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Experiences in testing a fleet of aging aircraft using an acoustic nondestructive testing technique

We are engaged in the testing of a 22 ship fleet of 25 - 30 year old aging aircraft using an advanced acoustic nondestructive technique. The purpose of our testing is to provide real-time detection of structural defects anywhere within the entire pressure hull of the aircraft as they are pressurized to 12 psig, in order to prevent catastrophic failure and potential loss of the aircraft. Periodic proof pressurization is a requirement of the regulatory authority for the aircraft, and is a condition for continued airworthiness certification.