# STC SA7177SW-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC yaw damper system, Model ST-436.
- Applied: May 17, 1988
- Status date: June 27, 1988
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A3](https://openairdocs.org/tcds/2A3)
- Certificate PDF: https://openairdocs.org/files/sha256/3d/f5/3df54b9d9d70455c134df075f642616fdee01b801baacc485cbcacc8ba1a2643
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/86207D350AE0D4B085256CC20056A1D8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA7177SW-D

## ADs that name it (0)

None.

## Approved models (1)

- Mooney Aircraft Corporation M20L ([TCDS 2A3](https://openairdocs.org/tcds/2A3))

## 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: SA71775W-0 This certificate issued to: S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, Texas 76067 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meets the airvorthiness reguirements of Part 3 of the CiViI Air Regulations:

Original Product -Type Certificate Number: 2A3 Make: Mooney Model: M20L Description of Type Design Change:

Installation of S-TEC Yaw Damper System, Model ST-436, according to Bulletin No. 536, dated 5-13-88 and Master Drawing List No. 92473, dated 5-13-88 and/or later FAA Approved revisions of the above data (28 Volt System).

1. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89783, dated 6-27-88 is required and/or later FAA Approved revisions of the above supplement.

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

Date of Application: 5-17-88 Date Reissued:

Date of Issuance: 6-27-88 Date Amended:

EDERAL AVIATION By Direction of the Administrator Thral H Tabletsman (Signature) TOMINISTRA ON Harold W. Holdeman DAS Staff Coordinator, DAS 5 SW (Tille)

47.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and Z1P code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and Z1P code) Exent of Authority (if licensing agreement) :

Signature of grantor (In ink) :

## Every issue (1)

- June 27, 1988: Issued, Current. [certificate](https://openairdocs.org/files/sha256/3d/f5/3df54b9d9d70455c134df075f642616fdee01b801baacc485cbcacc8ba1a2643)

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