Which subsystem carries the load to the electrical loads?

• A. The primary power distribution
• B. The emergency power distribution
• C. The secondary power (load) distribution
• D. The power source distribution

Answer: (C)

Power in an aircraft electrical system moves from the sources into the distribution networks, and the part that actually delivers that power to all the devices and circuits is the secondary power distribution. This secondary (load) distribution sits downstream of the primary distribution and routes electricity to the various loads—avionics, lights, actuators, instruments—through the load buses and breakers. It’s the network that ensures each piece of equipment gets power in the right manner, while the primary distribution handles feeding the main buses from generators and other sources. The emergency distribution is reserved for essential loads during abnormal conditions, and “power source distribution” isn’t the term used for delivering power to the loads.