# NHTSA Engineering Analysis EA89035
> **RETURN SPRING** · Opened 1989-08-29 · Closed 1990-11-16
## Investigation
- **Action number:** EA89035
- **Type:** Engineering Analysis
- **Open date:** 1989-08-29
- **Close date:** 1990-11-16
- **Manufacturer:** Williams Controls, Inc.
- **Affected makes:** WILLIAMS
- **Affected components:** VEHICLE SPEED CONTROL:LINKAGES
- **Affected model years:** 1985, 1986, 1987, 1988, 9999
- **Affected (make, year) variants:** 10
## 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.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA89035)
---
*AI Analytics · CC0 1.0*