# STC SA3117SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system Model 328 consisting of Century I Autopilot with Optional Omni Tracker
- Applied: March 2, 1976
- Status date: June 5, 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/d1/72/d172db7d68b96c58226f7fbc133a78cf907d63cf7eddd02f1b07a1d991ad86a0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2B6CBDFD5D6FF36A85256CC2000A9408.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3117SW-D

## ADs that name it (0)

None.

## Approved models (10)

- 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))
- Beechcraft Corporation S35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation V35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation V35A ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation V35B ([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.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number S131175W-D This certificate issued to: . Century Flight Systems, INCi F.M. 1195 P.O. Box 610 Mineral Wells, Texas 76067 Part 3 sf the CIVII. Air Regulations.

Eniginal Freduct - Type Tientificate Numben: 3A15 Make: Beech Model: H35, J35, K35, M35, N35, P35, $35, V35, V35A, V35B Description of Type Design Change:

Installation of Mitchell Automatic Flight System Model 328 consisting of Century I Autopilot with Optional Omni Tracker according to Bulletin No. 440, Rev. 12, dated 8-15-78, and Master Drawing List No, 87A337, Rev. H, dated 8-15-/8 (14 Volt) and/or later FAA Approved revisions of the above data.

finitalünsandlendilins: The following Airplane Flight Manual Supplenents are required for those aircraft having Airplane Flight Manuals and autopilots without interrupt:

P/N 685736, dated 8-15-78 for Beech Models J35, K35, M35, N35, P35, S35 P/N 68S737, dated 8-15-78 for Beech Model V35 P/N 68S738, dated 8-15-78 for Beech Models V35A, V35B P/N 68S739, dated 8-15-78 for Beech Model H35 See Continuation Sheet, page 2, a part of this STC.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

Date of Application: 3-2-76 Date Reissued: 8-15-78; 6-5-84, Rev. 2 Date of Issuance: 3-16-76 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Jun (Signature) 1OMIN PION W1111am I. Johns DAS Staff Coordinator _DAS 7 (Title)

47.

**FAX FORM 6110-2 (10-00)**

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Shect) Number: SA3117SW-D, REv. 2, ded. 6-5-84 Limitations and Conditions: ' (Cont'd):

The following Airplane Flight Manual Supplements are required for those Aircraft having Airplane Flight Manuals and autopilots with interrupt:.

P/N 685742, dated 8-15-78 for Beech Models J35, K35, M35, N35, P35, S35 P/N 68S743, dated 8-15-78 for Beech Model V35 P/N 685744, dated 8-15-78 for Beech Models V35A, V35B P/N 68S745, dated 8-15-78 for Beech Model H35 The following Pilot's Operating Handbook and FAA/DAS Approved Airplane Flight Manual Supplenents are required for those aircraft having a Pilot's Operating Handbook and autopilots without interrupt:

P/N 685748, dated 8-15-78 for Beech Models J35, K35, M35, N35, P35, S35 P/N 68S749, dated 8-15-78 for Beech Model V35 P/N 68S750, dated 8-15-78 for Beech Models V35A, V35B P/N 68S751, dated 8-15-78 for Beech Model H35 The following Pilot's Operating Handbook and FAA/DAS Approved Airplane Flight Manual Supplement are required for those aircraft having a Pilot's Operating Handbook and autopilots with interrupt:

P/N 685754, dal: 1 8-15-78 for Beech Models J35, K35, M35, N35, P35, 535 P/N 68S755, dated 8-15-78 for Beech Model V35 P/N 68S756, dated 8-15-78 for Beech Models V35A, V35B P/N 68S757, dated 8-15-78 for Beech Model H35 and/or later FAA Approved revisions of the above data.

47.

## Every issue (1)

- June 5, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d1/72/d172db7d68b96c58226f7fbc133a78cf907d63cf7eddd02f1b07a1d991ad86a0)

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