Which system is connected to the "Non-Essential" bus?

The "Non-Essential" bus is designed to power systems that are not critical for the safe operation of the aircraft. These systems are typically considered secondary and are not required for basic flight operations. An overhead blower serves to improve environmental conditions inside the aircraft, providing comfort to the crew and passengers, but it is not a system essential for the aircraft’s control or safety.

The starter, fuel pumps, and landing gear are essential systems that need to be operational for safe flight. The starter is crucial for initiating the engine operation, fuel pumps are necessary for engine fuel delivery, and the landing gear is vital for take-off and landing phases of flight. If any of these systems fail, it could compromise the aircraft's safety and operational effectiveness. Therefore, within this context, the overhead blower being connected to the "Non-Essential" bus aligns with its role as a comfort feature rather than a safety-critical component.