How are repaired areas identified after blending?

• A. Covering the blend with a felt tip dye marking material or similar solution to identify it as a reworked area
• B. Engraving a mark on the blade with a stamp
• C. Painting with primer to indicate rework
• D. Marking with a pencil or chalk

Answer: (A)

After blending, it’s essential to clearly mark where material was removed so inspectors can recognize the reworked area during future maintenance. The best way to do this is to apply a felt-tip dye marking material or a similar solution across the blended zone. This type of marking is visible through cleaning and handling, easy to refresh if needed, and does not alter the surface finish or dimensions of the blade. It provides a clear, non-invasive indication of the rework that stays reliable through inspections.

Engraving a mark with a stamp would introduce a permanent groove that could become a stress riser or affect the blade’s aerodynamic surface. Painting with primer can obscure the area or be mistaken for corrosion treatment, and may not remain visible or durable through service. Marking with pencil or chalk can rub off or smear, making the reworked area hard to detect later.