# STC SA3181SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell Automatic Flight System Model AK421 consisting of Century
IIB Autopilot with Optional Radio Coupler
- Applied: January 28, 1977
- Status date: June 18, 1984
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A13CE](https://openairdocs.org/tcds/A13CE)
- Certificate PDF: https://openairdocs.org/files/sha256/2f/ae/2fae9f3e306ba4ed06657ae0566281c00c806b5bb7d933de15f305e248f51675
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A80EBAA10E59924785256CC2000A94E9.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3181SW-D

## ADs that name it (0)

None.

## Approved models (3)

- Textron Aviation Inc. 177 ([TCDS A13CE](https://openairdocs.org/tcds/A13CE))
- Textron Aviation Inc. 177A ([TCDS A13CE](https://openairdocs.org/tcds/A13CE))
- Textron Aviation Inc. 177B ([TCDS A13CE](https://openairdocs.org/tcds/A13CE))

## 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.

Btpartmcnt of transportation —Jptderal 3toiation administration Supplemental 'Cgpe Certificate SA3181SW-D Century Flight Systems, Inc.

P.M. 1195 P. 0. Box 610 Mineral Wells, TX 76067 Jte.JHfa-dcA*;gw^^J^^o&c^^ 23 Federal Aviation ^slfaii/a/i&nA.

IZkiaj/na/ iJiwcuud —— • A13CE Cessna 177, 177A, 177B Installation of Mitchell Automatic Flight System Model AK421 consisting of Century IIB Autopilot with Optional Radio Coupler according to Bulletin No. 544, Revision 2, dated 1-27-77 and Master Drawing List No. 87A653, Revision B, dated 1-27-77.

Also eligible on Cessna Model 177 when modified in accordance with STC SA906CE. FAA/DAS Approved Supplemental Flight Manual, P/N 68S503, dated 2-22-77 for Cessna Models 177, 177A and Cessna Model 1778, S/N 17701371 thru S/N 17702313 and Cessna Model 177 when modified in accordance with STC SA906CE.

FAA/DAS Approved Pilot's Operating Handbook Supplement, P/N 68S505, dated 2-22-77, for Cessna Model 177B, S/N 17702314 and up.

J^ab|bSig?»?feShi? ???aSSi?SrT±th °ther Previously *PP-ved modifications<Jfa&'Ge&tyfuMZe'stvnd'Jn* Atjf>fi-(fr/^nydata Mtfac/i *& &lf /-aJcJ jfr-^jrfJiwifatjJiadf/rf'rnmsn- vnssj&ff/Mw/i'/AMrfit>n-Jeb&^'*>£n4rwt^^£aMiAA6e/d-u<4A£ 6-18-84, Revision 1

• /'< Don P. Watson Manager, Aircraft Certification Division Southwest Region (Title)

This certificate may be transferred in accordance with FAR 21.17- FAA Fou> tl 10-2 (10-68)

. Office of i he transfer of this Supplemental Type Certificate.

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

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) _ (Address of transferee) __ I Mumttr md ttrtti) (Ctly.Statt. **d ZI from (Name of grantor) (Print or type).

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

Signature of grantor (In ink):

## Every issue (1)

- June 18, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/2f/ae/2fae9f3e306ba4ed06657ae0566281c00c806b5bb7d933de15f305e248f51675)

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