Final answer:
A GEN 1/2 OVLD message shown by the Generator Control Unit on EICAS indicates an overload condition where engine-driven generator 1 or 2's electrical load exceeds safe limits.
Step-by-step explanation:
The Generator Control Unit (GCU) will display a GEN 1/2 OVLD message on the Engine Indicating and Crew Alerting System (EICAS) when engine-driven generator 1 or 2 exceeds its rated load capacity. This overload message is an alert that the electrical load on the generator has surpassed safe operating limits, which may happen due to excessive electrical demand or a malfunction within the electrical system. The GCU is designed to monitor generator performance and protect it from damage by automatically reducing the generator's load or even taking it offline if necessary.
Modern aircraft rely heavily on their electrical systems for everything from flight controls to passenger comfort, making the management of these systems critical. Should a GEN 1/2 OVLD message appear, pilots must follow standard procedures to address the issue, which might include shedding non-essential electrical loads or following checklist items to troubleshoot the condition.