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Vehicle Factors

Vehicle Factors. Vehicle Issues. Postfire vehicle examination Lack of systematic vehicle maintenance/inspections No Federal requirement for wheel bearing inspections Wheel bearing maintenance information. Prefire Events. At 5:50 a.m., motorist Sees sparks

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Vehicle Factors

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  1. Vehicle Factors

  2. Vehicle Issues • Postfire vehicle examination • Lack of systematic vehicle maintenance/inspections • No Federal requirement for wheel bearing inspections • Wheel bearing maintenance information

  3. Prefire Events • At 5:50 a.m., motorist • Sees sparks • Sees wheel hub glowing orange–red • Stops motorcoach • Tells motorcoach driver of right-rear wheel glowing orange–red • Motorcoach driver pulls over to interstate shoulder

  4. Accident Motorcoach Bearings Damaged bearing rollers Undamaged wheel bearing

  5. Sources of Friction and Heat • Lack of wheel bearing lubrication caused roller deformation • Deformed rollers shifted brake components, causing friction and heat • Temperatures increased within wheel well and ignited rubber tire

  6. Accident Vehicle Maintenance • No evidence of systematic scheduled maintenance • Driver did not conduct pretrip inspections or check hub oil levels • Vehicle manufacturer specifies checking hub oil levels daily • Global’s owner reported not paying drivers to conduct pretrip/posttrip vehicle inspections as required

  7. Federal Vehicle Inspections • Accident motorcoach manufacturer specified daily hub oil inspections • No Federal requirements for inspection

  8. MCI Maintenance Manual • Lack of specific warning on consequences of inadequate wheel bearing lubrication • Need to warn vehicle owners of this problem

  9. Motorcoach Associations • Advise members of dangers and consequences of wheel bearing failure • Advise manufacturers to review maintenance manuals accordingly • Advise manufacturers to disseminate customer advisory bulletins

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