# STC SA09271AC-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-681.
- Applied: August 14, 1997
- Status date: August 20, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A3](https://openairdocs.org/tcds/2A3)
- Certificate PDF: https://openairdocs.org/files/sha256/a5/02/a50297724e328242cde970670e27452cb789cd9ade979d890f91a9743b3b7bee
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/02611D2205C8D50385256CC1007F3A56.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09271AC-D

## ADs that name it (0)

None.

## Approved models (1)

- Mooney International Corporation M20K ([TCDS 2A3](https://openairdocs.org/tcds/2A3))

## 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: SA09271 AC-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 bist it i Regulations.

Original Product Type Certifcate Number: 2A3 Make: Mooney Model.: M20k Description of Type Design Change:

Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-681, according to Bulletin No. 781, dated 8-12-97 and Master Drawing List No. 921022, dated 8-12-97 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 891509, dated 8-20-97 is required for Mooney Model M20K 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: 8-14-97 Date Reissued:

Date of Issuance: 8-20-97 Date Amended:

By Direction of the Administrator FEDERAL AVIATION in humm TOMINISTRATIOS William J. Thomas DAS Stall Coordinator, DAS 5 SW (Title)

47.

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 TIP codel Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- August 20, 1997: Issued, Current. [certificate](https://openairdocs.org/files/sha256/a5/02/a50297724e328242cde970670e27452cb789cd9ade979d890f91a9743b3b7bee)

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