What do integrity levels indicate in regards to the electrical system?

Integrity levels in the context of an electrical system refer to how well the system will maintain reliability and continue functioning correctly during failures or unexpected events. This concept is critical because it directly relates to safety and operational continuity, especially in aviation where the reliability of power distribution is paramount to ensure that essential systems remain operational even when individual components fail.

When integrity levels are assessed, they provide insights into the design, redundancy, and fault tolerance of the electrical system. A higher integrity level indicates that the system is more capable of withstanding faults without a complete failure, ensuring that critical systems receive the necessary power during emergencies.

The other options, while relevant to the electrical systems, do not capture the core meaning of integrity levels as it relates to reliability during failures. For instance, power usage efficiency and maximum power output capacity address different aspects of system performance and capability, while the maintenance schedule pertains to upkeep rather than operational reliability during faults.