NDI Airmen find defects invisible to the naked eye

Airman 1st Class Kale McSpadden, 2nd Maintenance Squadron non-destructive inspection apprentice, dips an aircraft part into a fluorescent penetrant on Barksdale Air Force Base, La., Sept. 19, 2013. This process checks for cracks and other structural damage on the surface of an aircraft part or piece of equipment. The fluorescent penetrant seeps into the defect and takes around 30 minutes to completely identify it. (U.S. Air Force photo/Senior Airman Benjamin Gonsier)

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