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Wiring Diagrams and Wire Types – Aircraft Electrical System | Part 01

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Wiring Diagrams

Electrical wiring diagrams are included in most aircraft service manuals and specify information,
Such as the size of the wire and type of terminals to be used for a particular application. Furthermore, wiring diagrams typically identify each component within a
System by its part number and its serial number,
Including any changes that were made during the production run of an aircraft.
Wiring diagrams are often used for troubleshooting electrical malfunctions.

Block Diagrams

A block diagram is used as an aid for troubleshooting complex electrical and
Electronic systems.
A block diagram consists of individual blocks that represent several components,
Such as a printed circuit board or some other type of replaceable module. A block diagram provides a quick,
High-level view of a system to rapidly identify points of interest or trouble spots.

Because of its high-level perspective,
It may not offer the level of detail required for more comprehensive planning or implementation. A block diagram will not show every wire and switch in detail,
That’s the job of a circuit diagram. Figure 1 is a block diagram of an aircraft electrical system.

Figure 1. Block diagram of an aircraft electrical system

Pictorial Diagrams

In a pictorial diagram,
Pictures of components are used instead of the conventional
Electrical symbols found in schematic diagrams. A pictorial diagram helps the maintenance technician visualize the operation of a system. The pictorial diagram is a
Picture or sketch of the components of a specific system and;
The wiring between these components. This simplified diagram identifies components,
Even if you are not familiar with their appearance. This type of diagram does not show physical locations of
Components or how the wiring is marked or routed. [Figure 2]

Figure 2. Pictorial diagram of an aircraft electrical system

Schematic Diagrams

A schematic diagram is used to illustrate a principle of operation,
And therefore does not show parts as they appear or function. [Figure 3] However, schematic diagrams do indicate the location of components with
Respect for each other. Schematic diagrams are best utilized for troubleshooting.

Figure 3. Schematic diagram

Click to read:

Aircraft Wire Types – Aircraft Electrical System | Part 02

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