# STC SA1668SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system Model AK407, consisting of Century IV autopilot with trim; or AK407/FD consisting of Century IV autopilot/ flight director with trim.
- Applied: April 30, 1973
- Status date: July 16, 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/sha256/62/7d/627d9be6cf8ab9982d7e0e3f183f29faa166c63bac6546b0b95f193dd56109c5
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/341993A30CA7220485256CC10083CE8C.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1668SW

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 421B ([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.

Bepartmcnt of transportation —jfederal Stoiation administration Supplemental i:gpe Certificate <yu#m>v€4t' SA1668SW tStegtita&n- Century Flight Systems, Inc.

P.M. 1195 P. 0. Box 610 Mineral Wells, TX 76067 Civil Alr A7CE Cessna 421B rtat> :

Installation of Mitchell Automatic Flight System Model AK407 consisting of Century IV Autopilot with Trim, or AK407/FD consisting of Century IV Autopilot/ Flight Director with Trim according to Bulletin No. 530 dated 4-15-73 and Master Drawing List 87A661 dated 4-27-73.

FAA Approved Airplane Flight Manual Supplement dated May 30, 1973, is required for Century IV Autopilot; or Supplement dated May 30, 1973, for Century IV Flight Director Autopilot System.

>y April 30, 1973 May 30, 1973 7-16-84, Revision 1 (f It t/tf Hftttf - Don P. Watson Manager, Aircraft Certification Division Southwest Region fruit)

This cirlificalt may br tmrufriitd in acto'denie with hAR 21 17

INSTRUCTIONS. The transfer endorsement below may he used 10 notify ihc appropriate FAA Regional Office of I he 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 Supplemental Type Certificate Number _ to (Name of transferee) (Address of transferee) (Number arid Ifrfft) (City, Slab. a.

from (Name of grantor) (Print or type) (Address of grantor) t tfumbtr and it'ttt) I City, Slalr, a Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

**C FAA AC 69-5536**

## Every issue (1)

- July 16, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/62/7d/627d9be6cf8ab9982d7e0e3f183f29faa166c63bac6546b0b95f193dd56109c5)

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