What is a primary concern when using wood in aviation structures?

The primary concern when using wood in aviation structures focuses on its susceptibility to environmental factors. Wood is a natural material that is significantly affected by moisture, temperature changes, and other environmental conditions. For instance, exposure to humidity can cause wood to swell or warp, while dry conditions can lead to cracking. Additionally, wood is vulnerable to biological factors such as fungi and insects, which can compromise its structural integrity over time.

In the context of aviation, where safety and performance are paramount, the ability of wood to withstand varying environmental conditions becomes crucial. Any weakening of the material can directly impact the performance and safety of the aircraft, leading engineers and designers to approach the use of wood with caution.

While the other factors mentioned—cost of production, strength-to-weight ratio, and market availability—are indeed important considerations in materials selection for aviation, they do not have the same immediate and dramatic implications on the physical safety and reliability of the aircraft as the environmental susceptibility of wood does. Such environmental concerns necessitate rigorous treatment and maintenance protocols when using wood in aviation applications.