What does the Start Bus primarily provide?

The Start Bus primarily provides power to start the aircraft's engines. During the engine start sequence, the Start Bus is essential as it delivers the necessary electrical energy to the starter motors. These motors are responsible for initiating the engine's combustion process, making it crucial for successful engine startups. The Start Bus typically draws power from the aircraft's battery or external power sources, ensuring that there is adequate energy available at the right moment for engine ignition and operation. This function is vital for the aircraft's overall operation and safety, as without a reliable power source for engine starting, the aircraft would not be able to initiate flights.