# STC SA09373AC-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-828
- Applied: June 10, 1998
- Status date: June 12, 1998
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A15](https://openairdocs.org/tcds/3A15)
- Certificate PDF: https://openairdocs.org/files/sha256/15/39/153984c16c07e173893a82e8a1d8e9b222414480ff8307dd81b90d0bdc0ec49a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DDEA4158BD94C39985256CC1007F3AC4.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09373AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Beechcraft Corporation 35-C33 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))
- Beechcraft Corporation F33C ([TCDS 3A15](https://openairdocs.org/tcds/3A15))

## 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: SA09373AC-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 aimothiness requiements of Past 3 of the Card An Regulations.

Original Product I ype berlipcate A umber: ЗА15 Make: Beech Model: 35-C33 and F33C Description of Type Design Change:

Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-828, according to Bulletin No 928, dated 6-08-98 and Master Drawing List No. 921101, dated 6-08-98 or later FAA Approved revisions of the above data (28 Volt System).

Also eligible on Model 35-C33 When Modified Per STC SA686CE.

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

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.

riation Adminishation.

Date of Application: 6-10-98 Date Reissued:

Date of Issuance: 6-12-98 Date Amended:

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

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement. P/N 891747. dated 6-12-98 is required for Beech Models 35-C33 And This Model When Modified Per STC SA686CE and F33C 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 8110-2-1110-691 Page 2 of 2 This certificate may be transferred In acmordance with EAR 21.

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 12, 1998: Issued, Current. [certificate](https://openairdocs.org/files/sha256/15/39/153984c16c07e173893a82e8a1d8e9b222414480ff8307dd81b90d0bdc0ec49a)

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