Where do the left and right DCMPs obtain their power?

The left and right DCMPs (Direct Current Motor Pumps) obtain their power from specific electrical systems within an aircraft. In this case, the correct choice indicates that the right DCMP receives its power from the left ESS (Essential Power) bus, while the left DCMP draws power from the right main bus.

This configuration allows for redundancy and safety in the aircraft's power distribution system. By having the DCMPs draw power from different sources, it ensures that if one power system experiences a failure, the other can provide support, maintaining the functionality of the pumps and the overall system. The utilization of different buses to supply power also helps to evenly distribute the electrical load across the aircraft’s systems.

In this scenario, the left and right ESS and main buses play distinct roles, with each one being capable of supporting critical systems in the event of a fault in another. Understanding this distribution is key to comprehending the reliability and design of aircraft power systems.