# STC SA02579AK - Type: Supplemental type certificate - Status: Current, Issued - Holder: Willow Mountain Ranch, United States - Description: Installation of Swing bar - Applied: October 6, 2022 - Status date: December 21, 2023 - Product: Aircraft, Small Airplane - Certification basis: Part 23 - Data sheets: [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 1A2](https://openairdocs.org/tcds/1A2) - Certificate PDF: https://openairdocs.org/files/sha256/36/e9/36e9b7f9b4860d001bd78301170777a6854031159f08d90664feb18ac425b415 - Approved model list and other attachments: [SA02529AK_AML.pdf](https://openairdocs.org/files/sha256/4d/e8/4de83210609f877c0070cf6f06252989be6254069448e411205ea96b21af64e9) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID167251093920231227180820.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA02579AK ## ADs that name it (0) None. ## Approved models (35) - Piper Aircraft Inc. J3C-40 ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - Piper Aircraft Inc. J3C-50 ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - Piper Aircraft Inc. J3C-50S ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - Piper Aircraft Inc. J3C-65 (Army L-4; L-4A; L-4B (Navy NE-1); L-4H; L-4J (Navy NE-2)) ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - Piper Aircraft Inc. J3C-65S ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - Piper Aircraft Inc. J3F-50 ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - Piper Aircraft Inc. J3F-50S ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - Piper Aircraft Inc. J3F-60 ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - Piper Aircraft Inc. J3F-60S ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - Piper Aircraft Inc. J3F-65 (Army L-4D) ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - Piper Aircraft Inc. J3F-65S ([TCDS A-692](https://openairdocs.org/tcds/A-692)) - Piper Aircraft Inc. J3L ([TCDS A-698](https://openairdocs.org/tcds/A-698)) - Piper Aircraft Inc. J3L-65 (Army L-4C) ([TCDS A-698](https://openairdocs.org/tcds/A-698)) - Piper Aircraft Inc. J3L-65S ([TCDS A-698](https://openairdocs.org/tcds/A-698)) - Piper Aircraft Inc. J3L-S ([TCDS A-698](https://openairdocs.org/tcds/A-698)) - Piper Aircraft Inc. PA-11 ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - Piper Aircraft Inc. PA-11S ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - Piper Aircraft Inc. PA-18 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18-105 (Special) ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18-125 (Army L-21A) ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18A ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18A-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18A-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18AS-125 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18AS-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18AS-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18S ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18S-105 (Special) ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18S-125 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18S-135 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-18S-150 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-19 (Army L-18C) ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - Piper Aircraft Inc. PA-19S ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) ## 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. **14 CFR 21.120)** FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 1 OF 2 * Number: SA02579AK This certificate issued to: Installation of Swing bar on several Piper aircraft in accordance with Willow Mountain Ranch, Drawing No WMR-SWB-05 dated 10 August 2023 or later FAA approved revision. 1. Compatibility of this design change with previously approved modifications must be determined by the installer. The modification is only compatible with a standard width fuselage. 2. Existing instructions for continued Airworthiness are considered adequate for its modification. Willow Mountain Ranch HC 89 Box 100 Willow, AK 99688 Date of application: October 6, 2022 Date of issuance: December 21, 2023 Date reissued: for Gregory S. DiLibero Title: Manager, West Certification Branch Part 23 of Federal Aviation Regulations. *See attached FAA Approved Model List (AML), Document No. SA02579AK, Rev IR, or later FAA approved revisions for the list of approved airplane models, applicable installation data requirements and specific limitations. **14 CFR 21.120)** FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 2 OF 2 Number: SA02579AK Transfer Endorsement Transfer the ownership of Supplemental Type Certificate Number: SA02579AK ### SA02529AK_AML.pdf United States of America Department of Transportation - Federal Aviation Administration Willow Mountain Ranch Approved Model List (AML) HC 89 Box 100 Number: SA02529AK Willow, AK, 99688 Date of Issuance: Dec 21, 2023 Approved Model List for the Installation of Swing bar on several model narrow airframe cub aircraft. Aircraft Make Aircraft Model Type Certificate Number Required Approved Data and Added Models Specific Limitations AML Amendment Data Piper Aircraft, Inc. J3C-40, J3C-50, J3C- 50S, J3C-65, J3C-65S, PA-11, PA-11S A-691 Airplane Flight Manual Supplement: N/A Installation Drawing: WMR-SWB-05, IR dated 8/19/2023 or later FAA approved revision. Instruction for Continued Airworthiness: WMR-SWB-04, IR dated 8/19/2023 or later FAA accepted revision. Equipment Configuration: N/A Additional Limitations: None Additional Documents: None Piper Aircraft, Inc. J3F-50, J3F-50S, J3F- 60, J3F-60S, J3F-65 (army L-4D), J3F-65S A-692 Piper Aircraft, Inc. J3L, J3L-S, J3L-65 (Army L-4C), J3L-65S A-698 Piper Aircraft, Inc. PA-18, PA-18S PA-18 "105" (Special) PA- 18S "105" (Special) PA-18A PA-18 "125" (Army L-21A) PA-18S "125" PA-18AS "125" PA-18 "135" (Army L- 21B) PA-18A "135" PA-18S "135" PA-18AS "135" PA-18 "150" PA-18A "150" PA-18S "150" PA-18AS "150" PA-19 (Army L-18C) PA-19S 1A2 ## Every issue (1) - December 21, 2023: Issued, Current. [certificate](https://openairdocs.org/files/sha256/36/e9/36e9b7f9b4860d001bd78301170777a6854031159f08d90664feb18ac425b415), [SA02529AK_AML.pdf](https://openairdocs.org/files/sha256/4d/e8/4de83210609f877c0070cf6f06252989be6254069448e411205ea96b21af64e9) --- 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.