# STC SEW-1

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Steward-Davis Inc, United States
- Description: Adapters and oil seals on the dual accessory housing assemblies.
- Status date: January 1, 1960
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS E-243](https://openairdocs.org/tcds/E-243)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/691EDD48449B9539862570D2006C887C.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SEW-1

## ADs that name it (0)

None.

## Approved models (1)

- Curtiss-Wright/Marquette Inc. Cyclone 736C9HD Series ([TCDS E-243](https://openairdocs.org/tcds/E-243))

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