True or False: It is advisable to re-drill previously drilled holes.

Re-drilling previously drilled holes is generally not advisable because it can weaken the structural integrity of the material and lead to various complications. When a hole is drilled, the surrounding material undergoes changes that can affect its strength and load-bearing capabilities. This is particularly critical in aerospace applications where safety and adherence to strict engineering standards are paramount.

While there can be exceptions based on specific circumstances — such as minor adjustments or corrections in certain materials — the standard practice is to refrain from re-drilling unless explicitly permitted by engineering guidelines. The integrity of the assembly is crucial, as aerospace components must endure rigorous stress and operational conditions. Therefore, the answer highlights the importance of maintaining tight tolerances and the potential risks associated with altering previously drilled holes.