# STC ST939SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Aeronautical Engineers, Inc, United States
- Description: Installation of livestock pen.
- Status date: June 10, 1977
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BA487E1C0B0281C785256CC3000374D5.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST939SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 707-300C ([TCDS 4A26](https://openairdocs.org/tcds/4A26))

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