# STC SA09234AC-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-688.
- Applied: June 6, 1997
- Status date: June 11, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A21](https://openairdocs.org/tcds/3A21)
- Certificate PDF: https://openairdocs.org/files/sha256/cf/bf/cfbf31cce0e3e6a9b09e5a23cc00cd96db9c21f79b3e921a2e45aa3b51180fbe
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F4959AAD267DA8EC85256CC1007F3A32.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09234AC-D

## ADs that name it (0)

None.

## Approved models (6)

- Cessna Aircraft Company 210G ([TCDS 3A21](https://openairdocs.org/tcds/3A21))
- Cessna Aircraft Company 210H ([TCDS 3A21](https://openairdocs.org/tcds/3A21))
- Cessna Aircraft Company 210J ([TCDS 3A21](https://openairdocs.org/tcds/3A21))
- Cessna Aircraft Company T210G ([TCDS 3A21](https://openairdocs.org/tcds/3A21))
- Cessna Aircraft Company T210H ([TCDS 3A21](https://openairdocs.org/tcds/3A21))
- Cessna Aircraft Company T210J ([TCDS 3A21](https://openairdocs.org/tcds/3A21))

## 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: SA09234AC-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 Civil Air Regulations.

Original Product I yo Certificate Number: 3A21 Make: Cessna Model: 210G, T210G, 210H, T210H, 210J, and T210J Description of Type Design Change:

Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-688, according to Bulletin No. 788, dated 6-04-97 and Master Drawing List No. 921003, dated 6-04-97 or later FAA Approved revisions of the above data (14 Volt System).

1. Also eligible on Models T210G, T210H, and T210J When Modified Per STC SA2689SW RAM Modification).

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

Date of Application: 6-06-97 Date of Issuance: 6-11-97

FEDERAL AVIATION Date Reissued:

By Direction of the Administrator Ween thoma TOMINSTRATO DAS Staff Coordinator, DAS 5 SW William J. Thomas (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number 5A09234 AC-D Limitations and Conditions: (con't.)

2. FAA/DAS Approved Supplemental Flight Manual, P/N 891416, dated 6-11-97 is required for Cessna Models 210G, T210G, 210H, T210H, 210J, and T210J and Models T210G, T210H, and T210J When Modified Per STC SA2689SW (RAM Modification) 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.

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

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

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)

- June 11, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/cf/bf/cfbf31cce0e3e6a9b09e5a23cc00cd96db9c21f79b3e921a2e45aa3b51180fbe)

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