Electrical Power

The electrical power system provides the electrical power necessary to operate all the helicopter systems. It stores and generates the electrical power, uses the stored electrical power to start the engine, and distributes the electrical power to every system that requires it. It consists of the systems that follow:

• DC generation

• External power

• DC electrical load distribution

• Multipurpose equipment

DC generation

The DC generation provides the electrical power needed for starting and for normal operation of the helicopter. The stored electrical power is used to produce the high amount of current needed to start the engine. During normal operation, the electrical power used for starting the engine is replenished, ensuring that sufficient electrical power is always available. It also has a means of shutting off the electrical power to prevent it from being drained. It consists of the components that follow:

• Starter generator

• GEN switch

• Power feeder

• Battery

• BATT switch

• Battery vent tube

External power

The external power provides electrical power for starting the engine and for operation of the helicopter systems on the ground. Use of the external power system prevents depletion of the stored electrical power so it is available for starting and operating the helicopter. It consists of the external power receptacle.

DC electrical load distribution

The DC electrical load distribution distributes the electrical power to every helicopter system. It controls the switching between internal storage and external power, the use of the stored electrical power, the cranking and starting of the engine, the generation of electrical power, and it provides over-current protection. It also provides signals to the indicating/recording systems for the monitoring of its condition. It consists of the components that follow:

• Electrical Power System Unit (EPSU)

• Circuit breaker panel

• 28 VDC receptacle

Multipurpose equipment

The multipurpose equipment provides a junction location for electrical components of various systems. It consists of the relay panel.