PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

True or False: The Lamp Driver Unit receives input from the DCU's to illuminate switch lights for EICAS messages.

1. True

2. False

3. Only during system checks

4. Only in emergency services

The correct answer is: True

The statement is true because the Lamp Driver Unit (LDU) is responsible for interpreting signals from the Data Concentration Units (DCUs) to control the illumination of switch lights associated with Engine Indication and Crew Alerting System (EICAS) messages. When a relevant message is generated by the aircraft's systems, the DCUs send the appropriate signals to the Lamp Driver Unit. In response, the LDU activates the corresponding switch lights, effectively providing visual alerts to the flight crew about the status of various systems. This process is crucial for enhancing situational awareness and ensuring that any system anomalies are promptly communicated to the pilots through illuminated indicators, allowing for timely response and decision-making. Understanding this interaction between the DCUs and LDU is essential for grasping how aircraft alerting systems function and how pilots remain informed about aircraft conditions.