Arrows indicate the movement of each component. Block diagrams may be used to illustrate a system. The nosewheel steering system in figure 3-6 is a good example of the use of a block diagram. In the block diagram, each of the components of the system is represented by a block. The name of the component represented by each block is near that block.
Block diagrams are also useful in showing the relationship of the components.
They also may show the sequence in which the different components operate. A pictorial drawing is a representation of both the detail and the entire assembly. Figure 3-7 is an example of a pictorial drawing. Another use of this type of drawing is to show disassembly, or an exploded view. This type of drawing enables the mechanic to see how the parts of a particular piece of equipment are put together.