# STC SA09004AC-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 65 two axis automatic flight guidance system, Model ST-574.
- Applied: May 1, 1995
- Status date: May 26, 1995
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A8EA](https://openairdocs.org/tcds/A8EA)
- Certificate PDF: https://openairdocs.org/files/sha256/20/ea/20eafde8b858b6bb05b6adf6276618e4fb6d9b6f24bff5fb3abaca0a7e8f397b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6F45044BAB5B622585256CC1007F3995.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09004AC-D

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-31T ([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.

Huitri States of Sacrica Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SA09004AC-D This certificate issued to: S-TEC Corporation 946 Pegram Mineral Wells, TX 76067 Certifies that the change in the type design for the following product with the limilations and conditions shovefor as specifed hereon meets the sinvonthiones requiremonts of Poot 3 of the CIVIl Air Rogulations Original Product - TypoContificato Numbon: ABEA Make: Piper Model: PA-31T Description of Type Design Change:

Installation of S-TEC System 65 Two Axis Automatic Flight Guidance System, Model ST-574, according to Bulletin No. 674, dated 4-28-95 and Master Drawing List No.

92781, dated 4-28-95 with Optional Flight Director/Steering Horizon or later FAA Approved revisions of the above data (28 Volt System).

1. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891168, dated 5-26-95 is required for Piper Model PA-31T or later FAA Approved revisions of the above supplement.

2. Compatibility of this modification with other previously approved modifications must be determined by the installer.

Thomas (Title)

FAA Foes 8110-2 (10-68)

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) (Frint or type) (Address of grantor) (Number & street) (City, State, and 2TP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- May 26, 1995: Issued, Current. [certificate](https://openairdocs.org/files/sha256/20/ea/20eafde8b858b6bb05b6adf6276618e4fb6d9b6f24bff5fb3abaca0a7e8f397b)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.