# STC SA2057SO - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Alpha Aviation Inc, United States - Description: Installation of shoulder harness. - Applied: January 5, 1987 - Status date: July 2, 2018 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: TCDS 695, [TCDS A-691](https://openairdocs.org/tcds/A-691), [TCDS A-692](https://openairdocs.org/tcds/A-692), [TCDS A-698](https://openairdocs.org/tcds/A-698), [TCDS ATC 660](https://openairdocs.org/tcds/ATC%20660), [TCDS 3A16](https://openairdocs.org/tcds/3A16), [TCDS A-699](https://openairdocs.org/tcds/A-699) - Certificate PDF: https://openairdocs.org/files/sha256/20/ff/20ff451963085b7a99e0427a20691b2810cd27e0b812904449d30c1f9ca250b4 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/952C3C10094BA0F1862582CC005B49A6.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA2057SO ## ADs that name it (0) None. ## Approved models (12) - Raytheon Aircraft Company 58 Series ([TCDS 3A16](https://openairdocs.org/tcds/3A16)) - Taylorcraft Inc. BFS-60 ([TCDS A-699](https://openairdocs.org/tcds/A-699)) - The New Piper Aircraft Inc. J-3 ([TCDS ATC 660](https://openairdocs.org/tcds/ATC%20660)) - The New Piper Aircraft Inc. J3C-50S ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - The New Piper Aircraft Inc. J3C-65 ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - The New Piper Aircraft Inc. J3F-50 ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - The New Piper Aircraft Inc. J3F-60S ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - The New Piper Aircraft Inc. J3L ([TCDS A-698](https://openairdocs.org/tcds/A-698)) - The New Piper Aircraft Inc. J3L-S ([TCDS A-698](https://openairdocs.org/tcds/A-698)) - The New Piper Aircraft Inc. J3P (TCDS 695) - The New Piper Aircraft Inc. PA-11 ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - The New Piper Aircraft Inc. PA-11S ([TCDS A-691](https://openairdocs.org/tcds/A-691)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Possession of this Su pplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to t he design data nor to alter an aircraft, aircraft engine, or propeller. The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is th e property of the STC holder. FAA Form 8110-2 (5/14) Page 1 of 3 Number: SA2057SO This certificate issued to: Alpha Aviation Inc. 1500 E. Main Street Owatonna, MN 55060-3188 Part *of the Civil Air Regulations. *See Airplane Specification Original Product – Type Certificate Number: ATC 660, TC695, Make: Piper A-691, A692 and A698 Model: J-3, J3P, J3L-S, J3L-65 (continued) Description of Type Design: Installation of shoulder Harness in accordance with Kosola Report KR-534, Drawing List, Revision “A”, dated February 03, 1987, or later FAA approved revisions. The approval of this change applies basically to the Piper model and series airplanes listed under Model above. This approval should not be extended to other airplanes of this model on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those previously approved modifications will produce no adverse effect upon the airworthiness of that airplane. This determination should include consideration of significant changes in weight distribution such as an increase in the fixed disposal weight in the fuselage. Date of Application: January 05, 1987 Date Reissued: July 02, 2018 Date of Issuance: February 03, 1987 Date Amended: Signature Title (for) Christina M. Underwood Manager, Atlanta ACO Branch Possession of this Su pplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to the design data nor to alter an aircraft, aircraft engine, or propeller. The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is th e property of the STC holder. FAA Form 8110-2 (5/14) Page 2 of 3 Transfer the ownership of Supplemental Type Certificate Number: SA02553AT To (Name and address of transferee) From (Name and address of grantor) Possession of this Su pplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to the design data nor to alter an aircraft, aircraft engine, or propeller. The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is th e property of the STC holder. FAA Form 8110-2 (5/14) Page 3 of 3 Model (cont.) (Army L-4C), J3L-65S, J3F-50, J3F50S, J3F-60, J3F-60S, (Army L-4D), J3F-66, J3F-65S, J3C-40, J3C-50S, (Army L-4, L- 4J) (Navy NE-1, NE-2) J3C-65, J3C-65S, Pall & Palls. -----------------------------------------------------------END--------------------------------------------------------------- ## Every issue (1) - July 2, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/20/ff/20ff451963085b7a99e0427a20691b2810cd27e0b812904449d30c1f9ca250b4) --- 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.