in elevation of each runway <br />end); critical aircraft type expected to <br />use the airport, and stage length of the <br />longest nonstop trip destinations. <br />Aircraft performance declines as each of <br />these factors increase. <br /> <br />For calculating runway length <br />requirements at HYI, the airport <br />elevation is 597 feet above mean sea <br />level (MSL) and the mean maximum <br />temperature of the hottest month is <br />94.7 degrees Fahrenheit (July). For <br />Runway 12-30 the overall difference in <br />runway end elevations is 20 feet. <br /> <br />3-6 <br />