Schematic Diagrams

Schematic diagrams can be found in maintenance manuals to give information on aircraft systems such as electrical, hydraulic, pneumatic, lubrication, air-conditioning, and pressurisation. They also provide details for engine and propeller operation.

Coloured diagrams are not used in maintenance manuals, but a system of hatching and shading is normally used to indicate how the system functions.

A typical electrical system schematic diagram is used to provide an overview of the complete aircraft system so that maintenance and diagnosis can be initiated. The diagram may show sources of electrical power and the distribution of that power to a wide range of bus-bars. Each sub-system would have an additional diagram, showing the circuits in detail from those bus-bars.

FIGURE