A method of scanning comprises detecting a document on a scanning device scanning surface, and detecting pressure on the scanning device scanning surface to scan a region of the document. The binder-resin content decreases in order from the primer layer to the topcoat layer. The avionics maintenance training device includes actual avionics components and non-functional and functional physically replicated avionics components of the actual aircraft. One or more of the bus controllers may be configured to read information that uniquely identifies each system or blade.