What is the primary purpose of the PMU?

The primary purpose of the Power Management Unit (PMU) is to maintain the engine and propeller within their operating limits. This involves monitoring and controlling various parameters, such as fuel flow, engine speed, and propeller pitch, to ensure optimal performance and safety. By regulating these factors, the PMU helps prevent conditions that could lead to engine failure or propeller damage, thereby ensuring the aircraft operates efficiently and safely during flight operations.

While enhancing fuel efficiency is certainly a beneficial outcome of proper management and control, it is not the central function of the PMU. Similarly, while managing electrical systems and controlling cabin temperature are important for overall aircraft operations, those tasks are typically handled by other systems, such as electrical management systems and environmental control systems, respectively. Hence, the core role of the PMU is specifically focused on the engine and propeller's operational integrity.