# STC SA09404AC-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-837-20/30.
- Applied: May 5, 1999
- Status date: May 7, 1999
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A4CE](https://openairdocs.org/tcds/A4CE)
- Certificate PDF: https://openairdocs.org/files/sha256/5c/95/5c95e19123dda7410bdc50e55a0c327c5918c9bcc2c0d90e3a1af4dfc5aa86f9
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B2C6030AFFB12C9385256CC1007F3AE5.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09404AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Cessna Aircraft Company 206H ([TCDS A4CE](https://openairdocs.org/tcds/A4CE))
- Cessna Aircraft Company T206H ([TCDS A4CE](https://openairdocs.org/tcds/A4CE))

## 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: SA09404AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Past 23 of the Federal A viation Regulations.

Original Product I ype Certifcate A umber: A4CF Make: Cessna Al octel: 206H and T206H Description of Type Design Change:

Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-837-20/30, according to Bulletin No. 937, Revision 1, dated 5-04-99 and Master Drawing List No. 921118, Revision A, dated 5-04-99 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: 5-05-99 Date visaek Date of Issuance: 5-07-99 Date Amended:

FEDERAL AVIATION By Direction of the Administrator тівекі (Signature) TOMNISTRATOR Michael Keirnan DAS Staff Coordinator, DAS S SW (Title)

47.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09404AC-D Limitations and Conditions: (con't.)

1. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891844, dated 5-07-99 is required for Cessna models 206H and T206H for S-TEC System 20 or later FAA Approved revisions of the above supplement.

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891845, dated 5-07-99 is required for Cessna models 206H and T206H for S-TEC System 30 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

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)

- May 7, 1999: Issued, Current. [certificate](https://openairdocs.org/files/sha256/5c/95/5c95e19123dda7410bdc50e55a0c327c5918c9bcc2c0d90e3a1af4dfc5aa86f9)

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