# STC SA3121SO

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: RT Aerospace Corp, United States
- Description: Installation of an all tourist class interior reconfiguration of 105 passenger seats.
- Applied: July 31, 1991
- Status date: June 24, 2008
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/d2/30/d230099c1b00e2b86463a99de2046e7c3c461e1d96ae7e1094cd3c1c1acf3c84
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/06971CF189A3F8C886257480007AB7F8.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3121SO

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-9-30 Series ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- June 24, 2008: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/d2/30/d230099c1b00e2b86463a99de2046e7c3c461e1d96ae7e1094cd3c1c1acf3c84)

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