Look at this figure and notice the electrical symbols for fuse, splice, ground, and polarity. Figure 3-5 is a schematic diagram that shows an arresting gear system. Different symbols in the legend indicate the flow of hydraulic fluid. The diagram also indicates energized and nonenergized wires. Each component is illustrated and identified by name.
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.