# STC SA7786SW-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 40/50 single and two axis atutomatic flight guidance systems, model ST-399-40/50.
- Applied: January 11, 1991
- Status date: January 28, 1991
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A17](https://openairdocs.org/tcds/3A17)
- Certificate PDF: https://openairdocs.org/files/sha256/db/d4/dbd47dba9792de0ae2edc5df760364b16d0eaaf8e9d610e7d0e10792d976351e
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F81751485CBFBCE386257FF5006078C9.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA7786SW-D

## ADs that name it (0)

None.

## Approved models (4)

- The Cessna Aircraft Company R172E Series ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company R172F (USAF T-41D) ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company R172G Series ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company R172H (USAF T-41D) ([TCDS 3A17](https://openairdocs.org/tcds/3A17))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

800 5003 & 9 m9 Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA77865W-D This certificate issued to: S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, lexas /60b/ Port 3 of the CiVIl A ir Regulations Original Product -Type Contificato Numbon: 3A17 Make: Cessna Model: R172E, R172F, R172G, and R172H Description of Type Design Change:

Installation of S-TEC System 40/50 Single and Two Axis Automatic Flight Guidance Systems, Model S1-399-40/50, according to Bulletin No. 499, dated 1-10-91 and Master Drawing List No. 92531, dated 1-10-91 and/or later FAA Approved revisions of the above data (28 Volt System).

1. FAA/DAS Approved Supplemental Flight Manual, P/N 89904, dated 1-28-91 is required for S-TEC System 40 and/or later FAA Approved revisions of the above supplement.

2. FAA/DAS Approved Supplemental Flight Manual, P/N 89905, dated 1-28-91 is required for S-TEC System 50 and/or later FAA Approved revisions of the above supplement.

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

Thomas (Signalzi (Title)

This certificate may be transferred in eccordance with FAR 21.17 PAA 7008 81 10-2 (10-681

The FAA will reissuc the certificate in the name of the transferee and forward it to him.

Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) _ (Address of transferee).

(Number and street ) (City, State, and ZIP code ) from (Name of grantor) (Print or type) (Address of grantor) ( Nunher and streel) (Citr. Stale, and ZIP rode) Extent of Authority (if licensing agreement):

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

## Every issue (1)

- January 28, 1991: Issued, Current. [certificate](https://openairdocs.org/files/sha256/db/d4/dbd47dba9792de0ae2edc5df760364b16d0eaaf8e9d610e7d0e10792d976351e)

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