# STC SA09020AC-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-597
- Applied: September 4, 1995
- Status date: October 10, 2001
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A8EA](https://openairdocs.org/tcds/A8EA)
- Certificate PDF: https://openairdocs.org/files/sha256/bc/8e/bc8e27ddba2daaac03f3b6ec5a9b4d9f15250266054b2f02441c4b36ff34c9f0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/762E1A9E5AF1F92885256CC1007F39A9.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09020AC-D

## ADs that name it (0)

None.

## Approved models (1)

- Piper Aircraft Inc. PA-31P ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))

## 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: SA09020AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Part 3 of the Cird Air Regulations.

Original Product Type Certificate Number: ASEA Make: Piper Model: PA-31P Description of Type Design Change:

Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-597, according to Bulletin No. 697, Revision 5, dated 10-10-01 and Master Drawing List No. 92802, Revision E, dated 10-10-01 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: 9-04-95 Date Reissued:

Date of Issuance: 9-21-95 Date Amended: 10-10-01 By Direction of the Administrator FEDERAL AVIATION (Signature) TOMINISTRATO 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: SA09020AC-D Limitations and Conditions: (con't.)

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891195, dated 9-21-95 is required for Piper Model PA-31P 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 891195, Revision 1, dated 10-10-01 is required for Piper model PA-31P 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.

FAA Form 8110-2-1(10-69) Page 2 of 2

## Every issue (1)

- October 10, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/bc/8e/bc8e27ddba2daaac03f3b6ec5a9b4d9f15250266054b2f02441c4b36ff34c9f0)

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