# STC SA09278AC-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 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/9e/c7/9ec72870dfc2ad3afd714aad8a35364371c7620adc5ad8cc578534d769c49a2a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/025920AAD9829C0485256CC1007F3A5E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09278AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Cessna Aircraft Company 172M ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172N ([TCDS 3A12](https://openairdocs.org/tcds/3A12))

## 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: SA09278AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Part 3 of the bird In Kegulations.

Original Product Type berlifcate Number: ЗА12 Make: Cessna Model: 172M AND 172N 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).

I. Also eligible on The Above Models When Modified By 180H.P. Engine Conversion.

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

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

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

By Direction of the Administrator FEDERAL AVIATION Wusine) (signature) Humar TOMINISTRATIO William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title)

FAA Form 8110-2(10-68) This certificate : ordance with FAR 21.47

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09278AC-D Limitations and Conditions: (con't.)

2. FAA/DAS Approved Supplemental Flight Manual, P/N 891525, dated 10-10-97 is required for Cessna Model 172M And The Above Model When Modified By 180 H.P. Engine Conversion or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891526, dated 10-10-97 is required for Cesssna Model 172N And The Above Model When Modified By 180 H.P. Engine Conversion 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 ,

INSTRUCTIONS: The transfer endotaement below may be used to notify the appropriase FAA Regional Office of the transfer of the Supplemental Type Certificate.

The FAA will reissue the certificate in the name of the transferee and forward it to ture.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIF code) from Name of grantor) (Print or type) (Address of grantor) (Number & street) (City, State, and 2IP codel Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- October 10, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/9e/c7/9ec72870dfc2ad3afd714aad8a35364371c7620adc5ad8cc578534d769c49a2a)

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