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

In flight, when will the AC Utility buses automatically load-shed?

1. When battery power is low

2. Upon landing

3. Never

4. During engine start

The correct answer is: Never

The AC Utility buses are designed to provide power to various electrical systems on the aircraft while managing the load on the electrical system effectively. They will automatically load-shed in response to specific conditions to maintain proper operation. While it may seem plausible to think that the buses would shed load during situations like engine starting or when power sources are low, in the case of the AC Utility buses specifically, they function to maintain power to essential systems without automatic disconnection under normal operations. For example, battery power can be monitored, but the AC Utility buses will not automatically shed load merely because battery capacity is reduced; instead, management and prioritization of power distribution would typically be handled manually depending on operational necessity. Thus, the most accurate answer reflects that the buses are generally designed to remain operational and do not load-shed automatically during typical phases of flight, such as landing or engine starts, making the choice that indicates they never automatically shed load the correct one.