How does humidity affect the longevity of wood in aircraft structures?

Humidity has a significant impact on the longevity of wood used in aircraft structures. When wood is subjected to high humidity levels, it absorbs moisture, leading to various issues that can ultimately shorten its lifespan. The increased moisture content can cause the wood to swell, warp, or rot, compromising its structural integrity.

Additionally, high humidity creates an environment conducive to the growth of fungi and mold, which further deteriorates the material. Prolonged exposure to moisture can also lead to the breakdown of adhesives used in the composite structures, further weakening the overall integrity.

In contrast, a lack of adequate humidity can lead to wood drying and cracking, but in the context of this specific question, the cumulative negative effects of high humidity are more pronounced. Hence, recognizing the adverse effects of humidity on wood helps in understanding its selection and treatment in aviation applications to ensure safety and durability.