# STC SA09238AC-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-674-20/30.
- Applied: June 12, 1997
- Status date: June 16, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A17](https://openairdocs.org/tcds/3A17)
- Certificate PDF: https://openairdocs.org/files/sha256/35/fb/35fbb493722fa6b6a40e73141b8065e7b66cd760c3d8d95c6aae58f771037d1d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D3F4594DF5A6F29285256CC1007F3A36.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09238AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Cessna Aircraft Company R172J ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company R172K ([TCDS 3A17](https://openairdocs.org/tcds/3A17))

## 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: SA09238 AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Certifies that the change in the type design for the flowing product with the limitations and conditions therefor as specifed hereon meets the aiworthiness regurements of Part 3 of the bird Air Regulations.

Original Product . I ype berlipcale Number: 3A17 Make: Cessna Model: R172J AND R172K Description of Type Design Change:

Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-674-20/30, according to Bulletin No. 774, dated 6-11-97 and Master Drawing List No. 921007, dated 6-11-97 or later FAA Approved revisions of the above data (14 Volt System).

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891425, dated 6-16-97 is required for S-TEC System 20 for Cessna Models R172J and R172K or later FAA Approved revisions of the above supplement.

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

suspended, rocked or a termination date is otherwise established by the Administator of the Federal I vation Administration.

Date of Application: 6-12-97 Date Reissued:

Date of Issuance: 6-16-97 Date Amended:

By Direction of the Administrator FEDERAL AVIATION 1 icle Hamas (Signature) TOMNISTRATOR William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title)

FAA Förm 8110-2 (10-68) Page 1 of 2

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09238 AC-D Limitations and Conditions: (con't.)

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891431, dated 6-16-97 is required for S-TEC System 30 for Cessna Models R172J and R172K or later FAA Approved revisions of the above supplement.

3. 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 -

The EAR will reissue the certificate in the name of the transferee and forward it te mm.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and 2TP 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)

- June 16, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/35/fb/35fbb493722fa6b6a40e73141b8065e7b66cd760c3d8d95c6aae58f771037d1d)

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