True or False: Scrap material for checking countersink tools should match the composition and thickness of the finished assembly.

The statement is true because using scrap material that matches the composition and thickness of the finished assembly is essential for accurate and reliable checks on countersink tools. This practice ensures that the countersink depth and angle are measured correctly, allowing for a better fit of the fasteners in the assembly. When the scrap material mirrors the actual material used in the assembly, the results of the checks directly correlate to how the countersinking will perform in the final product. This consistency is critical in aerospace manufacturing, where precision and adherence to specifications are paramount to maintain safety and performance standards. Selecting materials that differ significantly in composition or thickness could lead to erroneous assessments of the tooling, ultimately affecting the integrity of the assembly process.