# STC SH125WE

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Aviation Specialties, Inc, United States
- Description: Installation of AiResearch TSE-331-3U-303N engine and related changes. (Limited to serial number 55607).
- Status date: June 25, 1971
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS 1H4](https://openairdocs.org/tcds/1H4)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CE8BFC3C44F625AA85256CC2005C2E43.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SH125WE

## ADs that name it (1)

- [AD 75-22-12](https://openairdocs.org/ad/75-22-12): Inflight Power Loss · Sikorsky S-55, S-55B and S-55C with STC SH125WE or SH127WE. Effective Oct 31, 1975. Named in the applicability

## Approved models (1)

- Sikorsky Aircraft Corporation S-55B ([TCDS 1H4](https://openairdocs.org/tcds/1H4))

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