# STC SA09283AC-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-724-20/30.
- Applied: September 12, 1997
- Status date: September 17, 1997
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-782](https://openairdocs.org/tcds/A-782)
- Certificate PDF: https://openairdocs.org/files/sha256/8e/74/8e747d267a384e5e25408a377bb7c60274f6a7ecf168efa065ba861f5eacbc69
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/81CF0B86550AEC4986257D11004DFFC2.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09283AC-D

## ADs that name it (0)

None.

## Approved models (7)

- Sierra Hotel Aero Inc. Navion A (Army L-17B and L-17C) ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion B ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion D ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion E ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion F ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion G ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion H ([TCDS A-782](https://openairdocs.org/tcds/A-782))

## 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: SA09283 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 following product with the limitations and conditions therefor as specifed hereen meets the airoshiness requiements of Past 3 of the Cied An Regulations.

Original Product I ype Certifcate Number: A-782 Make: Navion Model: A, B, D, E, F, G and H Description of Type Design Change:

Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-724-20/30, according to Bulletin No. 824, dated 9-11-97 and Master Drawing List No. 921027, dated 9-11-97 or later FAA Approved revisions of the above data (14 Volt System).

Only eligible on Models A, B, D, E, and F When Modified Per STC SA4-241 (Stabilizer Modification) and STC SA4-915 (Tip Tanks).

Also eligible on Models A, B, D, E, and F When Modified By 285 H.P. Engine Conversion.

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

Date of Application: 9-12-97 Date Reissued:

Date of Issuance: 9-17-97 Date Amended:

By Direction of the Administrator FEDERA AVIATION Wilin Humer Bignatu TOMINISTRATO William J. Thomas DAS Staff Coordinator, DAS 5 SW (hitle)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09283AC-D Limitations and Conditions: (con't.)

3. FAA/DAS Approved Supplemental Flight Manual, P/N 891535, dated 9-17-97 is required for Navion Models A, B, D, E, and F When Modified Per STC SA4-241 (Stabilizer Modification) and STC SA4-915 (Tip Tanks) And The Above Models When Modified By 285 H.P. Engine Conversion and Models G and H for S-TEC System 20 or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Supplemental Flight Manual, P/N 891536, dated 9-17-97 is required for Navion Models A, B, D, E, and F When Modified Per STC SA4-241 (Stabilizer Modification) and STC SA4-915 (Tip Tanks) And The Above Models When Modified By 285 H.P. Engine Conversion and Models G and H for S-TEC System 30 or later FAA Approved revisions of the above supplement.

5. 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 EAA will reissue the certificate in the name of the transferee and forwart it So hims

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 BIP codel Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- September 17, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/8e/74/8e747d267a384e5e25408a377bb7c60274f6a7ecf168efa065ba861f5eacbc69)

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