# STC SA5351SW-D - Type: Supplemental type certificate - Status: Current, Issued - Holder: S-TEC Corporation, United States - Description: Installation of S-TEC System 40/50, single and two axis automatic flight guidance systems, Model ST-232-40/50. - Applied: October 4, 1984 - Status date: November 23, 1984 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS 1A8](https://openairdocs.org/tcds/1A8) - Certificate PDF: https://openairdocs.org/files/sha256/51/c4/51c49cabd8482a0057879a23ee432206b9571f052f344e5f09e396baf023ebee - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C36F123E8BCEE5DE85256CC200122892.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA5351SW-D ## ADs that name it (0) None. ## Approved models (5) - Helio Aircraft LLC H-250 ([TCDS 1A8](https://openairdocs.org/tcds/1A8)) - Helio Aircraft LLC H-295 (USAF U10D) ([TCDS 1A8](https://openairdocs.org/tcds/1A8)) - Helio Aircraft LLC H-700 ([TCDS 1A8](https://openairdocs.org/tcds/1A8)) - Helio Aircraft LLC H-800 ([TCDS 1A8](https://openairdocs.org/tcds/1A8)) - Helio Aircraft LLC HT-295 ([TCDS 1A8](https://openairdocs.org/tcds/1A8)) ## 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: SA53515W-D This certificate issued to: 1e. S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, TX 76067 Pure 3 of the CIVIl Air Regulations. Original Product - Type Bertificate Number: 1A8 Make: HELIO Model: H-250, H-295, HT-295, H-700 AND H-800 Description of Type Design Change: Installation of S-TEC System 40/50, Single and Two Axis Automatic Flight Guidance Systems, Model ST-232-40/50, according to Bulletin No. 332, dated 9-26-84 and Master Drawing List No. 92264, dated 9-26-84 and/or later FAA Approved revisions of the above data (28 Volt System). 1. Eligible on Landplane or Floatplane Configurations for Helio Models H-250, H-295, HT-295 and H-800. 2. Eligible only on Landplane Configurations for Helio Model H-700. (See Continuation Sheet, Page 2, a part of this STC). Date of Application: 10-04-84 Date Reissued: Date of Issuance: . 11-23-84 Date Amended: EDERAL AVIATIO By Direction of the Administrator (Signature) OMINISTRI ATIO DAS Staff Coordinator, DAS 5 SW Harold W. Holdeman (Title). 47 21.47. FAA Fix 8110-2 (10-69) taniceo States of Almerica Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Shect) Number: SA53515W-D Limitations and Conditions: (con't) 3. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89375, dated 11-23-84 is required for Helio Model H-800, Landplane and Floatplane Configurations for S-TEC System 40 and/or later FAA Approved revisions of the above supplement. 4. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89376, dated 11-23-84 is required for Helio Model H-800, Landplane and Floatplane Configurations for S-TEC System 50 and/or later FAA Approved revisions of the above supplement. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89529, dated 11-23-84 is required for Helio Model H-700, Landplane Configuration Only for S-TEC System 40 and/or later FAA Approved revisions of the above supplement. 6. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89530, dated 11-23-84 is required for Helio Model H-250, H-295 and HT-295, Landplane and Floatplane Configuration for S-TEC System 40 and/or later FAA Approved revisions of the above supplement. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89531, dated 11-23-84 is required for Helio lodel H-/00, Landplane Configuration Only for S-TEC System 50 and/or later -AA Approved revisions of the above supplement FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89532, dated 11-23-84 is required for Helio Models H-250, H-295 and HT-295, Landplane and Floatplane Configuration for S-TEC System 50 and/or later FAA Approved revisions of the above supple- Compatability of this modification with other previously approved modifications must be determined by the installer. there of this certifeats is panshable by a fine of not exceeding $1,000, or unpronment not exceeding 3 years, a in AS fORM! 8110-21 (10-69) This certificate may be transferred in accordance with FAR -1 ! 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) - November 23, 1984: Issued, Current. [certificate](https://openairdocs.org/files/sha256/51/c4/51c49cabd8482a0057879a23ee432206b9571f052f344e5f09e396baf023ebee) --- 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.