Explain the difference between dye penetrant and magnetic particle inspections and when they are used in gas turbine maintenance.

• A. Dye penetrant detects surface-breaking cracks in non-porous materials; magnetic particle detects surface and near-surface defects in ferromagnetic materials. Both are used for blade roots, housings, and structural components depending on material.
• B. Dye penetrant detects underground cracks; magnetic detects color
• C. Dye penetrant detects porosity; magnetic detects conductivity
• D. Dye penetrant tests magnetic properties

Answer: (A)