# NHTSA Preliminary Evaluation PE91021
> **STEPWELL CORROSION** · Opened 1990-11-30 · Closed 1991-03-18
## Investigation
- **Action number:** PE91021
- **Type:** Preliminary Evaluation
- **Open date:** 1990-11-30
- **Close date:** 1991-03-18
- **Manufacturer:** NEOPLAN USA CORPORATION
- **Affected makes:** NEOPLAN
- **Affected components:** STRUCTURE
- **Affected model years:** 1983, 1984, 1985
- **Affected (make, year) variants:** 3
## Summary

There is no summary currently available

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE91021)
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