# STC SA3250SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Instatllation of Mitchell automatic flight system model AK404 consisting of Century IIB autopilot with optional radio couplers.
- Applied: October 3, 1977
- Status date: August 12, 1993
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A6CE](https://openairdocs.org/tcds/A6CE)
- Certificate PDF: https://openairdocs.org/files/sha256/1e/0e/1e0e39f3377c0f52e5007bdc1435eba1119d8d406997aea085cfb32e6ed61f68
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A52D087FB6339C9E86257DA80064CA2A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3250SW-D

## ADs that name it (0)

None.

## Approved models (7)

- Cessna Aircraft Company 337 ([TCDS A6CE](https://openairdocs.org/tcds/A6CE))
- Cessna Aircraft Company 337A ([TCDS A6CE](https://openairdocs.org/tcds/A6CE))
- Cessna Aircraft Company 337B ([TCDS A6CE](https://openairdocs.org/tcds/A6CE))
- Cessna Aircraft Company 337C ([TCDS A6CE](https://openairdocs.org/tcds/A6CE))
- Cessna Aircraft Company 337D ([TCDS A6CE](https://openairdocs.org/tcds/A6CE))
- Cessna Aircraft Company T337B ([TCDS A6CE](https://openairdocs.org/tcds/A6CE))
- Cessna Aircraft Company T337C ([TCDS A6CE](https://openairdocs.org/tcds/A6CE))

## 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.

Dnittd $tatu of amrrica department of transportation— federal Htriation Administration Supplemental 'Cgpe Certificate SA3250SW-D isl&futa<(u>nA/.

Century Flight Systems, Inc P.M. 1195 P.O. Box 610 Mineral Wells, Texas 76068 /^^Si^^^^rfSii^^ _ . . , _ . .

**A6CE CESSNA 337, 337A, 337B, T337B, 337C, T337C, AND 337D.**

j£>/ Installation of a Century Automatic Flight System, Model AK404 consisting of a Century IIB Autopilot with Optional Radio Couplers according to Bulletin No.

527, dated 06-03-74, Rev. 4 dated 08-09-93 and Master Drawing List No. 87A631 dated 06-03-74, Revision D dated 08-09-93 (28 Volt System) or later FAA/DASApproved revision.

FAA/DAS Approved Supplemental Flight Manual, P/N 68S576 Dated 11-02-77, Rev. 1dated 08-09-93 Compatibility of this modification with other previously approved modifications must be determined by the installer.

-u/ 10-03-77 "-02-77 ^.

03_28-84 Rev. 1 08-12-93 Rev. 1 (Signature) Trudy Wallace DAS Staff Coordinator DAS 7 sw (Title)

FAAFotM 8110-2(10-68)

,NSTRUCTIONS: The transfer endowment below may be used ,o notify the appropriate FAA Regional Office of the transfer of thU Supplemental Type Certificate.

The FAA will remue the certificate in the name of the tramferee and forward it to him.

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

(Address of transferee) _ from (Name of grantor) (Print or type).

(Address of grantor) (Xumkf *n<l ttrtttj Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

, ii < r. o n i«•• -««»•"»«

## Every issue (1)

- August 12, 1993: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/1e/0e/1e0e39f3377c0f52e5007bdc1435eba1119d8d406997aea085cfb32e6ed61f68)

---
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.