# STC SA09370AC-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-823.
- Applied: June 17, 1998
- Status date: June 19, 1998
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A16EA](https://openairdocs.org/tcds/A16EA)
- Certificate PDF: https://openairdocs.org/files/sha256/6c/61/6c6193a58720ae0499b1254d0ba628c2e37637a4723afcb277ddfed12fa6ad8c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/29C12021FDB7C88B85256CC1007F3ABF.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09370AC-D

## ADs that name it (0)

None.

## Approved models (1)

- True Flight Holdings LLC AG-5B ([TCDS A16EA](https://openairdocs.org/tcds/A16EA))

## 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: SA09370AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 fast 25 of the Fadent-d rintion Regulutions.

Original Product I ype Certifiate A umber e A16EA Make: American General Model: AG-5B Description of 5 ype Design Change:

Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-823, according to Bulletin No.

923, dated 6-15-98 and Master Drawing List No. 921097, dated 6-15-98 or later FAA Approved revisions of the above data (28 Volt System).

FAA/DAS Approved Supplemental Flight Manual, P/N 891740, dated 6-19-98 is required for American General Model AG-5B or later FAA Approved revisions of the above supplement.

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

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

suspended, revoked or a termination date is otherese estatlisted by the Adminstrator of the Federed st vition /dinistration.

I ate of reppliention: 6-17-98 Late sisted:

Date of Issuance: 6-19-98 Date Amended:

By Direction of the Administrator FEDERAL AVIATION (Signature) TOMINSTRATOT Michael Keirnan DAS Staff Coordinator. DAS 5 SW (Title)

Page 1 of 1 This certificate be transferred in accordance with FAR 21.47.

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 19, 1998: Issued, Current. [certificate](https://openairdocs.org/files/sha256/6c/61/6c6193a58720ae0499b1254d0ba628c2e37637a4723afcb277ddfed12fa6ad8c)

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