# STC SA680NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Hemmingson, E. U., United States
- Description: Installation of a Lycoming engine, Machen engine mount, Hartzell propeller, Beech exhaust sytem, modified cowl with cowl flaps
- Applied: January 12, 1978
- Status date: October 19, 1978
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-799](https://openairdocs.org/tcds/A-799)
- Certificate PDF: https://openairdocs.org/files/sha256/81/23/81238f476ece5825bc1ee6bf1e31430661f6633677cf639f9b4a322e7d00839d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CB4AE52DE845542886257A41006C62CE.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA680NW

## ADs that name it (0)

None.

## Approved models (1)

- 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)

- October 19, 1978: Issued, Current. [certificate](https://openairdocs.org/files/sha256/81/23/81238f476ece5825bc1ee6bf1e31430661f6633677cf639f9b4a322e7d00839d)

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