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12 cards from this deck
Non-destructive testing - finds flaws without damaging components
Cracks, voids, inclusions
Parts under extreme stress need integrity over many flight hours
Highlights surface cracks difficult to see with naked eye
Liquid penetrates surface cracks via capillary action
Clean material - remove oil, grease, dirt particles
Spray liquid dye over surface - penetrates into cracks
Wipe excess liquid away, leaving dye only in cracks
Apply developer spray - draws dye from cracks for contrast
Inspect flaws - decide to repair, replace, or leave component
UV sensitive penetrant glows under UV lamp in dark room
Better visibility of small defects
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