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Vehicle Factors

Learn about the critical role of wheel bearing maintenance in preventing accidents, the factors leading to bearing damage, and the significance of regular vehicle inspections. Discover how lack of maintenance can result in catastrophic events and ways to address this issue effectively.

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Vehicle Factors

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Presentation Transcript

  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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