# STC SA6056SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC yaw damper system Model ST-345.
- Applied: January 24, 1986
- Status date: August 20, 1991
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- Certificate PDF: https://openairdocs.org/files/sha256/db/ea/dbeaada5734b78a9c56073fa2fa84f80824dc5daf513fff249f0d049640dd7ef
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E7E20C5636D6381A85256CC200569E38.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA6056SW-D

## ADs that name it (0)

None.

## Approved models (6)

- Textron Aviation Inc. 401 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Textron Aviation Inc. 401A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Textron Aviation Inc. 401B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Textron Aviation Inc. 402A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Textron Aviation Inc. 402B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Textron Aviation Inc. 402C ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))

## 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.

find £00 Bepartment of Transportation—federal Station administration Supplemental t^pe Certificate SA6056SW-D S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, Texas 76067 *"yy* "'"'?r ^ff" VPr <J*Tf- /tmi{afii*^-t- f** ffi*i"MiJ*4A- Civil Air A7CE Cessna 401, 401A, 401B, 402A, 402B, and 402C Installation of S-TEC Yaw Damper System, Model ST-345, according to Bulletin No. 445, Revision 3, dated 8-08-91 and Master Drawing List No. 92364, Revision C, dated 8-08-91 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 89657, dated 2-18-86 is required for Cessna Model 402C and/or later FAA Approved revisions of the above supplement.

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

1-24-86 2-18-86 *~iu~J: 10-23-86, 2-10-89, 8-20-91, Revision 3 (Signaling) William J. Tfiomas DAS Staff Coordinator, DAS 5 SW (Title)

TMii artifieale may tt transferriJ tit atnrJanet with FAR 21.17.

»AA POM •! IO-2 (IO-M)

Uraod Statn of 3amn Bepartmcnt of transportation— .federal Station Administration Supplemental t^gpe Certificate(Condnoation .Sheet) SA6056SW-D, Revision 3 Limitations and Conditions (con't.)

2. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89814, dated 2-10-89 is required for Cessna Models 401, 401A, and 401B and/or later FAA Approved revisions of the above supplement.

3. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89938, dated 8-20-91 is required for Cessna Models 402A and 402B and/or later FAA Approved revisions of the above supplement.

4. Compatibility of this modification with other previously approved modifications must be determined by the installer.

I'D alteration of this certificate is punishable by a fine of not exceeding 11,000, or imprisonment not exceeding 3 years, or FORM «ito-2-l (1O-W T/iit tiHiftati may at trantftTTfj in accordant! with I-'Alt .'/.•/" PAGE 2 OF 2 PAGES

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee).

(Address of transferee). ( Xtunbtr tnii strut) ( City. Slalt, mini ^1P axti j from (Name of grantor) (Print or type).

(Address of grantor) (Xumber **J Uriel j (City. SlfU, Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

A ii < r. o o i«««-««»-n«O

## Every issue (1)

- August 20, 1991: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/db/ea/dbeaada5734b78a9c56073fa2fa84f80824dc5daf513fff249f0d049640dd7ef)

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