# STC SA3110SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell Automatic Flight System Model AK579,
- Applied: February 6, 1976
- Status date: May 24, 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/sha256/00/2d/002d21dd3f52cb84f603031dca126683cf494b38764fedef029b284d4fff9e42
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EEB53D32EC1E489B85256CC2000A93F3.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3110SW-D

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 421C ([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.

Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA31105W-D This certificate issued to: Century Flight Systems, Inc.

F.M. 1195 P. O. Box 610 Mineral Wells, TX 76067 Part 3 of the CIV11 Air Regulations:

Original Product - Type Certificate Number: A7CE Make: Cessna Model: 421C Description of Type Design Change:

Installation of Mitchell Automatic Flight System Model AK579, consisting of Century IV Autopilot or Model AK579FD, consisting of Century IV Flight Director Autopilot with Optional Remote Annunciator according to Bulletin No. 703, Revision 1, dated 7-9-76 and Master Drawing List No. 87A839, Revision A, dated 7-9-76.

FAA/DAS Approved Pilot's Operating Handbook Supplement, P/N 685333-1, dated 8-13-76 is required.

Placard, P/N 13A660-1 is required.

Thist bleatend the suppertiny date which is the basis fun appr val shull remain in effel until sur- Compatibility of this modification with other previously approved modifications determined by the vendered, suspended, nevoked, or a lermination date is otherwise es lablished by the Adminis tral, r of the Federal Aviation Administration .

8-13-76 Date of Application: 2-6-76 Jute missued: 5-24-84, Revision 2 Date of Issuance: 2-17-76 Jale mended:

FEDERAL AVIATION By Direction of the Administrator Don P. Watson ( Signalure ) TOMINIST RANO Manager, Aircraft Certification Division Southwest Region (Title)

47.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) - (Number and street) (City, Stake, and 2IP code) from (Name of grantor) (Print or type) _ (Address of grantor) / Number and sireel ;

(City, Stale, and ZIP code, Extent of Authority (if licensing agreement):

Signature of grantor (In ink): -

## Every issue (1)

- May 24, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/00/2d/002d21dd3f52cb84f603031dca126683cf494b38764fedef029b284d4fff9e42)

---
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.