What is the significance of an APU's control module?

The control module of an Auxiliary Power Unit (APU) plays a crucial role in managing the operational sequences and ensuring safety protocols are followed during its operation. Functioning as the brain of the APU, the control module oversees various processes, including startup procedures, operational status monitoring, and shutdown sequences. It is responsible for controlling fuel flow, ignition timing, and other vital parameters that ensure the APU operates efficiently and safely.

Moreover, the control module monitors system data to detect anomalies or malfunctions, which enhances safety by initiating appropriate responses, such as shutting down the APU if unsafe conditions are detected. This ensures that both the APU and the overall aircraft systems remain protected during operation. Thus, its significance cannot be overstated, as it directly affects both performance and safety aspects of the APU.