# STC SA637SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system Model AK209 consisting of Century III autopilot with optional automatic pitch trim, automatic aileron stabilizer and radio coupler.
- Applied: April 15, 1966
- Status date: June 25, 1984
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A21](https://openairdocs.org/tcds/3A21)
- Certificate PDF: https://openairdocs.org/files/sha256/29/df/29df5ab2193c17b0fa1326444f095c9667c1fae154b8e3c28413b7480fc8ded5
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BEE4965AC87B42E785256CC200569F39.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA637SW

## ADs that name it (1)

- [AD 70-15-18](https://openairdocs.org/ad/70-15-18): Automatic Pilot and Automatic Aileron Stabilizer Instruments · Mitchell Industries Auto Pilot Systems Instruments. Effective Aug 31, 1970. Cited in the text

## Approved models (2)

- The Cessna Aircraft Company 210F ([TCDS 3A21](https://openairdocs.org/tcds/3A21))
- The Cessna Aircraft Company T210F ([TCDS 3A21](https://openairdocs.org/tcds/3A21))

## 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.

Bepartment of ^transportation —federal 2toiation administration Supplemental t^pe Certificate ^flfaufaAfnA:

thtainad tJi SA637SW Century Flight Systems, Inc.

P.M. 1195 P. 0. Box 610 Mineral Wells, TX 76067 JfoJ'pfadeJMjaw^^JA^fttbitfi^ .^^ 3 Civil Air 3A21 Cessna 210F and T210F Installation of Mitchell Automatic Flight System Model AK2CT9 ftmsistfog of Mitchell Century III Autopilot with Optional Automatic Pitch Trim, Automatic Aileron Stabilizer and Radio Coupler according to Bulletin No. 318, Revision 1, dated 3-12-70 and installation of Mitchell Radio Coupler Model 1C388-3 per Bulletin No. 611, Revision 1, dated 4-16-74 and Master Drawing List No. 87A708 dated 4-16-74.

1. Mitchell Industries, Inc. FAA Approved Placard 13A329-209 required with Century III installation,

2. Mitchell Industries, Inc. FAA Approved Placard 13A343-209 required with Stabilizer installation.

3. FAA Approved Autopilot Flight Manual Supplement, P/N 68S168, dated 4-16-74 is required for Radio Coupler Model 1C388-3.nr»at'iH'ili+-^T r^f #-1*-!^ «.^^]jf^_«A.^__ __•»! .< : April 15, 1966 May 4, 1966 4-16-74; 6-25-84, Revision 2 ./.ussftrectiw * Don P. Watson Manager, Aircraft Certif icatioji Division Southwest Region (Titli)

FAAFcxtM 8 It 0-2(10-68)

1 INSTRUCTIONS: The transferrndortcmrnl below may be used to notify the appropriate FAA Regional Office of the transfer of thu 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 Supplemental Type Certificate Number .

to (Name of transferee).

(Address of transferee). (XitmbtrmJ Oral) (City. Slate, fnJ ^IP nxte I from (Name of grantor) (Print or type).

(Address of grantor) I \umlxi titJ Urttlj (Citr. SUU.

Signature of grantor (In ink):

## Every issue (1)

- June 25, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/29/df/29df5ab2193c17b0fa1326444f095c9667c1fae154b8e3c28413b7480fc8ded5)

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