# STC SA3270SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system model AK728 consisting of Century IV autopilot or AK728FD consisting of Century IV flight director autopilot with optional remote annunciator.
- Applied: February 1, 1978
- Status date: March 28, 1984
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A15](https://openairdocs.org/tcds/3A15)
- Certificate PDF: https://openairdocs.org/files/sha256/a2/bf/a2bfa24de7c7fa18ab844dccb40c72414f604b3e455f13b8917690ebdad6467b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7C8F55CC03B245A286257DB1005A4723.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3270SW-D

## ADs that name it (0)

None.

## Approved models (6)

- Beechcraft Corporation H35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation J35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation K35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation M35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation N35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation P35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))

## 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: SA327054-D This certificate issued to: Century Flight Systems, Inc.

F.M. 1195 P. O. Box 610 Mineral Wells, TX 76067 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meets the airvorthiness requivements of Part 3 of the C1V11 AIT Regulations.

Original Product - Type bertificate Number: 3A15 Make: Beech Model: H35, J35, K35, M35, N35, P35 Description of Type Design Change:

Installation of Mitchell Automatic Flight System Model AK728 consisting of Century IV Autopilot or AK728FD consisting of Century IV Flight Director Autopilot with Optional Remote Annunciator according to Bulletin No. 863, Rev. 1 dated 3-30-78 and Master Drawing List No. 87A984 Rev. A dated 3-30-78 (14 Volt System), or later FAA approved revision.

Limitations and Conditions: P1lot's Operating Handbook and FAA/DAS Approved A1rplane Flight Manual Supplement P/N 68S680 dated 3-3-78 16 required for Model H35 aircraft owners with a Pilot's Operating Handbook and FAA Approved Airplane Flight Manual;

FAA/DAS Approved Airplane Flight Manual Supplement P/N 68S681 dated 3-3-78 18 required for Model H35 aircraft owners with an Airplane Flight Manual.

**SEE CONTINULTION SHEET, PAGE 2 OF THIS SIC.**

Sea ipal nate sue in date adit in the base for appenal s vendered, suspended, vevoked, or a termination date is othervise established by the Adminis trater of the Federal Aviation Administration .

Date of Application: 2-1-78 Jule missured: 5-23-78; 3-28-84 Rev1810n 2 Date of Issuance: 3-3-78 Sale unended:

FEDERAL AVIATION She Sidninistrat Don P. Watson (Signalure) TOMINI STRANDE Manager, Aircraft Certification Division Southwest Region (Title)

47.

*niczo States of 2lmerica Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Shee+ Number SA3270SW-D Revion 2 Limitations and Conditions: (Cont'd):

Pilot's Operating Handbook and FAA/DAS Approved Airplane Flight Manual Supplement, P/N 68S682, dated 3-3-78 1s required for Beech Models J35, K35, M35, N35, and P35 aircraft owners with a Pilot's Operating Handbook and FAA Approved Airplane Flight Manual FAA/DAS Approved Airplane Flight Manüäl, Supplement, P/N 685683, dated 3-3-78 is required for Beech Models J35, K35, M35, N35, and P35 aircraft owners with an Airplane Flight Manual, and or later FAA Approved revisions of the above supple- Placard, P/N 13A660 is required for owners with an Airplane Flight Manual.

Placard, P/N 13A660-1 is required for owners with a Pilot's Operating Handbook.

47.

**PAGE 2OF 2 PAGES FAA AC 72-4435**

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) _ (Address of transferee) (2301p5 preo sequiry") from (Name of grantor) (Print or type) (Address of grantor) (Number and sireel ;

Signature of grantor (In ink): - + 11 = r. 0 n: 1008-кк9.180

## Every issue (1)

- March 28, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/a2/bf/a2bfa24de7c7fa18ab844dccb40c72414f604b3e455f13b8917690ebdad6467b)

---
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.