# STC SH2281SW

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Associated Air Center, United States
- Description: Installation of environmental control unit.
- Status date: October 4, 1985
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H4SW](https://openairdocs.org/tcds/H4SW)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5569E279A3C01AC85256CC2005C2FAA.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SH2281SW

## ADs that name it (0)

None.

## Approved models (2)

- Bell Helicopter Textron 212 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))
- Bell Helicopter Textron 412 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.