# STC SA09121AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 55 Two Axis Automatic Flight Guidance System, Model ST-603
- Applied: September 21, 1995
- Status date: April 19, 2001
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A23EU](https://openairdocs.org/tcds/A23EU)
- Certificate PDF: https://openairdocs.org/files/sha256/f6/df/f6df911e6b523fc37d96287cde27cf5753764635b6a58f290fa6fea8f652dd19
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7D91FF4C5930340A85256CC1007F39C6.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09121AC-D

## ADs that name it (0)

None.

## Approved models (8)

- Cessna Aircraft Company F337E ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))
- Cessna Aircraft Company F337F ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))
- Cessna Aircraft Company F337G ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))
- Cessna Aircraft Company F337H ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))
- Cessna Aircraft Company FT337E ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))
- Cessna Aircraft Company FT337F ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))
- Cessna Aircraft Company FT337GP ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))
- Cessna Aircraft Company FT337HP ([TCDS A23EU](https://openairdocs.org/tcds/A23EU))

## 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: SA09121AC-D I his Certifiente isned te S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 9 at 23 of the Federal & viation Regulutions.

Original Product F ype Certifieute A umber: A23EU Al ate : Reims Aviation S.A.

Model: F337E, FT337E, F337F, FT337F, F337G, FT337GP, F337H, FT337HP Description of Type Design Change:

Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-603, according to Bulletin No. 703, Revision 2, dated 4-19-01 and Master Drawing List No. 92806, Revision B, dated 4-19-01 or later FAA Approved revisions of the above data (28 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: 9-21-95 Late wissued:

Date of Issuance: 9-29-95 Date Amended: 4-19-01 By chinction of the iS deinstrator FEDERAL AVIATION milk (Signature) TOMINSTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title)

FAA Porm 8110-2 (10-68) Page 1 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):

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA09121AC-D Limitations and Conditions: (con't.)

1. Also eligible on The Above Models When Modified Per STC SA937CE (Horton STOL Craft Conversion).

Also eligible on The Above Models When Modified Per STC SA1627WE (Robertson STOL Conversion).

FAA/DAS Approved Supplemental Flight Manual, P/N 891200, dated 9-29-95 is required for Reims Aviation S.A. Models F337E, FT337E, F337F, FT337F, F337G, FT337GP, F337H, and FT337HP When Modified Per STC SA1627WE (Robertson STOL Conversion) or later FAA Approved revisions of the above supplement.

4. FAA/DAS Approved Supplemental Flight Manual, P/N 891201, dated 9-29-95 is required for Reims Aviation S.A. Models F337E, FT337E, F337F, FT337F, F337G, FT337G, F337H, and FT337HP And The Above Models When Modified Per STC SA937CE (Horton STOL Craft Conversion) or later FAA Approved revisions of the above supplement.

5. FAA/DAS Approved Supplemental Flight Manual, P/N 891200, Revision 1, dated 4-19-01 is required for Reims Aviation S.A. models F337E, FT337E, F337F, FT337F, F337G, FT337GP, F337H, and FT337HP when modified per STC SA1627WE (Robertson STOL conversion) for S-TEC System 55/55X or later FAA Approved revisions of the above supplement.

6. FAA/DAS Approved Supplemental Flight Manual, P/N 891201, Revision 1, dated 4-19-01 is required for Reims Aviation S.A. models F337E, FT337E, F337F, FT337F, F337G, FT337G, F337H, and FT337HP and the above models when modified per STC SA937CE (Horton STOL Craft Conversion) 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.

## Every issue (1)

- April 19, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/f6/df/f6df911e6b523fc37d96287cde27cf5753764635b6a58f290fa6fea8f652dd19)

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