General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

What functions are powered by the GRD handling bus?

1. Cabin lights and outlets

2. Fueling/defueling operations

3. Navigation system lights

4. Main battery charger

The correct answer is: Fueling/defueling operations

The correct choice highlights the specialized role of the Ground Handling (GRD) power bus, specifically in supporting fueling and defueling operations. This function is critical as it ensures that the systems responsible for transferring fuel to and from the aircraft have the necessary electric power to operate safely and efficiently. Fueling and defueling operations often require precise electrical management to engage pump systems and monitoring equipment, which ensures that the process adheres to safety regulations and operational guidelines. These activities are essential not just for the functionality of the aircraft but also for maintaining safety protocols during ground operations. While cabin lights and outlets, navigation system lights, and main battery chargers are important for different aspects of aircraft operation, they are typically not powered by the GRD handling bus. Instead, these systems may derive their power from different sources such as the aircraft's main electrical system or dedicated circuits designed for passenger and navigation support. By focusing specifically on the GRD handling bus, we see its critical application in facilitating the processes that are vital for efficient ground handling operations.