What method can be used to determine if dark spots in a wooden spar are acceptable damage?

The method that effectively determines if dark spots in a wooden spar signify acceptable damage involves probing the area with a sharp metal tool. This approach allows the inspector to assess the integrity of the wood beneath the surface. By probing, you can check for soft spots, rot, or any degradation that may not be visible through a simple visual inspection.

Dark spots may indicate moisture intrusion, fungal growth, or other forms of decay that compromise the structural integrity of the spar. A sharp metal tool can reveal hidden issues, such as soft or compromised wood, which could be critical for safe operation.

While the other methods have their purposes—like the coin tap test, which might help determine resonant sounds that could indicate structural weaknesses, or visual inspection that seeks to identify obvious signs of damage—probing provides a more definitive assessment of the underlying condition of the wood.