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AIRPORT MASTER PLAN <br />TABLE 4-14 <br />TAXIWAY DESIGN GROUPS <br />SAN MARCOS REGIONAL AIRPORT <br />Taxiway Width (ft)TDG <br />A (ramp area)753 <br />A (approach of RWY 8)503 <br />B 402 <br />C (north of TWY A)422 <br />C (south of TWY A)503 <br />E 422 <br />F 503 <br />J 503 <br />K 352 <br /> <br />Source: Garver, 2019. <br />As Table 4-14 shows, Taxiways Bravo, Charlie (north of Taxiway Alpha), Echo, and <br />Kilo do not have sufficient width to meet TDG-3 standards and should be widened <br />as part of future pavement rehabilitation projects. <br />Additionally, the potential change from the Embraer Brasilia E120 to the <br />Bombardier Q400 should be closely monitored as this change will have a significant <br />impact on taxiway design. The Bombardier Q400 is a TDG-5 aircraft. Current TDG-5 <br />taxiway design standards require a 75-foot-wide taxiway as opposed to the 50 foot <br />width requirement necessary to meet TDG-3 standards. If the move to the Q400 <br />occurs, taxiway routes that will be commonly utilized by the aircraft should be <br />upgraded to TDG-5 taxiway pavement design standards. <br />Taxiway Layout Design Standards Based on Aircraft Design Group (ADG) <br />While taxiway pavement design is based on TDG, Taxiway <br />Safety Area (TSA), Taxiway Object Free Area (TOFAs), and separation standards are <br />based on the Aircraft Design Group (ADG) of the critical aircraft for the taxiway. <br />These ADG based standards are based on the aircraft wingspan and tail height of <br />the critical aircraft. <br />Based on the Forecast Chapter, the current critical aircraft for the San Marcos <br />Regional Airport is in the ADG II category but there is the potential for the critical <br />aircraft to move into the ADG III category. <br />Facility Requirements Chapter Page 37 of 70 <br />October 2020 <br /> <br />