What is the main function of the RAT in the Embraer Regional Jet?

The main function of the Ram Air Turbine (RAT) in the Embraer Regional Jet is to provide power to the AC essential bus. This is crucial during emergencies or when the aircraft's main power sources are not available. The RAT deploys in response to certain failures, such as an engine failure or loss of electrical power, and generates hydraulic and electrical power using the airstream created by the forward motion of the aircraft. By supplying power to the AC essential bus, the RAT ensures that vital systems remain operational to facilitate safe control of the aircraft and provide essential services during abnormal situations.

Charging the main batteries is not the RAT’s primary function, nor does it directly support the DC essential bus, which operates on a separate system. Additionally, the RAT does not serve as a cooling system for electronic systems; its primary focus is on providing emergency electrical power. Understanding the RAT's role in maintaining operational integrity during emergencies highlights its importance in the overall safety management of the aircraft.