# STC SA1774SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Southern Express Airways, Inc, United States
- Description: Installation of a TIO-540-J2B or TIO-540-J2BD Lycoming engine on the left side and LTIO-540-J2B or LTIO-540-J2BD Lycoming engine on the right side.
- Status date: April 12, 1985
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A20SO](https://openairdocs.org/tcds/A20SO)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5109966D3C5C159E85256CC10083D03E.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1774SO

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-31-350 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))

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