# STC SA09128AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 40/50 single and two axis automatic flight guidance systems, Model ST-609-40/50.
- Applied: October 30, 1995
- Status date: May 28, 1998
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A23](https://openairdocs.org/tcds/3A23)
- Certificate PDF: https://openairdocs.org/files/sha256/af/37/af37d4d9e66e7e2c0f846fcdd5f06c1a47e34e26fd971c99b050b22c45f044d1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DAC4C0EE7D05A10F85256CC1007F39CE.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09128AC-D

## ADs that name it (0)

None.

## Approved models (2)

- Maule Aerospace Technology Inc. MT-7-235 ([TCDS 3A23](https://openairdocs.org/tcds/3A23))
- Maule Aerospace Technology Inc. MX-7-180C ([TCDS 3A23](https://openairdocs.org/tcds/3A23))

## 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: SA09128AC-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 bied A i Regulations.

Original Product I ype Certificate A umber: 3A23 Make: Maule Model: MX-7-180C and MT-7-235 Description of Type Design Change:

Installation of S-TEC System 40/50 Single and Two Axis Automatic Flight Guidance Systems, Model ST-609-40/50, according to Bulletin No. 709, Revision 3, dated 5-22-98 and Master Drawing List No. 928 16, Revision C, dated 5-22-98 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 891211S, dated 11-06-95 is required for Maule Model MT-7-235 for S-TEC System 40 or later FAA Approved revisions of the above supplement.

(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.

Date of Application: 10-30-95 Date Reissued:

Date of Issuance: 11-06-95 Date Amended: 2-18-97, 5-28-98, Revision 2 By Direction of the Administrator FEDERAL AVIATION Milli (Signature) TOMINSTRATOS William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title)

FAA Form 8110-2(10-68) Fage 1 of 2

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):

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09128AC-D, Revision 2 Limitations and Conditions: (con't.)

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 8912125, dated 11-06-95 is required for Maule Model MT-7-235 for S-TEC System 50 or later FAA Approved revisions of the above supplement.

3. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891324S, dated 2-18-97 is required for Maule Model MX-7-180C for S-TEC System 40 or later FAA Approved revisions of the above supplement.

4. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891325S, dated 2-18-97 is required for Maule Model MX-7-180C for S-TEC System 50 or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891324S, Revision 1, dated 5-28-98 is required for Maule Model MX-7-180C for S-TEC System 40 or later FAA Approved revisions of the above supplement.

6. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891325S, Revision 1, dated 5-28-98 is required for Maule Model MX-7-180C for S-TEC System 50 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 8110-2-1(10-69) Page 2 of 2

## Every issue (1)

- May 28, 1998: Amended, Current. [certificate](https://openairdocs.org/files/sha256/af/37/af37d4d9e66e7e2c0f846fcdd5f06c1a47e34e26fd971c99b050b22c45f044d1)

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