# STC SA2121SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Advanced Technology & Research Inc, United States
- Description: Installation of fuselage interior shell assembly.
- Status date: June 4, 1987
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A12EA](https://openairdocs.org/tcds/A12EA)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C87F19CF8CBABF2385256CC2000159DD.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA2121SO

## ADs that name it (0)

None.

## Approved models (1)

- Gulfstream Aerospace Corporation G-IV ([TCDS A12EA](https://openairdocs.org/tcds/A12EA))

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