See the following main steps in a fluorescent penetrant inspection process:

Fluorescent penetrant inspection is used to find cracks and other defects on the surface of a part.

Fluorescent penetrant inspection, a process for finding defects in non-porous materials.

The gas penetrates smaller openings than the liquids used in dye penetrant inspection and fluorescent penetrant inspection.

Between replacements, parts are subject to frequent inspections utilizing visual as well as chemical methods such as fluorescent penetrant inspection to detect weak parts before they fail completely.

Fluorescent Penetrant Inspection (FPI) processing results in a component whose surface contains "indications", these are due to fluorescent dye becoming entrapped into surface discontinuities during the multistage processing.

Fluorescent penetrant inspection (FPI) is a type of dye penetrant inspection in which a fluorescent dye is applied to the surface of a non-porous material in order to detect defects that may compromise the integrity or quality of the part in question.

After a total investigation, the NTSB determined the most probable cause of the accident was a fracture in the left engine's front compressor fan hub, which resulted from failure of the airline's fluorescent penetrant inspection process to detect a potentially dangerous crack in the fan which originated from the engine's initial manufacture.