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

What distinguishes the GRD Service BUS from the GRD Handling BUS?

1. The Service BUS can only work in flight

2. The Handling BUS operates in flight

3. The Service BUS can be powered on ground and in flight

4. The Handling BUS powers inflight systems

The correct answer is: The Service BUS can be powered on ground and in flight

The correct answer highlights a key distinction between the two types of buses. The Service BUS is designed to operate both on the ground and in flight, allowing it to support various aircraft services regardless of the aircraft's phase of operation. This versatility is important for maintaining systems that need to be functional at all times, such as communication or navigation systems. In contrast, the Handling BUS is typically restricted to specific operations and may not support the same range of functions as the Service BUS when it comes to ground operations or the inflight condition. This difference in operational capability is critical for understanding how aircraft systems are managed and powered during different phases of flight and ground operation. The other options indicate limitations or attributes that do not accurately define the functionalities of these buses. For example, stating that the Handling BUS operates in flight misrepresents its intended role, as it does not have the same comprehensive operational scope as the Service BUS. The focus of the distinctions is essential for ensuring proper usage and understanding of aircraft systems.