# STC SA120NW

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Wiprud William, United States
- Description: Installation of Hartzell HC-B3P20-4/P10160-12E and/or 81HC-B3R20-4/R10160-12E propellers on Jacobs- Page R-755 series engines
- Applied: February 1, 1974
- Status date: April 20, 1977
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-790](https://openairdocs.org/tcds/A-790)
- Certificate PDF: https://openairdocs.org/files/sha256/32/ae/32aeda6668ef9b6ec6b220a7ecd770807be60f4768b01a0b0eb0c5a2f2b48d04
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5D3062BDB34E87D85256CC10080E006.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA120NW

## ADs that name it (0)

None.

## Approved models (3)

- Cessna Aircraft Company 190 ([TCDS A-790](https://openairdocs.org/tcds/A-790))
- Cessna Aircraft Company 195 ([TCDS A-790](https://openairdocs.org/tcds/A-790))
- Cessna Aircraft Company 195B ([TCDS A-790](https://openairdocs.org/tcds/A-790))

## What the certificate says

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

## Every issue (1)

- April 20, 1977: Amended, Current. [certificate](https://openairdocs.org/files/sha256/32/ae/32aeda6668ef9b6ec6b220a7ecd770807be60f4768b01a0b0eb0c5a2f2b48d04)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.