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AIRPORT MASTER PLAN <br />Taxiway Design Standards <br />In general, taxiway design can be segmented into two general categories: <br />1.Taxiway Pavement Design <br />2.Taxiway Layout Based on Aircraft Design Group <br />(ADG) <br />Each of these design categories play a critical role in evaluating the sufficiency of <br />taxiway pavements at an airport both now and in the future. <br />Taxiway Pavement Design <br />Taxiway pavement design is complex because it is based on landing gear <br />configurations which vary widely amongst different aircraft types. The FAA has <br />classified the numerous variations of landing gear configurations into various <br />Taxiway Design Groups (TDG) that now guide taxiway pavement design. <br />Additionally, taxiway pavement design standards have changed significantly over <br />the past 10 years. Prior to 2012, taxiway pavement design was based on <br />Aircraft Design Group (ADG), which categorizes aircraft based on wingspan and tail <br />height. In 2012, when TDG based standards came into effect, taxiway pavement <br />design and fillet dimensions changed significantly. The most significant change was <br />that the size of taxiway fillets increased significantly. These new TDG based <br />standards went through another minor revision in 2014. <br />Consequently, at many airports, any taxiway pavements that were designed prior to <br />2012 do not meet the current TDG based standards. As a result, as these taxiway <br />pavements are re-constructed, they need to be re-designed to current TDG <br />standards. <br />The taxiways at the San Marcos Regional Airport are no different. The taxiways at <br />the San Marcos Regional Airport are designed to older ADG based pavement design <br />standards that were in effect prior to the new TDG standards being instituted. <br />Consequently, the taxiway fillets at the airport do not meet the existing TDG <br />standards and practices. <br />Facility Requirements Chapter Page 35 of 70 <br />October 2020 <br /> <br />