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Don Gough, 80th Flying Training Wing Non-destructive Inspection lead maintainer, looks at an aircraft part under a black light July 26 to look for defects. The fluorescent penetrate is one of five techniques used by specialists to search for cracks or other defects in aircraft parts or airframes. The shop also uses ultrasound, magnetic particle, eddy current and X-ray. (U.S. Air Force photo/Mike Litteken
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