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

Which components are powered by the GRD SVC bus?

1. Cargo doors and lights

2. Main battery charger and APU battery charger

3. Fuel pumps and elevators

4. Navigation systems

The correct answer is: Main battery charger and APU battery charger

The GRD SVC bus is primarily responsible for providing electrical power to vital components on an aircraft. The correct choice identifies the main battery charger and APU (Auxiliary Power Unit) battery charger as components powered by this bus. This is important because the main battery charger ensures that the aircraft's main battery is kept charged and ready for use, while the APU battery charger supports the APU, which is crucial for providing power and air conditioning when the main engines are not operating. Understanding the role of the GRD SVC bus in providing power to these components highlights its significance in aircraft operations. Keeping the battery systems charged ensures that the aircraft can operate reliably and maintain functionality for essential systems, especially during ground operations or when the aircraft is not in flight. Other components listed, such as cargo doors and lights, fuel pumps and elevators, or navigation systems, are powered by different systems or buses designed for those specific functions. Their reliance on alternate power sources emphasizes the specialized role of the GRD SVC bus in supporting the charging systems necessary for overall electrical supply stability on the aircraft.