# STC SA174NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Machen Inc, United States
- Description: Installation of Continental IO-360 engine and McCauley D2A34C67/76-C2 propeller and associated changes
- Applied: November 14, 1974
- Status date: May 7, 1975
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-766](https://openairdocs.org/tcds/A-766)
- Certificate PDF: https://openairdocs.org/files/sha256/7c/e5/7ce58fec5d7223193ba643c499e4ed5591a273348e7ab41f54056de809759779
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/604FF5FA3B6B014186257AE100575515.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA174NW

## ADs that name it (0)

None.

## Approved models (1)

- Swift Museum Foundation Inc. GC-1B ([TCDS A-766](https://openairdocs.org/tcds/A-766))

## What the certificate says

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

## Every issue (1)

- May 7, 1975: Issued, Current. [certificate](https://openairdocs.org/files/sha256/7c/e5/7ce58fec5d7223193ba643c499e4ed5591a273348e7ab41f54056de809759779)

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