What is necessary regarding the distribution of electrical power in a Part 23 airplane?

The requirement that pertains to the distribution of electrical power in a Part 23 airplane is that it must have sufficient capacity to supply essential loads if the primary electrical source fails. This is crucial for maintaining safety and operational functionality during flight. In the event of a primary electrical failure, the aircraft must be able to continue operating essential systems, such as communication and navigation equipment, to ensure safe flight and landing.

Ensuring that the electrical system can handle these essential loads not only supports regulatory compliance but also embodies the principles of redundancy and reliability that are foundational in aviation safety. It is vital for pilots and maintenance personnel to understand the importance of these backup systems, as they are critical in mitigating risks associated with electrical failures.

The other options do not align with the fundamental safety principles and regulatory requirements for aircraft operations. For example, stating that the system must operate without backup systems contradicts the safety philosophy designed to protect against failures. Limiting functionality to ground operations ignores the need for reliable systems during all phases of flight. Similarly, suggesting that there should be complete power throughout flight without limitations overlooks the reality that electrical systems must prioritize essential loads in case of emergencies.