Certified Inspection Service, LLC was organized in 1997 and purchased by MME, LLC in 2003. As part of the purchase of Metals, Materials Engineering, Durham Holdings purchased CIS in May 2014. CIS is devoted exclusively to providing nondestructive testing (NDT) for the general aviation industry. CIS is an FAA approved repair station for NDT testing – certification number X18R997N. Certain privately owned aircraft require re-certification after a set number of flight hours.