# STC SA1666NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Franklin Aircraft Engines Inc., United States
- Description: Installation of a Franklin 6A-335-B or 6A-335-B1 engine, McCauley 2A31C/84S-4 to -8 propeller, spinner and associated systems. Modification includes installation of a 40 amp alternator, Model SFA 5582.
- Applied: April 6, 1982
- Status date: July 2, 2001
- Product: Aircraft, Single-Engine
- Data sheets: [TCDS A-767](https://openairdocs.org/tcds/A-767)
- Certificate PDF: https://openairdocs.org/files/sha256/a4/3c/a43c353e7bc1ab7ea34176866a412a840925372202e82141425ac21f1c48313c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID119757089420240826141510.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1666NM

## ADs that name it (0)

None.

## Approved models (2)

- Univair Aircraft Corporation 108-2 ([TCDS A-767](https://openairdocs.org/tcds/A-767))
- Univair Aircraft Corporation 108-3 ([TCDS A-767](https://openairdocs.org/tcds/A-767))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA1666NM This certificate issued to: Franklin Aircraft Engines, Inc.

136 Racquette Drive Fort Collins, CO 80524 Certifies that the change in the type design for the following product with the limitations and conditions therofor as specified hereon meets the airworthiness requirement's of Part 3 of the CIVIL AIR Regulations.

Original Product -- Type Certificate Number: A-767 Make: Univair (Stinson) Model: 108-2&108-3 Description of Type Design Change: Installation of a Franklin 6A-335-B Or 6A-335-B1 engine, McCauley 2A31C/84S-4 to -8 propeller, spinner, and associated systems in accordance with Seaplane Flying, Inc. Assembly and Installation Instruction No. SP108-20699.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to aircraft of this model on which other previously approved modifications are incorporated. Unless, it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate and FAA Approved Airplane Flight Manual Supplement shall be maintained as part of the permanent records for the modified aircraft.

Conditt, Jr.

(Signature) TOMINISTRATOR Eual M. Conditt, Jr.

Associate Manager, Airframe & Services Wichita Aircraft Certification Office (Title) 000, or imprisonment not exceeding 3 years, or both.

## Every issue (1)

- July 2, 2001: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/a4/3c/a43c353e7bc1ab7ea34176866a412a840925372202e82141425ac21f1c48313c)

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