Figure 1-6.--Nosewheel steering system schematic.
Detailed instructions on reading orthographic, as well
in figure 1-4. Look at this figure and notice the
as all other types of drawings, are contained in
electrical symbols for fuse, splice, ground, and polarity.
Blueprint Reading and Sketching, NAVEDTRA 12014.
Figure 1-5 is a schematic diagram that shows an
arresting gear system. Different symbols in the legend
DIAGRAMS
indicate the flow of hydraulic fluid. The diagram also
indicates energized and nonenergized wires. Each
One of the more important factors in
component is illustrated and identified by name.
troubleshooting a system logically is your
Arrows indicate the movement of each component.
understanding of the components and how they operate.
You should study the information and associated
Block diagrams may be used to illustrate a system.
schematics provided in the MIM. The function of each
The nosewheel steering system in figure 1-6 is a good
component and possible malfunctions can be used in
example of the use of a block diagram.
the process of analyzing actual malfunction symptoms.
In the block diagram, each of the components of the
A primary concern in troubleshooting an aircraft
system is represented by a block. The name of the
hydraulic system is to determine whether the
component represented by each block is near that
malfunction is caused by hydraulic, electrical, or
block. Block diagrams are also useful in showing the
mechanical failure. Actuating systems are dependent
relationship of the components. They also may show
on the power systems. Some of the troubles exhibited
the sequence in which the different components
operate.
A pictorial drawing is a representation of both the
detail and the entire assembly. Figure 1-7 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.
Orthographic drawings are used to show details of
parts, components, and other objects, and are primarily
used by the manufacturer of the object. Usually, two or
more views of the object are given on the drawing.
Figure 1-7.--Pictorial drawing with exploded view.
1-9
