Investigation EA89035: Vehicles

Status

CLOSED

Opened

Aug 29, 1989

Closed

Nov 16, 1990

Model years

—

Subject

RETURN SPRING

Component: Vehicle speed control › Linkages

Summary

Summary:subject electronic pedals are equipped with a double returnspring.two units reportedly have completely failed, with several othersexperiencing a single spring failure.williams attempted to address theissue with a service bulletin mandating an annual inspection of the subjectsprings, and biannual replacement.this procedure is deemed unrealisticfor over the road truck operators.failure of the springs results in wideopen throttle.williams currently is conducting a fleet survey andadditional durability testing to determine the magnitude of the problem.at least two trucks manufacturers have issued strongly worded servicebulletins concerning this matter.this problem appears to have safetyimplications.additional information is needed.===

An NHTSA investigation looks into whether a safety defect exists. Opening one is not a finding. Outcomes can include a recall, closure without action, or further inquiry.