# STC SA4135NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Air Mods NW, United States - Description: Install Lycoming 0-235-L2C/L2A(M) engine (modified per STC SE792NW) and Sensenich 72CK-0-52/57 propeller. - Applied: December 12, 1986 - Status date: August 20, 2019 - Product: Aircraft, Small Airplane - Certification basis: Part 21, Part 23 - Data sheets: [TCDS A18SO](https://openairdocs.org/tcds/A18SO) - Certificate PDF: https://openairdocs.org/files/sha256/0b/1d/0b1d8d321fd9df59795bac6c897b6b3932825d33a076fc71eb1b6144e39f1607 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AA560CCC4906FB6F862585DE00399DFA.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA4135NM ## ADs that name it (0) None. ## Approved models (1) - Piper Aircraft Inc. PA-38-112 ([TCDS A18SO](https://openairdocs.org/tcds/A18SO)) ## 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 This certificate has been reissued to replace the original certificate reported lost Number SA4135NM This certificate, issued to Air Mods N.W. 1424 Ridge Ave Snohomish, WA 98290 Part 23 of the Federal Air Regulations, effective February 14, 1975 Original Product Type Certificate Number: A18S0 Make: Piper Model: PA-38-112 Description of the Type Design Change: Installation of a Lycoming 0-235-L2C/L2A(M) engine (modified per STC SE792NW) and Sensenich 72CK-0-52/57 propeller, in accordance with Air Mods N.W. Installations Instructions KD238, dated 9/16/87. Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of this model series unless the installer determines that the relationship between this change and any other previously incorporated approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate and FAA Approved Pilots Operator Handbook Supplement dated October 30, 1987, or later FAA approved revision, must be maintained as part of the permanent records for the modified aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. Date of application: December 12, 1986 Date reissued: August 20, 2019 Date of issuance: October 30, 1987 Date amended: FAA FORM 8110 2 (5/14) PAGE 1 OF 3 PAGE By direction of the Administrator (Signature) Manager, Seattle ACO Branch (Title) 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) Signature of Grantor (In Ink): PAGE 2 OF 3 PAGES 1U.S. GPO: 1987-763-289 United States of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) This certificate has been reissued to replace the original certificate reported lost Number SA4135NM LIMITATIONS AND CONDITIONS: The conditions and limitations of Type Certificate Data Sheet (TCDS) Number A18S0 apply except where superseded by the following; This Supplemental Type Certificate Data Sheet, which is part of the STC SA4135NM, prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Federal Air Regulations. SUPPLEMENTAL TYPE CERTIFICATE HOLDER: AIR MODS N.W. Model PA-38-112 (Normal/Utility Category) as modified by STC SA4135NM Engine: Lycoming 0-235-L2c/L2A (M) per STC SE792NW Fuel: 100/100LL Engine Limits: 125 HD @ 2800 RPM Propeller: Sensenich 72CK-0-52 thru -57 Propeller Limits: Static RPM at maximum permissible throttle setting: Not Above Not Below 72CK-0-52 2530 2380 72CK-0-53 2510 2360 72CK-0-54 2490 2340 72CK-0-55 2470 2320 72CK-0-56 2450 2300 72CK-0-57 2430 2280 - END - **FAA FORM 8110-2 (5/14) PAGE 3 OF 3 PAGES** ## Every issue (2) - August 20, 2019: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/0b/1d/0b1d8d321fd9df59795bac6c897b6b3932825d33a076fc71eb1b6144e39f1607) - October 30, 1987: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/4f/dd/4fdd589805c6ae9377a2687e9d993e59893edf6aaf054afe792a274ff18fb985) --- 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.