What is the maximum permissible grain deviation in aircraft wood?

The maximum permissible grain deviation in aircraft wood is established to ensure the structural integrity and performance of wooden components. A deviation of up to 15 degrees is accepted because it allows for flexibility in the wood's manufacturing and handling while still maintaining sufficient strength and predictability in performance. Beyond this limit, the risk of reducing the mechanical properties and overall durability of the wood increases, which could compromise safety in aviation applications.

In aircraft construction, where the material must endure various stresses, adhering to the guideline of a maximum grain deviation of 15 degrees helps ensure that the wood retains its strength and resilience, crucial factors for reliable performance in flight. This standard reflects an understanding of wood behavior under load and the need to follow precise engineering principles in aviation material specifications.