# STC SA547SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Bendix Corporation Avionics Div, United States
- Description: Installation of Bendix M-4D auto- matic flight control system in- cluding optional manual electric trim and optional flight director system in serial numbers 402B0301 and up, 4140351 and up, and421B0301 and up.
- Status date: August 17, 1973
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0B84EFFF2D8B84D685256CC200122969.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA547SO

## ADs that name it (0)

None.

## Approved models (3)

- The Cessna Aircraft Company 402B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- The Cessna Aircraft Company 414 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- The Cessna Aircraft Company 421B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))

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