# STC SA09151AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-616,
- Applied: May 6, 1996
- Status date: October 12, 2001
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/8e/d3/8ed33cdbc758851156f7061f3cb72a33757970fa9acd6685ae392067ad2adbd5
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/584F62EC9DC8E51785256CC1007F39EC.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09151AC-D

## ADs that name it (0)

None.

## Approved models (8)

- Cessna Aircraft Company 172D ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172E ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172F (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172G ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172H (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172I ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172K ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172L ([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: SA09151AC-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 following froduct with the limitutions and conditions therefor as specified heron meets the airothiness requiements of Past 3 of the Civil In Regulations.

Original Product I ype Certifcate A umber : ЗА12 Make: Cessna Model: 172D, 172E, 172F, 172G, 172H, 1721, 172K, and 172L Description of Type Design Change:

Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-616, according to Bulletin No. 716, Revision 2, dated 10-12-01 and Master Drawing List No. 92925, Revision B, dated 10-12-01 or later FAA Approved revisions of the above data (14 Volt System).

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

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Date of Application: 5-06-96 Sate wissued:

I ate of issmence: 5-09-96 Date Amended: 1-21-99, 10-12-01 By Direction of the Administrator (Signature) TOMINSTRATIO Michael Keiran DAS Staff Coordinator, DAS 5 SW (Title)

FAA Form 8110 2110-68: Page 1 of 1

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09151 AC-D Limitations and Conditions: (con't.)

Also eligible on the above models when modified per STC SA420CE or STC SA4428SW (180 H.P.

engine conversions) FAA/DAS Approved Supplemental Flight Manual, P/N 891255, dated 5-09-96 is required for Cessna Models 172D, 172E, 172F, 172G, 172H, 1721, 172K, and 172L And The Above Models When Modified Per STC SA420CE (Lycoming Engine 0-360-AID, 180 H.P.) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Supplemental Flight Manual, P/N 891255, Revision 1, dated 1-21-99 is required for Cessna models 172D, 172E, 172F, 172G, 172H, 1721, 172K, and 172L and the above models when modified per STC SA420CE or STC SA4428SW (180 H.P. engine conversions) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Supplemental Flight Manual, P/N 891255, Revision 2, dated 10-12-01 is required for Cessna models 172D, 172E, 172F, 172G, 172H, 1721, 172K, and 172L and the above models when modified per STC SA420CE or STC SA4428SW (180 H.P. engine conversions) for S-TEC System 55/55X or later FAA Approved revisions of the above supplement.

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

or both.

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)

- October 12, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/8e/d3/8ed33cdbc758851156f7061f3cb72a33757970fa9acd6685ae392067ad2adbd5)

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