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Motorcoach Run Off Bridge and Rollover Sherman, Texas August 8, 2008

Motorcoach Run Off Bridge and Rollover Sherman, Texas August 8, 2008. Introduction Robert Accetta. Background Information. 2002 MCI 56-passenger motorcoach Operated by Iguala BusMex Left 8:30 p.m., August 7, 2008 55 passengers Completed 309 miles (600-mile-trip) Right front tire failed

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Motorcoach Run Off Bridge and Rollover Sherman, Texas August 8, 2008

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  1. Motorcoach Run Off Bridge and Rollover Sherman, TexasAugust 8, 2008

  2. IntroductionRobert Accetta

  3. Background Information 2002 MCI 56-passenger motorcoach Operated by Iguala BusMex Left 8:30 p.m., August 7, 2008 55 passengers Completed 309 miles (600-mile-trip) Right front tire failed 12:45 a.m. - August 8, 2008 Recorded speed of 68 mph

  4. Collision Sequence Brakes applied Impact bridge railing 110 feet 1.1 seconds 143 feet 1.9 seconds 253 feet 3.0 seconds Final rest Tire blowout 136 feet Source: NTSB

  5. Pieces of tire Impact with bridge railing Tire mark Source: NTSB

  6. Area of displaced bridge railing Source: NTSB

  7. Source: NTSB Source: Sherman, Texas Police Department

  8. 8 feet to the earthen median Displaced railing Orientation and final rest position of motorcoach Source: NTSB

  9. Front of motorcoach Bridge railing Source: NTSB Source: Sherman, Texas Police Department

  10. Detached overhead luggage rack Failed tire Source: NTSB

  11. Injuries • 17 Passenger fatalities • 38 Passengers injured, minor to serious injuries • Driver serious injuries Source: NTSB

  12. On-scene Staff Chris Voeglie – Vehicle & Recorder Factors David Rayburn – Highway Jim LeBerte – Motor Carrier Hank Hughes – Survival Paula Sind-Prunier, PhD – Human Performance Eric Grosof – Family Assistance Bridget Serchak – Media Relations Robert Accetta – IIC Chairman Hersman – Member On-Scene Nancy Lewis – Special Assistant

  13. Report Development Deborah Bruce, PhD – Project Manager Gwynne O’Reagan – Editor Julie Perrot – Safety Recommendations Dr. Mitch Garber – Medical Analysis Kristin Poland, PhD – Biomechanical Engineer Avis Clark – Audiovisual Support

  14. Parties To Investigation Federal Motor Carrier Safety Administration Texas Department of Public Safety Sherman Police Department Texas Department of Transportation Motor Coach Industries (MCI), Inc. Bridgestone Tire Company

  15. Safety Issues • Tire Pressure Monitoring Systems • Commercial Vehicle Inspections • Bridge Railing Standards • FMCSA Oversight • Occupant Protection Source: NTSB

  16. Tire Failure Tire Pressure Monitoring Vehicle InspectionsChris C. Voeglie

  17. Tire Failure Source: Bridgestone Puncture location on failed tire

  18. Tire Failure Source: Bridgestone Close-up Exterior View of Puncture Location

  19. Evidence of Excessive Heat Source: Bridgestone Tearing within 2nd and 3rd belts & areas of excessive heat discoloration

  20. Evidence of Over-Deflection Source: Bridgestone Circumferential Rim Flange Compression Grooving & Diagonal Undulations

  21. Investigative Findings Source: Bridgestone Tread Splice Interface and Heat-Related Discoloration Within the Torn Shoulder

  22. Summary • Retread did not cause failure • Failure caused by excessive heat • Heat caused by under-inflation • Under-inflation caused by slow leak Source: Bridgestone

  23. Tire FailureTire Pressure MonitoringVehicle Inspections

  24. Importance of Proper Inflation • Under-inflation is the leading cause of tire failure • Pretrip inspection • TREAD Act • TPMS for passenger vehicles • TPMS for commercial vehicles

  25. Visual Inflation Inspection Source: http:www.safecar.gov Source: http:www.safecar.gov 32 psi 16 psi

  26. Visual Inflation Inspection Source: Michelin Source: Micvhelin 130 psi 85 psi

  27. Visual Inflation Inspection Source: Michelin, NA Source: Michelin, NA 130 psi 85 psi

  28. Tire FailureTire Pressure MonitoringVehicle Inspections

  29. Commercial Vehicle Inspection • FMCSRs require annual inspection • FMCSA certifies state criteria • Texas program approved in 1994 • No quality assurance and oversight program

  30. Commercial Vehicle Inspection • Certificate issued 8 days before the accident • “5-Minute Inspections” Texas state-certified facility • Numerous unsafe conditions • Retreaded tire on steer axle • Under-inflated tag-axle tires • Wrong tag-axle wheels • Grossly contaminated brake assembly

  31. Commercial Vehicle Inspection • Placed out-of-service next day • Reports contained errors & omissions • Not equipped for commercial vehicles • Not enough time to inspect • Inspection fee restricted to $62 • Insufficient oversight of inspection facilities

  32. State Oversight of Inspections • “5-Minute Inspections” recertified • Lack of an official audit process • No review of inspector knowledge or experience • Inadequate inspection of facility/equipment

  33. State Oversight of Inspections • Texas Department of Public Safety • Took no action with the facility or inspector • Audit insufficient to provide meaningful information • No oversight of inspection facilities or inspectors it authorizes

  34. Summary • FMCSA performs inadequate oversight of approved state equivalent inspection programs • FMCSA requires no oversight or quality control by the states

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