> For the complete documentation index, see [llms.txt](https://bell-505-guide.gitbook.io/bell-505-maintenance-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bell-505-guide.gitbook.io/bell-505-maintenance-guide/system-descriptions/electrical-systems/electrical-power.md). # 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. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://bell-505-guide.gitbook.io/bell-505-maintenance-guide/system-descriptions/electrical-systems/electrical-power.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.