# STC SA09162AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 40/50 single and two axis automatic flight guidance systems, Model ST-634-40/50.
- Applied: August 12, 1996
- Status date: September 6, 1996
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 6A1](https://openairdocs.org/tcds/6A1)
- Certificate PDF: https://openairdocs.org/files/sha256/ad/d4/add4f4d56c60d613205d56b4b968378f753967e6e9cfc7f087f3c73a29fa2afa
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D15530184ED880DE85256CC1007F39F8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09162AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Twin Commander Aircraft LLC 560-A ([TCDS 6A1](https://openairdocs.org/tcds/6A1))
- Twin Commander Aircraft LLC 560-E ([TCDS 6A1](https://openairdocs.org/tcds/6A1))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

Enical States of Suerica Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA09162AC-D This certificate issued to: S-TEC Corporation 946 Pegram Mineral Wells, Texas 76067 Port 3 of the CIVIl Air Regulations Original Product - Type Contificate Number: 6A1 Make: Twin Commander Model: 560-A and 560-E Description of Type Design Change:

Installation of S-TEC System 40/50 Single and Two Axis Automatic Flight Guidance Systems, Model ST-634-40/50, according to Bulletin No. /34, dated 8-09-96 and Master Drawing List No. 92946, dated 8-09-96 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 891293, dated 8-16-96 is required for Twin Commander Models 560-A and 560-E for S-TEC System 40 or later FAA Approved revisions of the above supplement.

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

Thomas (Title)

FAA Foss 8110-2 (10-68)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09162AC-D, Revision 1 Limitations and Conditions: (con't.)

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891294, dated 8-16-96 is required for Twin Commander Models 560-A and 560-E for S-TEC System 50 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.

**47 PAGE 2 OF 2 PAGES**

INSTRUCTIONS: The transfer endorsenent below may be used to notify the appropriate FAA Regional Office of the transfer of the Supplemental Type Certificate.

The FAA will reissue the certificate in the name of the transfeter and forward it to 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, Stats, and 2TP codel Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- September 6, 1996: Amended, Current. [certificate](https://openairdocs.org/files/sha256/ad/d4/add4f4d56c60d613205d56b4b968378f753967e6e9cfc7f087f3c73a29fa2afa)

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