# STC SA09208AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- 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: September 23, 1998
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/84/32/8432cb7e6aa1d44ae631d6334aa7f670edbeec764f4c2771360800d24422bf3f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/61865A42DD832F9F85256CC1007F3A15.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09208AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Cessna Aircraft Company 172R ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172S ([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: SA09208AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Part 28 of the I ederal A viation Regulations.

Original Product Type Certifcate Number: 3A12 Make: Cessna Model: 172R and 172S 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, Revision 2, dated 9-18-98 and Master Drawing List No.

92989, Revision B, dated 9-18-98 or later FAA Approved revisions of the above data (28 Volt System).

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement P/N 891356, dated 5-12-97, is required for Cessna Model 172R for S-TEC System 20 or later FAA Approved revisions of the above supplement.

(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: 9-23-98, Revision 1 By Direction of the Administrator FEDERAL AVIATION (Signature) TOMINSTRATO DAS Staff Coordinator, DAS 5 SW Michael Keiran (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09208AC-D, Revision 1 Limitations and Conditions: (con't.)

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement P/N 891362, dated 5-12-97, is required for Cessna Model 172R for S-TEC System 30 or later FAA Approved revisions of the above supplement.

3_ FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement P/N 891356, Revision 1, dated 9-23-98, is required for Cessna Models 172R and 172S for S-TEC System 20 or later FAA Approved revisions of the above supplement.

4. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement P/N 891362, Revision 1, dated 9-23-98, is required for Cessna Models 172R and 172S for S-TEC System 30 or later FAA Approved revisions of the above supplement.

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

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

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code) 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)

- September 23, 1998: Amended, Current. [certificate](https://openairdocs.org/files/sha256/84/32/8432cb7e6aa1d44ae631d6334aa7f670edbeec764f4c2771360800d24422bf3f)

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