# STC SA09279AC-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-675.
- Applied: October 7, 1997
- Status date: October 10, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A17](https://openairdocs.org/tcds/3A17)
- Certificate PDF: https://openairdocs.org/files/sha256/fe/3a/fe3ae2fbeb7e56c1d652c2f2d25f07bcad216acfbea9cba82f5d3306d27845fe
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C60D60E352F14C7C85256CC1007F3A5F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09279AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Cessna Aircraft Company R172J ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company R172K ([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.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number 5A09279 AC-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 requiements of'S art 3 of the birt Air kegulations.

Original Product I ype Certificate Number: ЗА17 Make: Cessna Model: R172J AND RI72K Description of Type Design Change:

Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-675, according to Bulletin No. 775, dated 10-6-97 and Master Drawing List No. 921025, dated 10-6-97 or later FAA Approved revisions of the above data (14 Volt System).

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891527, dated 10-10-97 is required for Cessna Models R172J and R172K or later FAA Approved revisions of the above supplement.

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

Date of Application: 10-7-97 Date Reissued:

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

By Direction of the Administrator FEDERAL AVIATION Wiin He TOMNISTRATIO William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title) 47

State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- October 10, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/fe/3a/fe3ae2fbeb7e56c1d652c2f2d25f07bcad216acfbea9cba82f5d3306d27845fe)

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