# STC SA8383SW-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-525-40/50. - Applied: March 17, 1994 - Status date: February 11, 1998 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS A20SO](https://openairdocs.org/tcds/A20SO) - Certificate PDF: https://openairdocs.org/files/sha256/95/2a/952aa362b0cb480b2864ed87bf0fa7ee1a88c14973d09f89c655458e1a39dc20 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4732D3E39D8E916985256CC20058E76C.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA8383SW-D ## ADs that name it (0) None. ## Approved models (3) - The New Piper Aircraft Inc. PA-31 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO)) - The New Piper Aircraft Inc. PA-31-300 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO)) - The New Piper Aircraft Inc. PA-31-325 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO)) ## 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: SA8383SW-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 bivil it ir Regulations. Original Product Type Certifcate Number: A20SO Make: Piper Model: PA-31, PA-31-300, and PA-31-325 Description of Type Design Change: Installation of S-TEC System 40/50 Single and Two Axis Automatic Flight Guidance Systems, Model S1-325-40/50, according to Bulletin No. 625, Revision 2, dated 12-02-97 and Master Drawing List No 92674, Revision B, dated 12-02-97 or later FAA Approved revisions of the above data (28 Volt System). Also eligible on Models PA-31 and PA-31-300 When Modified Per STC SA970SO (350 H.P. Colemill Conversion). Also eligible on Model PA-31-325 When Modified Per STC SA00048SE (Vortex Generator System). (See Continuation Sheet, Page 2, a part of this STC.) Date of Application: 3-17-94 Date Reissued: Date of Issuance: 3-28-94 Date Amended: 9-21-94, 10-17-95, 12-05-97, 2-11-98, Revision 4 By Direction of the Administrator FEDERAL AVIATION Alien Ther TAMINSTRATO William J. Thomas DAS Staff Coordinator, DAS 5 SW (Title) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA83835W-D, Revision 4 Limitations and Conditions: (con't.) FAA/DAS Approved Airplane Flight Manual Supplement, P/N 891053, dated 3-28-94 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) for S-TEC System 40 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 891054, dated 3-28-94 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) for S-TEC System 50 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 891054-1, dated 10-17-95 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) 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 891053, Revision 1, dated 12-05-97 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) for S-TEC System 40 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891054, Revision 2, dated 12-05-97 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) 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 891608, dated 12-05-97 is required for Piper Model PA-31-325 And The Above Model When Modified Per STC SA00048SE (Vortex Generator System) for S-TEC System 40 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891609, dated 12-05-97 is required for Piper Model PA-31-325 And The Above Model When Modified Per STC SA00048SE (Vortex Generator System) 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. 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 and street) (City, State, and ZIP code) Extent of Authority (if licensing agreement): - Date of Transfer:. Signature of grantor (In ink): - U.S. GOVERNMENT PRINTING OFFICE: 1966 OF-205-579 ## Every issue (1) - February 11, 1998: Amended, Current. [certificate](https://openairdocs.org/files/sha256/95/2a/952aa362b0cb480b2864ed87bf0fa7ee1a88c14973d09f89c655458e1a39dc20) --- 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.