# STC SA09159AC-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-635,
- Applied: July 16, 1996
- Status date: May 25, 2001
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A13](https://openairdocs.org/tcds/2A13)
- Certificate PDF: https://openairdocs.org/files/sha256/56/18/5618ab4793e5ab8f6add4d5c4a1816dd7a61288bd33be79a7caf5d9c6ce83f7a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/09431691D661118385256CC1007F39F5.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09159AC-D

## ADs that name it (0)

None.

## Approved models (1)

- Piper Aircraft Inc. PA-28-235 ([TCDS 2A13](https://openairdocs.org/tcds/2A13))

## 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: SA09159AC-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 limitations and conditions thorefor as specifed hereon meets the airrorthiness requiroments of Part 3 of the Civd Air Regulations.

Original Product Type Cortificate Number: 2A13 Make: Piper Model: PA-28-235 Description of Type Design Change:

Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-635, according to Bulletin No. 735, Revision 2, dated 5-25-01 and Master Drawing List No. 92942, Revision B, dated 5-25-01 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.

Federal & viation Administration.

Date of Application: 7-16-96 Date Reissued:

Date of Issuance: 7-22-96 Date Amended: 5-25-01 By Direction of the Administrator FEDERAL AVIATION (Signature) TOMNISTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09159AC-D Limitations and Conditions: (con't.)

1. Eligibility limited to Piper model PA-28-235, S/N 28-7310001 and Up.

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891285, dated 7-22-96 is required for Piper Model PA-28-235, S/N 28-7310001 & Up or later FAA Approved revisions of the above supplement.

3. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891285, Revision 1, dated 5-17-01 is required for Piper model PA-28-235, S/N 28-7310001 and up 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.

The FAA will reissue the certificate in the name of the transferer and forward it to him

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP codel 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 25, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/56/18/5618ab4793e5ab8f6add4d5c4a1816dd7a61288bd33be79a7caf5d9c6ce83f7a)

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