# STC SA04121CH - Type: Supplemental type certificate - Status: Current, Amended - Holder: Svenn s Aviation LLC, United States - Description: Installation of Lycoming 0-320 engine - Applied: February 24, 2015 - Status date: February 26, 2018 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS 1A2](https://openairdocs.org/tcds/1A2), [TCDS 1A4](https://openairdocs.org/tcds/1A4), [TCDS 1A6](https://openairdocs.org/tcds/1A6) - Certificate PDF: https://openairdocs.org/files/sha256/8d/14/8d14d9e625dae3aca689851d3d27db15a2a4db92adf3c9efb2b00f923ee6f3a3 - Approved model list and other attachments: [SA04121CH_AML.pdf](https://openairdocs.org/files/sha256/5a/25/5a2522d243a8da46788f71dedd5831047766eaf9961cd9025d4953e394ab976b) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FA8343C35C89B7B88625824B004D4566.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA04121CH ## ADs that name it (0) None. ## Approved models (32) - 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)) - Piper Aircraft Inc. PA-20 ([TCDS 1A4](https://openairdocs.org/tcds/1A4)) - Piper Aircraft Inc. PA-20-115 ([TCDS 1A4](https://openairdocs.org/tcds/1A4)) - Piper Aircraft Inc. PA-20-135 ([TCDS 1A4](https://openairdocs.org/tcds/1A4)) - Piper Aircraft Inc. PA-20S ([TCDS 1A4](https://openairdocs.org/tcds/1A4)) - Piper Aircraft Inc. PA-20S-115 ([TCDS 1A4](https://openairdocs.org/tcds/1A4)) - Piper Aircraft Inc. PA-20S-135 ([TCDS 1A4](https://openairdocs.org/tcds/1A4)) - Piper Aircraft Inc. PA-22 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - Piper Aircraft Inc. PA-22-108 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - Piper Aircraft Inc. PA-22-135 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - Piper Aircraft Inc. PA-22-150 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - Piper Aircraft Inc. PA-22-160 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - Piper Aircraft Inc. PA-22S-135 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - Piper Aircraft Inc. PA-22S-150 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - Piper Aircraft Inc. PA-22S-160 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) ## 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. Installation of Lycoming 0-320 engine in accordance with Svenn’s Aviation Installation Instructions as listed on AML SA04121CH. 1. The installer must determine whether this design change is compatible with previously approved modifications. 2. A copy of this Certificate and FAA Approved Model List (AML) No. SA04121CH, reissued January 4, 2018, or later FAA approved revision, must be maintained as part of the permanent records for the modified aircraft. 3. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other pers on written evidence of that permission. Svenn's Aviation LLC. N6710 370th St. Menomonie, WI 54751 * See attached FAA Approved Model List (AML) No. SA04121CH for list of approved airplane models and applicable airworthiness regulations. February 24, 2015 June 28, 2017 February 26, 2018 (Signature) Roy E Boffo, III Manager Propulsion and Program Management Section, Chicago ACO Branch, Compliance & Airworthiness Division (Title) ### SA04121CH_AML.pdf FAA APPROVED MODEL LIST (AML) NO. SA04121CH SVENN'S AVIATION LLC. FOR INSTALLATION OF LYCOMING 0-320 Issue Date: June 28, 2017 Page 1 of 2 **INSTALLATION** **INSTRUCTIONS** **ITEM** **AIRCRAFT MAKE** **AIRCRAFT MODEL** **ORIGINAL TYPE** **CERTIFICATE NUMBER** **CERTIFICATION BASIS FOR** **ALTERATION** **INSTALLATION** **INSTRUCTIONS** **REVISION NO.** **AND DATE** AFM **SUPPLEMENT** **NUMBER/DATE** AML AMENDMENT DATE 1 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 CAR 3 Amendments listed in TCDS No. 1A2 SA-1300 Revision Org, dated June 27, 2017, or later FAA approved revisions SA-1302, Revision Org., May 25, 2016 or later FAA approved revision January 31, 2018 2 Piper Aircraft Inc. PA-20, PA-20 “115”, PA-20S, PA-20S “115”, PA-20S “135”, PA-20 “135” 1A4 CAR 3 Amendments listed in TCDS No. 1A4 SA-1400 Revision Org, dated May 22, 2017, or later FAA approved revisions SA-1402, Revision Org., Dated December 18, 2017 or later FAA approved revision January 31, 2018 3 Piper Aircraft Inc. PA-22, PA-22-135, PA-22S-135, PA-22- 150, PA-22S-150, PA- 22-160, PA-22S-160, PA-22-108 1A6 CAR 3 Amendments listed in TCDS No. 1A6 SA-1400 Revision Org, dated May 22, 2017, or later FAA approved revisions SA-1402, Revision Org., Dated December 18, 2017 or later FAA approved revision January 31, 2018 FAA APPROVED MODEL LIST (AML) NO. SA04121CH SVENN'S AVIATION LLC. FOR INSTALLATION OF LYCOMING 0-320 Issue Date: June 28, 2017 Page 2 of 2 FAA Approved: ___________________________ __________ Roy E Boffo, III Manager Propulsion and Program Management Section, Chicago ACO Branch, Compliance & Airworthiness Division Reissued: Amended: January 31, 2018 ## Every issue (2) - February 26, 2018: Amended, Current. [certificate](https://openairdocs.org/files/sha256/8d/14/8d14d9e625dae3aca689851d3d27db15a2a4db92adf3c9efb2b00f923ee6f3a3), [SA04121CH_AML.pdf](https://openairdocs.org/files/sha256/5a/25/5a2522d243a8da46788f71dedd5831047766eaf9961cd9025d4953e394ab976b) - June 28, 2017: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/3a/32/3a326561a8821cf17f84fce71126857e9aca1dd5daf78087d5b46c0386ef68a2) --- 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.