# STC SA09423AC-D - Type: Supplemental type certificate - Status: Current, Issued - Holder: S-TEC Corporation, United States - Description: Installation of S-TEC System 40X/50X Single and Two Axis Automatic Flight Guidance Systems, Model ST-781-40X/50X - Applied: June 1, 2000 - Status date: June 5, 2000 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS 5A6](https://openairdocs.org/tcds/5A6) - Certificate PDF: https://openairdocs.org/files/sha256/c3/f8/c3f8814ca8a14021f8c74a3637e8710f48ddae87e5fd3432518cc273fc131b7f - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/699BA8D63DE7F6F485256CC1007F3AF4.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA09423AC-D ## ADs that name it (0) None. ## Approved models (11) - Cessna Aircraft Company 180 ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180A ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180B ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180C ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180D ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180E ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180F ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180G ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180H ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180J ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) - Cessna Aircraft Company 180K ([TCDS 5A6](https://openairdocs.org/tcds/5A6)) ## 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 5A09423 AC-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 fellowing product with the limitations and conditions therefor as specifed hereon meets the aworthiness requiements of 9 art 3 of the Civil In Regulations. Original Product Type Certificate Number : 5A6 Make: Cessna Model: 180, 180A, 180B, 180C, 180D, 180E, 180F, 180G, 180H, 180J, and 180K Description of Type Design Change: Installation of S-TEC System 40X/50X Single and Two Axis Automatic Flight Guidance Systems, Model ST-781-40X/50X, according to Bulletin No. 881, dated 5-30-00 and Master Drawing List No. 921168, dated 5-30-00 or later FAA Approved revisions of the above data (14 Volt System). (See Continuation Sheets, Pages 2, and 3 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: 6-01-00 Date Reissued: Date of Issuance: 6-05-00 Date Amended: By Direction of the Administrator FEDERAL BAVA TON she 12 (Signature) TOMINISTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title) FAA Form: 8110-2 (10-68) Page 1 of United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09423 AC-D Limitations and Conditions: (con't.) Also eligible on the above models (floatplane or amphibian) when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or STC SA1705WE (internal tip tanks). 2. Also eligible on the above models (landplane) when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or any combination of the following STC's: STC SA649NW (gross weight increase), STC SA09132SC (engine conversion), STC SA09030SC (Hartzell propeller), STC SA1603SO (speed kit), STC SA1705WE (internal tip tanks). 3. FAA/DAS Approved Supplemental Flight Manual, P/N 891904, dated 6-05-00 is required for 1. Cessna models 180, 180A, 180B, 180C, 180D, 180E, and 180F (floatplane or amphibian) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or STC SA1705WE (internal tip tanks); 2. Cessna models 180, 180A, 180B, 180C, 180D, 180E, and 180F (landplane) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or any combination of the following STCs: STC SA649NW (gross weight increase), STC SA09132SC (engine conversion), STC SA09030SC (Hartzell propeller), STC SA1603SO (speed kit), STC SA1705WE (internal tip tanks) for S-TEC System 40X or later FAA Approved revisions of the above supplement. 4. FAA/DAS Approved Supplemental Flight Manual, P/N 891905, dated 6-05-00 is required for 1. Cessna models 180G, 180H, 180J; and 180K, S/N 18053000 and below (floatplane or amphibian) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or STC SA1705WE (internal tip tanks); 2. Cessna models 180G, 180H, 180J; and 180K, S/N 18053000 and below (landplane) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or any combination of the following STCs: STC SA649NW (gross weight increase), STC SA09132SC (engine conversion), STC SA09030SC (Hartzell propeller), STC SA1603SO (speed kit), STC SA1705WE (internal tip tanks) for S-TEC System 40X 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 891906, dated 6-05-00 is required for 1. Cessna model 180K, S/N 18053001 and on (floatplane or amphibian) and the above model when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or STC SA1705WE (internal tip tanks); 2. Cessna model 180K, S/N 18053001 and on (landplane) and the above model when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or any combination of the following STCs: STC SA649NW (gross weight increase), STC SA09132SC (engine conversion), STC SA09030SC (Hartzell propeller), STC SA1603SO (speed kit), STC SA1705WE (internal tip tanks) for S-TEC System 40X or later FAA Approved revisions of the above supplement. FAA Form 8110-2-1(10-69) Page 2 of 3 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09423 AC-D Limitations and Conditions: (con't.) 6. FAA/DAS Approved Supplemental Flight Manual, P/N 891909, dated 6-05-00 is required for 1. Cessna models 180, 180A, 180B, 180C, 180D, 180E, and 180F (floatplane or amphibian) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or STC SA1705WE (internal tip tanks); 2. Cessna models 180, 180A, 180B, 180C, 180D, 180E, and 180F (landplane) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or any combination of the following STCs: STC SA649NW (gross weight increase), STC SA09132SC (engine conversion), STC SA09030SC (Hartzell propeller), STC SA1603SO (speed kit), STC SA1705WE (internal tip tanks) for S-TEC System 50X or later FAA Approved revisions of the above supplement. 7. FAA/DAS Approved Supplemental Flight Manual, P/N 891910, dated 6-05-00 is required for 1. Cessna models 180G, 180H, 180J; and 180K, S/N 18053000 and below (floatplane or amphibian) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or STC SA1705WE (internal tip tanks); 2. Cessna models 180G, 180H, 180J; and 180K, S/N 18053000 and below (landplane) and the above models when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or any combination of the following STCs: STC SA649NW (gross weight increase), STC SA09132SC (engine conversion), STC SA09030SC (Hartzell propeller), STC SA1603SO (speed kit), STC SA1705WE (internal tip tanks) for S-TEC System 50X or later FAA Approved revisions of the above supplement. 8. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891911, dated 6-05-00 is required for 1. Cessna model 180K, S/N 18053001 and on (floatplane or amphibian) and the above model when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or STC SA1705WE (internal tip tanks); 2. Cessna model 180K, S/N 18053001 and on (landplane) and the above model when equipped with STC SA1435WE (Robertson STOL) or STC SA967CE (Horton STOL) and/or any combination of the following STCs: STC SA649NW (gross weight increase), STC SA09132SC (engine conversion), STC SA09030SC (Hartzell propeller), STC SA1603SO (speed kit), STC SA1705WE (internal tip tanks) for S-TEC System 50X or later FAA Approved revisions of the above supplement. 9. Compatibility of this modification with other previously approved modifications must be determined by the installer. FAA Form 8110-2-1 (10-69) Page 3 of 3 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 5, 2000: Issued, Current. [certificate](https://openairdocs.org/files/sha256/c3/f8/c3f8814ca8a14021f8c74a3637e8710f48ddae87e5fd3432518cc273fc131b7f) --- 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.