PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

What powers ignition A in the AC essential bus system?

1. Generator Bus

2. Battery Bus

3. Static Inverter

4. External Power

The correct answer is: Battery Bus

In the AC essential bus system of the PSA Airlines Canadair Regional Jet, ignition A is powered by the battery bus. The battery bus provides electrical power when other sources, such as generators or external power, are unavailable or offline. This is especially important during situations like engine start-up or when there is a failure in the generator bus system. The battery bus ensures that critical systems, including ignition A, can still operate, maintaining aircraft safety and functionality. The generator bus typically draws power from the aircraft's generators, while the static inverter converts DC power into AC power for various systems. External power refers to ground power sources connected when the aircraft is on the ramp, but in many operational scenarios, especially during start-up or electrical system failures, the battery bus plays a crucial role. Understanding the reliance on the battery bus for critical systems helps solidify the operational knowledge needed for effective aircraft management and safety.