What does a musty odor during inspection suggest about the wood?

A musty odor during inspection is a strong indicator of mold or decay in the wood. This smell typically arises from fungal growth that thrives in moist environments, suggesting that the wood has been exposed to damp conditions. Mold or decay can compromise the structural integrity of the wood, making it essential to address these issues before safety and performance can be assured in aviation contexts.

While chemical treatments may sometimes affect the wood's odor, they generally do not result in a musty smell. Recent staining might also change the wood's appearance, but it wouldn’t produce a musty odor typical of mold. Dryness and aging usually lead to other types of odors rather than the musty scent associated with biological growth. Thus, detecting a musty odor is a clear sign that mold or decay is present, indicating a need for further inspection and remediation.