# STC SA5394SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC yaw damper system, model ST-320.
- Applied: May 15, 1985
- Status date: October 21, 1986
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A3](https://openairdocs.org/tcds/2A3)
- Certificate PDF: https://openairdocs.org/files/sha256/30/88/3088eca94964fc7db719ff86cfff911171abd3d1e528e7dd48529083f01b2ad4
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/09E64746C5162C3686257EDE0062C78D.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA5394SW-D

## ADs that name it (0)

None.

## Approved models (2)

- Mooney International Corporation M20J ([TCDS 2A3](https://openairdocs.org/tcds/2A3))
- Mooney International Corporation M20K ([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.

amitro Srates of Sumerica Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA53945W-0 This certificate issued to: 11. S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, TX 76067 Part 3 of the CIVil Air Hegulatuns Original Product - Type trentificate Number 2A3 Make: MOONEY Model: M20J AND M20K Description of Type Design Change:

Installation of S-TEC Yaw Damper System, Model ST-320, according to Bulletin No.

420, Revision 2, dated 8-08-86 and Master Drawing List No. 92328, Revision B, dated 8-08-86 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 89603, dated 6-04-85 is required and/or later FAA Approved revisions of the above supplement.

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

Date of Application: 5-15-85 Date Reissued: 10-21-86, Revision 1 Date of Issuance: . 6-04-85 Date Amended:

FEDERAL AVIAT By Direction of the Administrator Harold I Holluman (Signalure ) VOMINISTRATO DAS Staff Coordinator, DAS 5 SW Harold W. Holdeman (Title)

Paniced Stares of sumerica Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA539954-D, Revision 1 Limitations and Conditions: (con't)

2. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89603-1, dated 10-21-86 is required and/or later FAA Approved revisions of the above supplement.

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

**47 PAGE 2 OF 2PAGES**

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 and street) (City, State, and ZIP code ) Extent of Authority (if licensing agreement):

Date of Transfer: - Signature of grantor (In ink):.

U.S. GOVERNMENT PRINTING OFFICE: 1966 OF OF-205-579

## Every issue (1)

- October 21, 1986: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/30/88/3088eca94964fc7db719ff86cfff911171abd3d1e528e7dd48529083f01b2ad4)

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