Which factors may need to be noted in a bill of materials?

The factors that should be noted in a bill of materials (BOM) are fundamental to understanding the components of an assembly. Composition refers to the material or materials that make up a part, which is crucial for ensuring that components meet safety, performance, and regulatory standards. Size is equally important; it determines how components fit together and affect the overall dimensions of the assembly. Accurate representation of both composition and size in the BOM allows engineers, designers, and assembly personnel to manage materials effectively and ensure that the parts are suitable for their intended function within the aircraft.

While other options mention valid characteristics of parts, they are not as critical for a BOM. For instance, color and texture, while relevant for aesthetic purposes, typically do not impact the functional assembly of components. Size is mentioned in two options, but the inclusion of composition alongside it in the correct choice emphasizes the importance of material properties in aerospace applications. Brand and model, while useful in some contexts, do not directly pertain to the physical properties of the components themselves in a BOM context. Therefore, the combination of composition and size is crucial for thoroughly understanding and executing assembly processes.