Risk Assessment Method to Support Modification of Airfield Separation Standards (2011) / Chapter Skim
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From page 92... ...
G-1 Appendix G of the contractor's final report is not published herein, but is available on the TRB website at http://www.trb.org/Main/Blurbs/165180.aspx. A P P E N D I X G Summary of FAA/Boeing Taxiway Deviation Studies
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H-1 A P P E N D I X H Analysis of MOS Cases
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Case # Airport ID NPIAS MOS Type FAA Region 1 Philadelphia, PA PHL LH TWY/TWY AEA 2 Anchorage, AK ANC MH TWY /OBJ AAL 3 Addison, TX ADS RL RWY/TWY ASW 4 Bridgeport, CT BDR GA RWY/TWY ANE 5 Accomack, VA MFV GA RWY/OBJ AEA 6 Lincoln Park, NJ N07 RL TLN /OBJ AEA 7 New York JFK, NY JFK LH TWY/TWY AEA 8 Newark, NJ EWR LH TWY/TWY* AEA 9 Minneapolis, MN MSP LH TWY/TWY AGL 10 Chicago, IL ORD LH TWY/TWY AGL 11 Chicago, IL ORD LH TWY /OBJ AGL 12 Barnstable, MA HYA NH RWY/TWY ANE 13 Laconia, NH LCI GA RWY/TWY ANE 14 Seattle-Tacoma, WA SEA LH RWY/TWY ANM 15 Seattle-Tacoma, WA SEA LH TWY/TWY ANM 16 Aspen, CO ASE NH RWY/OBJ ANM 17 Nantucket, MA ACK NH TWY/TWY ANE 18 New Castle, DE ILG GA TWY/TWY AEA 19 Leesburg, VA JYO RL RWY/OBJ AEA 20 Taunton, MA TAN GA RWY/TWY ANE Table H-2 summarizes the cases by type of MOS; the majority of the cases were MOS for runway/taxiway separation and taxiway/taxiway separation.
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Justifications used to obtain MOS approval. MOS Justification Runway/ Taxiway Taxiway/ Taxiway Runway/ Object Taxiway/ Taxilane Taxiway/ Object Total Advisory Circular acceptable level of safety 2 3 1 1 2 9 Airport facilities' capacity 2 2 1 1 2 8 Communications 1 1 Delays/Congestion 2 2 Economic constraints 2 1 1 1 5 Environmental constraints 2 1 1 4 Operations capacity 3 1 1 5 Prior ADG standards compliance 2 1 3 Physical constraints 5 4 1 1 2 13 Runway/Taxiway separation 1 1 Security 1 1 Each MOS may have more than one justification Table H-4.
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Case Study #1 - Philadelphia International Airport (PHL) MOS Issue Taxilane/Taxilane Approval Date 6/7/1999 Separations OFA Centerline Wingtip Standard 423 ft 198 ft 27' Existing 330 ft 153.5 ft 23' Airport Ref Code C-III and C-IV Critical Aircraft Aircraft 1 Aircraft 2 Model Dash 8-300 Boeing 767 ADG III IV Wingspan 90' 171' Synopsis One of the parallel taxilanes would be designed to serve only Terminal F (Group III aircraft)
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the required 193 ft OFA centerline separation based on AC 150/5300-13, Chapter 4, Table 4-1. Restrictions Maintain Airbus A388 characteristics as most demanding aircraft.
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Relocating the parallel taxiway or the runway were not feasible options due to the limited area available to the airport for further development. Restrictions Maintain B-737 characteristics as most demanding aircraft.
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Sikorsky Memorial Airport (BDR) MOS Issue Runway/Taxiway Approval Date 8/04/2003 Separations OFA Centerline Wingtip Standard 300 ft 221 Existing 268–300 ft (variable)
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MOS Issue Runway/Object Approval Date 12/15/1992 Separations OFA Centerline Wingtip Standard 400 ft Existing 360 ft Airport Ref Code C-II Critical Aircraft Aircraft 1 Aircraft 2 Model ADG II Parked aircraft Wingspan Max 79 ft Max 79 ft Synopsis The aircraft parking area and agricultural storage shed located near the existing terminal building had a separation distance to the runway of 360 and 400 ft, respectively. Based on AC 150/5300-13, Chapter 2, Table 22, the standard required runway OFA for a C-II design aircraft is 400 ft, larger than the existing separation of 360 ft between the runway and the parking area.
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