# STC SA3-34

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Northwest Airlines Inc, United States
- Description: Propeller reverse control circuit revision.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-812](https://openairdocs.org/tcds/A-812)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D0CED035C6DDE846862570CA00776B65.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3-34

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 377 ([TCDS A-812](https://openairdocs.org/tcds/A-812))

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