# STC SA5361SW-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-237, with optional automatic electric trim system.
- Applied: November 13, 1984
- Status date: May 6, 1991
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- Certificate PDF: https://openairdocs.org/files/sha256/22/05/220573f29187f230cd68712efea6971b204dd3b8bfea36b2e79f85d9f9ddd0f4
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0419075536D27C4C85256CC2001228A3.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA5361SW-D

## ADs that name it (0)

None.

## Approved models (4)

- Cessna Aircraft Company 414 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421B ([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.

Brit. So • 2 cro Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SA5361SW-D This certificate issued to: S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, Texas 76067 Certifies that the change in the type design for the following product with the limilations and conditions thomfor as specified hereon meets the airworthiness requiremonts of Port 3 of the CiVIl Air Regulations Original Product -TypoContificato Numbon: ATCE Make: CESSNA Model: 414; 421, 421A, and 421B Description of Type Design Change: .

Installation of S-TEC System 60 Two Axis Automatic Flight Guidance System, Model ST-237, with Optional Automatic Electric Trim System according to Bulletin No. 337, Revision 4, dated 4-22-91 and Master Drawing List No. 92296, Revision D, dated 4-22-91 and/or later FAA Approved revisions of the above data (28 Volt System).

1: Also eligible on Model 414 when modified per STC SA2354SW or SA4379SW (RAM 325 H.P. Engine Conversion).

2. Also eligible on Model 421B when modified per STC SA18NW (Robertson STOL Conversion).

(See Continuation Sheet, Page 2, a part of this STC.)

Thomas DAS Staff Coordinator, DAS 5 SW (Tille)

47.

**FAA 7O8 8110-2 (10-68)**

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA53615W-D, Revision 3 Limitations and Conditions: (con't.)

3. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane and/or later FaA Approved revisions of the above supplement. P/N 89558, dated 12-06-84 is required for Cessna Model 421B

4. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Fift Main accordance with SPC SAiN (Robertson STOL Conversion) and/or later dated 12-06-84 is required for Cessna Model 4218 when FAA Approved revisions of the above supplement.

5. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89558-1, dated 9-10-86 is required for Cessna Model 4218 and/or later FAA Approved revisions of the above supplement.

6. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89575-1, dated 9-10-86 is required for Cessna Model 421B when modified in accordance with STC SA18NW (Robertson STOL Conversion) and/or later FAA Approved revisions of the above supplement.

7. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89758, dated 9-30-87 is required for Cessna Model 414 and when modified in accordance with STC SA2354SW or SA4379SW (RAM 325 H.P. Engine Conversion) and/or later FAA Approved revisions of the above supplement.

FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89919, dated 5-06-91 is required for Cessna Models 421 and 421F and/or later FAA Approved revisions of the above supplement.

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

t7 PAGE 2 OF 2 PAGES

TRANSFER ENDORSEMENT Transter the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code ) trom (Name of grantor) (Print or type) - (Address of grantor) (Number and street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

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

## Every issue (1)

- May 6, 1991: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/22/05/220573f29187f230cd68712efea6971b204dd3b8bfea36b2e79f85d9f9ddd0f4)

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