# STC SA09304AC-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-742.
- Applied: November 6, 1997
- Status date: November 10, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A20CE](https://openairdocs.org/tcds/A20CE)
- Certificate PDF: https://openairdocs.org/files/sha256/93/25/9325f9d0abf431854c8d99088cf33797c241f13aa6026cb33e9575ec6d630f4f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BE34257068E0877485256CC1007F3A77.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09304AC-D

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 177RG ([TCDS A20CE](https://openairdocs.org/tcds/A20CE))

## 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: SA09304AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specifed hereon meets the aiworthiness requrements of I art 23 of the Federal It viation Kegulations.

Original Product Type Certifeute Number: A20CE Make: Cessna Model: 177RG Description of Type Design Change:

Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-742, according to Bulletin No. 842, dated 11-05-97 and Master Drawing List No. 921044, dated 11-05-97 or later FAA Approved revisions of the above data (14 Volt System).

FAA/DAS Approved Supplemental Flight Manual, P/N 891587, dated 11-10-97 is required for Cessna Model 177RG, S/N 177RG0787 and Below or later FAA Approved revisions of the above supplement.

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

Date of Application: 11-06-97 Date Reissued:

Date of Issuance: 11-10-97 Date Amended:

By Direction of the Administrator FEDERAL AVIATION Wein thana TOMINISTRATIO William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title) ding 3 years, or both.

with FAR 21.47.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09304AC-D FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891588, dated 11-10-97 is required for Cessna Model 177RG, S/N 177RG0788 through S/N 177RG1266 or later FAA Approved revisions of the above supplement.

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

FAA Form 8110-2-1 (10-69) Page 2 of 2

TRANSFER ENDORSEMENT 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) (Number & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink) :

## Every issue (1)

- November 10, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/93/25/9325f9d0abf431854c8d99088cf33797c241f13aa6026cb33e9575ec6d630f4f)

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