# STC SE41N

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: CRMA6, Rue Marceau, France
- Description: Increase in compression ratio to 6.75:1, substitution of 12:1 impeller ratio and other modifications to R-1340 engines, equivalent to S1H2, S3H1 and S3H2(not equipped with reduction gear).
- Status date: January 1, 1960
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS 5E-2](https://openairdocs.org/tcds/5E-2), [TCDS E-129](https://openairdocs.org/tcds/E-129), [TCDS E-143](https://openairdocs.org/tcds/E-143)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/04E208B4A282F7D0862570D2006B6410.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE41N

## ADs that name it (0)

None.

## Approved models (4)

- Pratt & Whitney Division R-1340 Series ([TCDS 5E-2](https://openairdocs.org/tcds/5E-2))
- Pratt & Whitney Division Wasp S1H2 ([TCDS E-129](https://openairdocs.org/tcds/E-129))
- Pratt & Whitney Division Wasp S3H1 ([TCDS E-143](https://openairdocs.org/tcds/E-143))
- Pratt & Whitney Division Wasp S3H2 ([TCDS E-129](https://openairdocs.org/tcds/E-129))

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