STC SA01841SE

Number SA01841SE

This certificate, issued to Merlyn Products, Inc.

7500 West Park Drive Spokane, WA 99224

Part 3 of the Civil Air Regulations.

Original Product⎯Type Certificate Number: 6A1 Make: Twin Commander Model: 500A

Description of the Type Design Change: : Installation of Teledyne Continental engines modified in accordance with STC SE01840SE, and increase the maximum gross weight to 7400 pounds. The installation must be performed in accordance with Merlyn Products Installation Instructions MPI Report 37-35-01, Rev. B, dated February 19, 2008, or later FAA-approved revision to this document.

Limitations and Conditions: Approval of this change in type design applies to the above model only. This approval should not be extended to aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationships between this change and any of those other previously approved modifications including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft.

The modified aircraft must be maintained in accordance with Section 9 of MPI Report 37-35-01, Rev. B, dated February 19, 2008, or later FAA-approved revision to this document.

A copy of this certificate and Airplane Flight Manual supplement 37-35-AFMS Revision N/C, dated May 8, 2008, shall 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: August 8, 2007 Date reissued:

Date of issuance: May 12, 2008 Date amended:

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)