# STC SA09207AC-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 20/30 single and two axis automatic flight guidance systems, Model ST-671-20/30.
- Applied: May 8, 1997
- Status date: May 12, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/e6/b1/e6b1822da617884370e84e492c7aabe3d80dae622a72278328f9d73759b8ec7c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5E9A303A76E816E685256CC1007F3A14.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09207AC-D

## ADs that name it (0)

None.

## Approved models (4)

- Cessna Aircraft Company 172M ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172N ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172P ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172Q ([TCDS 3A12](https://openairdocs.org/tcds/3A12))

## 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: SA09207AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Tral Well, x 16064926 Certifies that the change in the type design for the following product with the limitations and conditions thorofor as speciped horeon meats the anorthiness regurements of Part 3 of the Civil ter Regulations.

Original Product I so Certifcate Number: 3A12 Make: Cesssna Model: 172M, 172N, 172P AND 172Q Description of Type Design Change: ;

Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-671-20/30, according to Bulletin No. 771, dated 5-07-97 and Master Drawing List No. 92989, dated 5-07-97 or later FAA Approved revisions of the above data (28 Volt System).

Also eligible on Cessna Models 172M, 172N, and 172P When Modified By 180 H.P. Engine Conversion.

(See Continuation Sheet, Page 2, a part of this STC)

Date of Application: 5-08-97 Date Reissued:

Date of Issuance: 5-12-97 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Wicine House

TOMINISTRATO William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09207AC-D Limitations and Conditions: (con't.)

FAA/DAS Approved Supplemental Flight Manual, P/N 891354, dated 5-12-97 is required for Cessna Models 172M; and 172N, S/N 17271034 And Below; and Cessna Models 172M; and 172N, S/N 17271034 And Below When Modified By 180 H.P. Engine Conversion for S-TEC System 20 or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891355, dated 5-12-97 is required for Cessna Models 172N, S/N 17271035 And On; 172P and 172Q;

and Cessna Models 172N, S/N 17271035 And On and 172P When Modified By 180 H.P. Engine Conversion for S-TEC System 20 or later FAA Approved revisions of the above supplement.

4. FAA/DAS Approved Supplemental Flight Manual, P/N 891360, dated 5-12-97 is required for Cessna Models 172M; and 172N, S/N 17271034 And Below; and Cessna Models 172M; and 172N, S/N 17271034 And Below When Modified By 180 H.P. Engine Conversion for S-TEC System 30 or later FAA Approved revisions of the above supplement.

5. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891361, dated 5-12-97 is required for Cessna Models 172N, S/N 17271035 And On; 172P and 172Q;

and Cessna Models 172N, S/N 17271035 And On and 172P When Modified By 180 H.P. Engine Conversion for S-TEC System 30 or later FAA Approved revisions of the above supplement.

6. Compatibility of this modification with other previously approved modifications must be determined by the installer.

FAA Porm 8110-2-1(10-69) Page 2 of 2

The FAA will reissue the certificate in the name of the transferee and forward it to inm

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP sode) from (Name of grantor) (Print or type) (Address of grantor) (Number & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- May 12, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/e6/b1/e6b1822da617884370e84e492c7aabe3d80dae622a72278328f9d73759b8ec7c)

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