# STC SA09337AC-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-744.
- Applied: January 28, 1998
- Status date: January 30, 1998
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- Certificate PDF: https://openairdocs.org/files/sha256/6f/68/6f687bc6188e564643866cda32914eeae38b9645556b265957efdcb99309b501
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5D7774CE2ED2441F85256CC1007F3A9A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09337AC-D

## ADs that name it (0)

None.

## Approved models (6)

- Cessna Aircraft Company 401 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 401A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 401B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 402C ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))

## 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: SA09337AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 I ast 3 of the Civil is Regulations.

Original Product I ype Certifeate Number: ATCE Make: Cessna Al cdel : 401, 401A, 401B, 402A, 402B, and 402C Description of Type Design Change:

Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-744, according to Bulletin No. 844, dated 1-27-98 and Master Drawing List No. 921068, dated 1-27-98 or later FAA Approved revisions of the above data (28 Volt System).

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891650, dated 1-30-98 is required for Cessna Models 401, 401A, and 401B or later FAA Approved revisions of the above supplement.

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

Date of Application: 1-28-98 Date Reissued:

Date of Issuance: 1-30-98 Date Amended:

By Direction of the Administrator FEDERAL AVIATION Wein ann TOMNISTRATO William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title)

FAR Form 8110-2(10-68) Page 1 of 2

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09337AC-D Limitations and Conditions: (con't.)

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891651, dated 1-30-98 is required for Cessna Models 402A and 402B or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891652, dated 1-30-98 is required for Cessna Model 402C or later FAA Approved revisions of the above supplement.

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

PAA Form 8110-2-1(10-69) Page 2 of 2 This certificate may 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)

- January 30, 1998: Issued, Current. [certificate](https://openairdocs.org/files/sha256/6f/68/6f687bc6188e564643866cda32914eeae38b9645556b265957efdcb99309b501)

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