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FACILITY REQUIREMENTS taxiways be designed and built to ADG III/TDG 5 standards. In 2012, the FAA revised criteria for taxiway design dimensions and appropriate fillet design. The previous standard used the ADG, which is based on the aircraft wingspan and tail height, to determine appropriate taxiway dimensions and fillet design. Current standards now require the taxiway dimensions be designed to meet newly established TDGs, which are based upon the undercarriage dimensions, specifically the Main Gear Width (MGW) and the Cockpit to Main Gear (CMG) dimensions. Depending upon demand, portions of an airfield may be designed for one specific aircraft type while other portions are designed for other aircraft types. At EUG the west runway and taxiway complex is the primary facility serving commercial aircraft, with the east complex acting as a reliever for general aviation activity but also serving as redundancy in the event the main runway is unusable. Therefore, the taxiways connecting both Runway 16R-34L and Runway 16L-34R to the commercial apron are required to meet the design standard of the critical aircraft. The FAA recommended design standards for ADG III/TDG 5 taxiways are provided in Table 3-13. TABLE 3-13 COMMERICAL SERVICE TAXIWAYS Taxiway Taxiway Taxiway Centerline to Centerline to Taxiway Taxiway Taxiway Fillet Shoulder Safety Area Object Free Parallel Fixed or ComponentsWidthDesign WidthWidthArea WidthTaxiway Movable Object Requirement 75'30'(1)118'186'152'93'(2) (ADG III, TDG 5) TWY A N/A X TWY B N/A X TWY C X TWY D N/A X TWY E N/A X TWY F N/A X TWY G N/A X TWY J X TWY L X TWY P N/A X (1) FAA Advisory Circular 150/5300-13A, Change 1 recommends paved shoulders for ADG III aircraft. (2) See Section 406, paragraph (b) in FAA Advisory Circular 150/5300-13A, Change 1 for fillet design dimensions. Source: FAA Advisory Circular 150/5300-13A, Change 1 The existing taxiways and associated connectors were compared to the design standards set forth in Advisory Circular 150/5300-13A Change 1, Airport Design, in an effort to identify deficiencies. In the table, a checkmark denotes when the taxiway meets the specified design standard, while a bold “X” denotes that it is insufficient to meet FAA requirements or recommendations. FAA design standards recommend that taxiway shoulders be paved for all taxiways that serve ADG III aircraft. For the taxiways serving commercial service aircraft, it is recommended that paved shoulders be installed. Taxiway fillets for all taxiways serving EUGENE AIRPORT MASTER PLAN 3-18