# STC SA340NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Franklin Aircraft Engines Inc., United States
- Description: Installation of Franklin 6A-350-C1 or 6A-350-C2 engine, McCauley2A31C21/84S-6 or Hartzell HC- C2YF-1BF/F8459 series propellers.
- Applied: May 26, 1979
- Status date: April 8, 1999
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/fd/bb/fdbb56ce4d30548ad04fd3599eff571c2e8ca166773568c8a4ef268dadc36fce
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7A65F1F18DBA72CB85256CC2000A97C7.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA340NW

## ADs that name it (0)

None.

## Approved models (11)

- Cessna Aircraft Company 172D ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172E ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172F (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172G ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172H (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172I ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172K ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172L ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172M ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172N ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172P ([TCDS 3A12](https://openairdocs.org/tcds/3A12))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- April 8, 1999: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/fd/bb/fdbb56ce4d30548ad04fd3599eff571c2e8ca166773568c8a4ef268dadc36fce)

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