Exhibit 3.6

State of Delaware

Secretary of State

Division of Corporations

Delivered 03:39 PM 05/11/2007

FILED 03:39 PM 05/11/2007

SRV 070554127 – 3968140 FILE

CERTIFICATE OF AMENDMENT

TO

CERTIFICATE OF FORMATION

OF

MELROSE US 3 LLC

Pursuant to Section 18-202 of the

Delaware Limited Liability Company Act.

1. The name of the limited liability company is Melrose US 3 LLC (the “Company”).

2. The Certificate of Formation of the Company is hereby amended to change the name of the Company to McKechnie Aerospace US LLC.

3. Accordingly, Article First of the Certificate of Formation shall, as amended, read as follows:

“First: The name of the limited liability company (hereinafter called the “Company” is McKechnie Aerospace US LLC.”

IN WITNESS WHEREOF, the undersigned authorized person has executed this Certificate of Amendment this 11^th day of May, 2007.

/s/ Bruce E. Graben

Name: Bruce E. Graben

Title: Authorized Person

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