# STC SA7185SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 60 two axis automatic flight guidance system, Model ST-446, with optional automatic electric trim system.
- Applied: August 10, 1988
- Status date: October 20, 1988
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A15](https://openairdocs.org/tcds/3A15)
- Certificate PDF: https://openairdocs.org/files/sha256/8b/4f/8b4f6a9b2ddb3d130534f72627fc7b2a1f13f55d343c074d4c1208da67754864
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/034F96B96F14517A85256CC20056A1E7.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA7185SW-D

## ADs that name it (0)

None.

## Approved models (2)

- Beechcraft Corporation 35-C33 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation F33C ([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: SA71855W-D This certificate issued to: S-TEC Corporation Rt. 4, BIdg. 946 Wolters Industrial Complex Mineral Wells, Texas 76067 Part 3 of the CIViI Air Regulations.

Original Product -Type bertificate Number: 3A15 Make: Beech Model: 35-C33 and F33C Description of Type Design Change:

Installation of S-TEC System 60 Two Axis Automatic Flight Guidance System, Model ST-446, with Optional Automatic Electric Trim System according to Bulletin No.

546, Revision 1, dated 10-03-88 and Master Drawing List No. 92480, Revision A, dated 10-03-88 and/or later FAA Approved revisions of the above data (28 Volt System) Limitations and Conditions:

1. Also eligible on Beech Model 35-C33 When Modified Per STC SA686CE.

2. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89796-1, dated 10-20-88 is required for Beech Models 35-C33 And This Model When Modified Per STC SA686CE and F33C and/or later FAA Approved revisions of the above supplement.

3. Compatability of this modification with other previously approved modifi- This catate a st se peting daid bich thered or ip proval shall remain in effect unlit sur rendered, suspended, veroked, or a termination date is otherwise established by the Ildministrator of the Federal Aviation Administration .

Date of Application: 8-10-88 Date Reissued: 10-20-88, Revision 1 Date of Issuance: . 8-29-88 Date Amended:

EDERA AVIATION By Direction of the Administrator Hard 1. 7th.man (Signature) PMINISTRATO Harold W. Holdeman DAS Staff Coordinator, DAS 5 SW (Title)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and Z1P code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and Z1P code) Exent of Authority (if licensing agreement) :

Signature of grantor (In ink) :

## Every issue (1)

- October 20, 1988: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8b/4f/8b4f6a9b2ddb3d130534f72627fc7b2a1f13f55d343c074d4c1208da67754864)

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