# STC SA3139SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell Automatic Flight System Model AK613 consisting of Century IIB Autopilot with Optional Radio Coupler.
- Applied: May 10, 1976
- Status date: June 6, 1984
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 5A4](https://openairdocs.org/tcds/5A4)
- Certificate PDF: https://openairdocs.org/files/sha256/b9/f9/b9f9ce9c5d236ea6cfecdb8fec0092b0076c95c16875b910b5ff8629f030226d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5F3388C381819C5785256CC2000A945B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3139SW-D

## ADs that name it (0)

None.

## Approved models (5)

- Beechcraft Corporation D50 ([TCDS 5A4](https://openairdocs.org/tcds/5A4))
- Beechcraft Corporation D50A ([TCDS 5A4](https://openairdocs.org/tcds/5A4))
- Beechcraft Corporation D50B ([TCDS 5A4](https://openairdocs.org/tcds/5A4))
- Beechcraft Corporation D50C ([TCDS 5A4](https://openairdocs.org/tcds/5A4))
- Beechcraft Corporation D50E ([TCDS 5A4](https://openairdocs.org/tcds/5A4))

## 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: SA31395W-D This certificate issued to: Century Flight Systems, Inc.

F.M. 1195 P. O. Box 610 Mineral Wells, TX 76067 Purt 3 of the CIVI1 Air Regulations Original Product - Type bertificate Number: 5A4 Make: Beech Model: D50, D5OA, D5OB, D50C, and D5OE Desomplion of Type Design Pahange:

Installation of Mitchell Automatic Flight System Model AK613 consisting of Century IIB Autopilot with Optional Radio Coupler according to Bulletin No. 739, Revision 1, dated 1-6-77 and Master Drawing List No. 87A862, Revision A, dated 1-6-77.

tirnitalions and binditions:

FAA/DAS Approved Airplane Flight Manual Supplement, P/N 68S382, dated 5-17-76 1s required.

Compatibility of this modification with other previously approved modifications

Date of Application: 5-10-76 Juke missued: 1-27-77; 6-6-84, Revision 2 Date of Issuance: 5-17-76 Sale umended:

EDERAL AVIATION By Direction of the Administrator Don P. Watson (Signalure) PAINISTRAL DR Manager, Aircraft Certification Division Southwest Region (Title) 47 FAA FORM 8110-2 (10-68)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee).

(Address of transferee) (Number and streel) (City, Stake, and 2IP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and sireel;

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

Date of Transfer: _ Signature of grantor (In ink):

+.. = r. On. 1090-452-180

## Every issue (1)

- June 6, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b9/f9/b9f9ce9c5d236ea6cfecdb8fec0092b0076c95c16875b910b5ff8629f030226d)

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