For extending the life of aircraft components at reasonable cost, repair of metallic aircraft parts is made instead of replacing damaged parts. The two primary repair methods are Bonded Repair and Mechanically Fastened Repair [2]. Both types of repairs have their pros and cons, but The Bonded Repair technology has considerable advantages over the other, such as high stiffness, light weight, corrosion resistance and installation without causing additional damages. By selecting Bonded Repair method, patch and adhesive material selection, patch design, surface preparations and pre/post repair flaw inspection are major factors which must be considered [3]. Each of these steps is based on some criteria.