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

What is the function of the Lamp Driver Unit (LDU)?

1. Controls the aircraft lighting system

2. Interprets signals and illuminates switch lights

3. Manages the audio alerts

4. Regulates power supply to displays

The correct answer is: Interprets signals and illuminates switch lights

The Lamp Driver Unit (LDU) serves as a crucial component in the aircraft systems by interpreting signals from various onboard systems and subsequently illuminating the appropriate switch lights on the cockpit panel. This function ensures that pilots receive visual cues regarding the status of critical systems, which enhances situational awareness during flight operations. By illuminating switch lights based on specific operational parameters or alerts, the LDU plays a significant role in the overall functionality and safety of the cockpit environment. When exploring other functions, controlling the entire aircraft lighting system involves multiple components and systems, not solely the LDU. While managing audio alerts and regulating power for displays are important tasks within aircraft systems, they fall outside the primary function of the LDU and relate to different units and controls designed for those specific tasks.