# STC SA2157SO

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Paul S Woods, United States
- Description: Installation of chemical evacuation system to remove residue from the agricultural spray dispersal system. (AT-502 RESTRICTED CATEGORY)
- Status date: March 3, 1993
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW), [TCDS A9SW](https://openairdocs.org/tcds/A9SW)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/09D043BE9320DDA485256CC200015A5F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2157SO

## ADs that name it (0)

None.

## Approved models (8)

- Air Tractor Inc. AT-300 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW))
- Air Tractor Inc. AT-301 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW))
- Air Tractor Inc. AT-302 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW))
- Air Tractor Inc. AT-400 ([TCDS A9SW](https://openairdocs.org/tcds/A9SW))
- Air Tractor Inc. AT-401 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-402 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-402A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-502 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))

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