STC SA02589AK

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate 14 CFR 21.120) FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 1 OF 3 Number: SA02589AK This certificate issued to:

Description of Type Design Change: Installation of the Hartzell Model 3C1-R430A1/80C01 Propeller on Aviat A-1, A-1A, A-1B, A-1C-180, A-1C-200 Aircraft in accordance with Document No. 61-24170- 39-01 Revision A, dated December 6, 2024, Installation Instructions, Hartzell 3C1-R430Al/80C01 Propeller On Aviat A-1, A-1A, A-1B, A-1C Aircraft, or later FAA approved revision.

1. Operation must be in accordance with Airplane Flight Manual Supplement (AFMS) for Aviat Husky model A-1, A-1A, A-1B, A-1C-180, A-1C-200 Models with Hartzell 3C1-R430A1/80C01 Propeller, document number 61-24170-25-01, AFMS, Aviat Husky with Hartzell 80C01 Prop Rev IR, dated January 21, 2025, or later FAA approved revision.

2. For Instruction for Continued Airworthiness refer to Instructions for Continued Airworthiness Aviat A-1, A-1A, A-1B, A-1C Aircraft with Hartzell 3C1-R430A1/80C01 Propeller, Document Number 61-24170-24-01, Revision N/C, dated December 6, 2024, or later FAA approved revision.

3. The installer must determine whether this design change is compatible with previously approved modifications.

(Continued on page 3 of 3)

Momentum Aeronautics Holdings, LLC 500 L Street, Suite 200 Anchorage Alaska, 99501 Original Product Type Certificate Number: A22NM Make: Aviat Aircraft Inc.

Model: A-1, A-1A, A-1B, A-1C-180, A-1C-200 Date of application: June 6, 2024 Date of issuance: January 31, 2025 Date reissued:

for Gregory S. DiLibero Title: Manager, West Certification Branch Part 23 of Federal Aviation Regulations.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate 14 CFR 21.120) FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 2 OF 3 Number: SA02589AK

Transfer Endorsement Transfer the ownership of Supplemental Type Certificate Number: SA02589AK To (Name and address of transferee):

14 CFR 21.120)

FAA Form 8110-2 (06/20) SUPERSEDES PREVIOUS EDITION PAGE 3 OF 3

(Continuation Sheet) Date of application: June 6, 2024 Date of issuance: January 31, 2025 Date reissued:

Number: SA02589AK

Limitations and Conditions: (Continued from Page 1 of 3)

4. The installation of this propeller requires that 8.50 X 6 (or larger) tires be installed to achieve adequate propeller ground clearance. See aircraft Type Certificated Data Sheet A22NM Notes 13 and 14 for tire types that are currently approved that meet this size criteria.