# STC SA3111SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell Yaw Damper System Model YK580
- Applied: February 6, 1976
- Status date: May 24, 1984
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- Certificate PDF: https://openairdocs.org/files/sha256/7c/ce/7cce49b3909171e8353392df207b9d3e8b52ef865e3161318185dafa65d8febd
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/60582588B07C3AD585256CC2000A93F6.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3111SW-D

## ADs that name it (0)

None.

## Approved models (2)

- Cessna Aircraft Company 414A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421C ([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.

department of transportation ^federal atriation administration Supplemental 'Cgpe Certificate SA3111SW-D Century Flight Systems, Inc.

P.M. 1195 P. 0. Box 610 Mineral Wells, TX 76067 fc^JA&Jcittc^^ Civil Air </l£a4tZa/4*>nA.

CJruM/rva/' \Jroeutf6 —— <s*

•/rtaM4i*e>m&n A7CE Cessna 414A, 421C Installation of Mitchell Yaw Damper System Model YK580 according to Bulletin No. 704, Revision 1, dated 7-7-78 and Master Drawing List No. 87A829, Revision A, dated 7-7-78 (28 Volt System) and/or later FAA Approved Revisions of the above data.

FAA/DAS Approved Pilot's Operating Handbook Supplement, P/N 68S332, dated 2-17-76 is required for Cessna Model 421C FAA/DAS Approved Pilot's Operating Handbook Supplemept, P/N 68S733, dated 8-4-78 is required for Cessna Model 414A and/or later FAA Approved Revisions of theove s.up.plements .

°ther ^^——^ approved modifications /e<*ivtt'ri4i&0w4M& f+tsi* 8-4-78 5-24-84, Revision 2 a£r atrirtisfter :

Don P. Watson Manager, Aircraft Certification Division Southwest Region ( Title )

17.

.NSTRUCTIONS: The transfer end————n, be,———.y be used to notify the appropriate FAA Kepona. Office of the transfer of this Supplemental Type Certificate.

The FAA will reissue the certificate in the name of the transferee and forward it to him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemenul Type Certificate Number to (Name of transferee)__ (Address of transferee) ___ (Mumttr mlttr«t) from (Name of grantor) (Print or type).

(Address of grantor) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- May 24, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/7c/ce/7cce49b3909171e8353392df207b9d3e8b52ef865e3161318185dafa65d8febd)

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