Which component monitors the starter speed during the engine start process?

The Generator Control Unit (GCU) is responsible for monitoring various electrical parameters during the engine start process, including starter speed. It ensures that the starter motor is operating within its specified speed range, which is critical for a successful engine start. By doing so, the GCU plays a vital role in preventing potential issues such as an under-speed condition that could prevent engine ignition or an over-speed scenario that could damage the starter or engine components.

In addition to monitoring starter speed, the GCU manages the overall electrical system during the start-up phase, coordinating with other components to ensure that voltage and current levels are maintained within safe operating limits. This centralized monitoring helps maintain the integrity and reliability of the starting system.

The other options, while important components of an aircraft's electrical system, do not have the primary function of monitoring the starter speed specifically during the engine start process. The Battery Charge Bus primarily deals with battery management, the Galley Bus distributes power for cabin services, and the DC Load Monitor provides information about the state of the DC electrical system but does not monitor starter speed directly.