# STC SA774SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Avitas Engineering, United States
- Description: Installation of the Litton LTN-211 Omega Navigation System.
- Status date: June 5, 1992
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/870BF9B01FFD5CAF85256CC20056A466.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA774SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727-200 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

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