Final answer:
In an aircraft, when a DCU generates an EICAS message, the data appears on the flight deck's EICAS display screens for the crew to take appropriate action.
Step-by-step explanation:
When a Data Concentration Unit (DCU) generates an Engine Indicating and Crew Alerting System (EICAS) message, the data is sent to the aircraft's flight deck displays, specifically to the EICAS display screens. The EICAS system monitors aircraft engine parameters and other critical flight data and ensures that this information is presented to the pilots in a clear and organized manner. In the event of a system fault or warning, EICAS will display the appropriate message so that the flight crew can take the necessary actions.