# STC SA4-28

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Met-Co-Aire, United States
- Description: Conversion to tricycle gear type airplane by moving the location of the main gear aft and by the installation of a nose wheel gear
- Applied: February 23, 1956
- Status date: May 31, 1956
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-799](https://openairdocs.org/tcds/A-799)
- Certificate PDF: https://openairdocs.org/files/sha256/ea/eb/eaeb5d3169459b2f312810783fc92f1d95dd0c2ee624ead06e00bbf03a94d0b3
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C631458CF4017426862579FA0071A64D.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-28

## ADs that name it (0)

None.

## Approved models (3)

- Cessna Aircraft Company 170 ([TCDS A-799](https://openairdocs.org/tcds/A-799))
- Cessna Aircraft Company 170A ([TCDS A-799](https://openairdocs.org/tcds/A-799))
- Cessna Aircraft Company 170B ([TCDS A-799](https://openairdocs.org/tcds/A-799))

## What the certificate says

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

## Every issue (1)

- May 31, 1956: Issued, Current. [certificate](https://openairdocs.org/files/sha256/ea/eb/eaeb5d3169459b2f312810783fc92f1d95dd0c2ee624ead06e00bbf03a94d0b3)

---
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.