# STC SA615NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: McHugh Aviation Inc, United States - Description: Installation of Lycoming GO-435-C2B, GSO-IGSO-480 series, and GO-IGO-480 series engine with Hartzell HC-A2V20 and HC-A3VF series propellers; new nacelle and engine mount; modified front and rear spar and aft firewall; and associated systems. - Applied: November 14, 1975 - Status date: June 25, 2004 - Product: Aircraft, Single-Engine - Certification basis: Part 3, Part 21 - Data sheets: [TCDS A-769](https://openairdocs.org/tcds/A-769) - Certificate PDF: https://openairdocs.org/files/sha256/9a/c0/9ac0b22476c23978ff56c4c2ae202e2a6a93c15a7c8f9d173e99a9c19fadf754 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2FF52A6ED4FBFA1A86256EE6004AA399.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA615NW ## ADs that name it (0) None. ## Approved models (1) - Sky Enterprises Inc. RC-3 ([TCDS A-769](https://openairdocs.org/tcds/A-769)) ## What the certificate says Some pages are OCR from the scanned FAA certificate. OCR can misread letters and numbers. Number: SA615NW This certificate issued to: McHugh Aviation, Inc. 3763 Image Drive Anchorag e, AK 99504 Part 3 of the Civil Air Regulations. Original Product Type Certificate Number: A-769 Make: Republic Model: RC-3 Description of Type Design Change: Installation of Lycoming G0-435-C2B, GS0/IGS0-480 series and G0/IG0-480 series engines; Hartzell HC-A2V20 and HC-A3VF series propellers; new nacelle and engine mount; modified front and rear spar and aft firewall; and associated systems in accordance with Simuflight, Seattle Modification Procedures No. SS-110 and Drawing No. SS-1000, Rev. A. These documents shall be maintained as part of the permanent records for the modified aircraft. This change includes increased takeoff gross weight to 3250 lbs. Limitations and Conditions: The 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 on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate, Addendum SA615NW, and Simuflight, Seattle Approved Airplane Flight Manual Supplement must be maintained as part of the permanent records of 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: November 14, 1975 Date reissued: June 25, 2004 Date of Issuance: December 29, 1978 Date amended: 2/28/92; 6/25/04 (Signature) Acting Manager, Seattle Aircraft Certification Office (Title) ## Every issue (1) - June 25, 2004: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/9a/c0/9ac0b22476c23978ff56c4c2ae202e2a6a93c15a7c8f9d173e99a9c19fadf754) --- 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.