What system automatically starts the APU and includes safety features for shutdown?

• A. APU Control Unit
• B. APU Power Management System
• C. APU Safety Control System
• D. APU Monitoring System

Answer: (C)

The system that automatically starts the Auxiliary Power Unit (APU) and incorporates safety features for shutdown is the APU Safety Control System. This system plays a crucial role in ensuring the safe and effective operation of the APU by not only initiating its startup sequence but also monitoring various parameters such as temperature, pressure, and operational status. If any of these parameters exceed predefined safety limits, the system can autonomously command the APU to shut down, thus preventing potential damage or hazardous situations.

In contrast, while other systems mentioned may be involved in managing or monitoring the APU's functions, they do not encompass the specific safety shutdown features that the APU Safety Control System does. For instance, the APU Control Unit might handle the operational controls but lacks the dedicated safety shutdown protocols, and the APU Monitoring System typically focuses on real-time data reporting rather than initiating shutdowns based on safety conditions.