# STC SA3057SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system Model AK438 consisting of Century IV autopilot or AK438FD consisting of Century IV flight director autopilot with optional remote annuciator.
- Applied: June 2, 1975
- Status date: August 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/f2/74/f274be79a3fae100ec0e46e1441a42981ce7743c1d567fe3d06e0ec5fe6fd572
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4ADA705593FF9BC385256CC2000A933D.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3057SW-D

## ADs that name it (0)

None.

## Approved models (6)

- Cessna Aircraft Company 401 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 401A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 401B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

Hotel States of Sacrica Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA30575W-D This certificate issued to: Century F11ght Systems, InC.

F.M. 1195 P.O. Box 610 Mineral Wells, TX 76067 Part 3 of the CIVII Air Regulations.

Original Product - Typebertificate Numben: ATCE Make: Cessna Model: 401, 401A, 401B, 402, 402A, 402B Description of Type Design Change:

Installation of Mitchell Automatic Flight System Model AK438, consisting of Century IV Autopilot or AK438FD consisting of Century IV Flight Director Autopilot with Optional Remote Annunciator according to Bulletin No. 560, Revision 3, dated 9-22-76 and Master Drawing List No. 87A792, Revision C, dated 9-22-76.

Limitations and Conditions: FAA/DAS Approved Airplane Flight Manual Supplement, P/N 68S256-2, dated 10-22-76 is required for Cessna Models 401, 401A, 401B, 402 and 402A. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 685434, dated 10-22-76 is required for Cessna Model 402B, Placard P/N 13A660 1s required, Compatibility of this modification with other previously approved modifications must be determined by the installer 6-2-75 Date Reissued: 7-22-76; 10-22-76; 8-16-84, Revision 3 Date of Issuance: 6-12-75 Date Amended: .

**FEDERAL AVIATION**

•Don P. Watson (Signature) TONIN STRATO Manager, Aircraft Certification Division Southwest Region (Talle)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) - (Address of transferee) (Yumber and streel) (City, Stake, and RIP rode) from (Name of grantor) (Print or type) .._ (Address of grantor) (posts pur sequent) (City, State, and ZIP codes Extent of Authority (if licensing agreement):

Signature of grantor (In int): -

## Every issue (1)

- August 16, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/f2/74/f274be79a3fae100ec0e46e1441a42981ce7743c1d567fe3d06e0ec5fe6fd572)

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