# STC SH4635SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Enviro Systems Inc., United States
- Description: Belt driven Freon Air Conditioning System in accordance with Drawing List DL8-1, Revision A, dated September 24, 1982, for Models 206A and 206B; or Drawing List DL-8-15, Revision A, dated September 24, 1982, for Model 206L-1; or later FAA Approved revisions.  Drawing List DL-8-1, Revision B, dated November 11, 1982, for Models 206A and 206B; Drawing List DL-8-15 Revision B, date November 11, 1982, are required for installation of Casey Shroud Heater in conjunction with air conditioner.
- Applied: August 3, 1981
- Status date: June 20, 2003
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H2SW](https://openairdocs.org/tcds/H2SW)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6E18685725C734EB86256D710060AF38.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SH4635SW

## ADs that name it (0)

None.

## Approved models (5)

- Bell Helicopter Textron (Canada) 206A ([TCDS H2SW](https://openairdocs.org/tcds/H2SW))
- Bell Helicopter Textron (Canada) 206B ([TCDS H2SW](https://openairdocs.org/tcds/H2SW))
- Bell Helicopter Textron (Canada) 206L ([TCDS H2SW](https://openairdocs.org/tcds/H2SW))
- Bell Helicopter Textron (Canada) 206L-1 ([TCDS H2SW](https://openairdocs.org/tcds/H2SW))
- Bell Helicopter Textron (Canada) 206L-3 ([TCDS H2SW](https://openairdocs.org/tcds/H2SW))

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