# STC SA09353AC-D - Type: Supplemental type certificate - Status: Current, Amended - Holder: S-TEC Corporation, United States - Description: Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-811. - Applied: April 1, 1998 - Status date: May 14, 1999 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS 3A23](https://openairdocs.org/tcds/3A23) - Certificate PDF: https://openairdocs.org/files/sha256/6f/e0/6fe0109cda0991f94f66335d840c71037a2faeb40c8776947c4a879730878e62 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/880D803C9DDC7BF185256CC1007F3AAB.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA09353AC-D ## ADs that name it (0) None. ## Approved models (15) - Maule Aerospace Technology Inc. M-5-210C ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-5-235C ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-6-235 ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-7-235 ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-7-235A ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-7-235B ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. M-7-235C ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MT-7-235 ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MX-7-180 ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MX-7-180A ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MX-7-180B ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MX-7-180C ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MX-7-235 ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MXT-7-180 ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) - Maule Aerospace Technology Inc. MXT-7-180A ([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: SA09353 AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Past 3 of the Cirit di Kegulations. Original Product I ype Certifcate A unter: 3A23 Make: Maule Model: M-5-210C, M-5-235C, M-6-235, MX-7-180, M-7-235, M-7-235А, M-7-235B, M-7-235C, MX-7-235, MX-7-180A, MX-7-180B, MX-7-180C, MXT-7-180, MXT-7-180A, Description of Type Design Change: AND MT-7-235 Installation of S-TEC System 30 ALT Altitude Hold System, Model ST-811, according to Bulletin No. 911, Revision 2, dated 5-11-99 and Master Drawing List No. 921086, Revision B, dated 5-11-99 or later FAA Approved revisions of the above data (14 Volt System). Also eligible on models M-5-210C, M-5-235C, M-6-235, MX-7-180, M-7-235, M-7-235A. M-/-235B, M-7-235C, and MX-7-235 (landplane, floatplane, or amphibian configuration). (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: 4-01-98 Date Reissued: Date of Issuance: 4-03-98 Date Amended: 10-15-98, 11-16-98, 5-14-99, Revision 3 By Direction of the Administrator FEDERAL AVIATION (Signature) TOMNISTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA09353ACD, Revision 2 Limitations and Conditions: (con't.) Also eligible on models MX-7-180A, MX-7-180B, MX-7-180C, MXT-7-180, MXT-7-180A, and MT-7-235 (landplane configuration). FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891699, dated 4-03-98 is required for Maule Models M-5-210C, M-5-235C, M-6-235, MX-7-180, M-7-235, M-7-235C, and MX-7-235 (Landplane Configuration) 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 891700, dated 4-03-98 is required for Maule Models MXT-7-180 and MXT-7-180A (Landplane Configuration) or later FAA Approved revisions of the above supplement. 5. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891701, dated 4-03-98 is required for Maule Model MT-7-235 (Landplane Configuration) 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 891702, dated 4-03-98 is required for Maule Models M-5-210C, M-5-235C, M-6-235, MX-7-180, M-7-235, M-7-235A, M-7-235B, and MX-7-235 (Floatplane or Amphibian Configuration) or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891821S, dated 10-15-98 is required for Maule Model MX-7-180C (Landplane Configuration) or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891821S, Revision 1, dated 5-14-99 is required for Maule models MX-7-180A, MX-7-180B, and MX-7-180C (landplane configuration) 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 (10-€8) Page 2 of 2 The FAR 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 ZIP code) Extent of Authority (if licensing agreement) : Signature of grantor (In ink): ## Every issue (1) - May 14, 1999: Amended, Current. [certificate](https://openairdocs.org/files/sha256/6f/e0/6fe0109cda0991f94f66335d840c71037a2faeb40c8776947c4a879730878e62) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.