# STC SA5328SW-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC yaw damper system, model ST-251.
- Applied: June 4, 1984
- Status date: August 1, 1984
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1A10](https://openairdocs.org/tcds/1A10)
- Certificate PDF: https://openairdocs.org/files/sha256/56/ec/56ec3cd09d59dc87b6df44d927d931b9e5617da3defae03f31d72507ba264d39
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/313995A5246F05A985256CC200122868.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA5328SW-D

## ADs that name it (0)

None.

## Approved models (2)

- Piper Aircraft Inc. PA-23-250 ([TCDS 1A10](https://openairdocs.org/tcds/1A10))
- Piper Aircraft Inc. PA-E23-250 ([TCDS 1A10](https://openairdocs.org/tcds/1A10))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

ltaM Hiritri States of ararrita Bepartmtnt of 'Crausportation— Jpcdtral 2toiation administration Supplemental 'Cgpe Certificate i/u&mver' SA5328SW-D S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, TX 76067 *fcta*a1U4 1A10 PIPER PA-23-250 AND PA-E23-250 ClVll Air i/um *x ^/.-ufie —£ ^e&ian Installation of S-TEC Yaw Damper System, Model ST-251, according to Bulletin No.

351, Revision 1, dated 7-20-84 and Master Drawing List No, 92280, Revision A, dated 7-20-84 and/or later FAA Approved revisions of the above data (14 Volt System).

1. Eligible only on Piper Models PA-23-250 and PA-E23-250, S/N 27-2000 thorugh S/N 27-7554172.

2. Also eligible on the above models when equipped with Approved Turbocharged Engines (250 H.P.) and/or Wing Tip Tanks per STC SA1480WE.

CqatinuaUon Sheet, Page 2, a part of this STC)<yt£&teMna^/i*-A4jstsi&^4M^jza/&Mjfu4WJ&Jf/i&&iA^'J^ ^e^7ntna£M^ £xdm&ni&£ra£e>r-,€&4&0 8-1-84, Revision 16-04-84 6-27~84 (Signature) Harold W. Holdeman DAS Staff Coordinator, DAS 5 SW (Title)———————— ___ ___ __ \ *----/___

FAAFo«* 8110-2(10-48)

Unitrd Starts of SLntnra Bepartment of tensportation— federal Station administration Supplemental t:gpe Certificate(Continuation £heet) SA5328SW-D, Revision 1 Limitations and Conditions (con't) 3 FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89474, dated 6-27-84 is required for Piper Models PA-23-250 and PA-E23-250, S/N 27-2000 through S/N 27-7554172 and the above models when equipped with Approved Turbocharged Engines (250 H.P.) and/or later FAA Approved revisions of the above supplement.

4. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89474-1, dated 8-1-84 is required for Piper Models PA-23-250 and PA-E23-250, S/N 27-2000 through S/N 27-7554172 and the above models when equipped with approved Turbocharged Engines (250 H.P.) and/or Wing Tip Tanks per STC SA1480WE and/or later FAA Approved revisions of the above supplement.

5. Compatability of this modification with other previously approved modifications must be determined by the installer, . I' ; :il(fin>inn oj this certificate is punishable by a fine of not exceeding 51,000, or imprisonment not exceeding 3 years, nr />o/A <AA FORM 8MU-2-I (10-69) This certificate may be trans/trrtci in accordance ii'ilh I'AR ;.'/.•/."" PAGE 2 OF 2

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number .

to (Name of transferee) (Address of transferee) (Number and street) (City, Slate, and <7P cade) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and QP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

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

## Every issue (1)

- August 1, 1984: Amended, Current. [certificate](https://openairdocs.org/files/sha256/56/ec/56ec3cd09d59dc87b6df44d927d931b9e5617da3defae03f31d72507ba264d39)

---
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.