Dye penetrant inspection is a good method to locate cracks in the bead seat area of an aircraft wheel.

• A. True
• B. Not applicable
• C. False
• D. Only for certain wheel sizes

Answer: (C)

Dye penetrant inspection works best for surface-breaking flaws that are open to the surface and easily accessible for the penetrant to enter. The bead seat area of an aircraft wheel is a curved, tight, high-stress region where cracks are often tight, subsurface, or oriented in ways that are not readily opened to the surface. In such geometries, penetrant fluid may not enter or reveal the flaw reliably, and residues from tire contact, scale, or coatings can mask indications. For these reasons, DPI is not considered a reliable method for locating bead seat cracks. In practice, methods like magnetic particle inspection or other techniques that can detect tight or subsurface flaws in this complex area are preferred.