# STC SEW-4

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Exhaust Parts Inc, United States
- Description: Exhaust system parts.
- Status date: January 1, 1960
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS E-272](https://openairdocs.org/tcds/E-272), [TCDS E-287](https://openairdocs.org/tcds/E-287)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5F195D9ED12DBA19862570D2006912CD.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SEW-4

## ADs that name it (0)

None.

## Approved models (2)

- Curtiss-Wright/Marquette Inc. Cyclone 972TC18DA Series ([TCDS E-272](https://openairdocs.org/tcds/E-272))
- Curtiss-Wright/Marquette Inc. Cyclone 981TC18EA Series ([TCDS E-287](https://openairdocs.org/tcds/E-287))

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