# STC SA2156SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Independent Air, Inc, United States
- Description: Installation of an auxiliary flight attendants seat on the forward bulkhead of the left aft galley. (707-331B)
- Status date: April 11, 1987
- 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/78E1C0C320B906C585256CC200015A5B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2156SO

## ADs that name it (0)

None.

## Approved models (1)

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

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