# STC SA09165AC-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC yaw damper system, Model ST-529.
- Applied: September 13, 1996
- Status date: September 18, 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/fa/38/fa3878f0b1004094b591a175a697be7de987bec9c88a78b772441b53ffc01fe4
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A6A91EBDEBE5EF9185256CC1007F39FB.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09165AC-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.

*Enicol Scares al Sacrica Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SA09165AC-D This certificate issued to: S-TEC Corporation 946 Pegram Mineral Wells, TX 76067 codifies that the shange in the lyre desiger for the following product with the limilalions and conditions shamefor ss specifed heron meels the sinuonthiness requirements of Port 3 af the CIVIl Air Regulations Original Product -TypoContificato Numbor: 6A1 Make: Twin Commander Model: 560-A and 560-E Description of Type Design Change:

Installation of S-TEC Yaw Damper System, Model ST-529, according to Bulletin No.

629, Revision 1, dated 9-11-96 and Master Drawing List No. 92677, Revision A, dated 9-11-96 or later FAA Approved revisions of the above data (28 Volt System).

1. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 891270, dated 9-18-96 is required for Twin Commander Models 560-A and 560-E 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.

The FAA will reissue the certificate in the name of the transferee and forwatd 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 code) 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)

- September 18, 1996: Issued, Current. [certificate](https://openairdocs.org/files/sha256/fa/38/fa3878f0b1004094b591a175a697be7de987bec9c88a78b772441b53ffc01fe4)

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