What does "EPU" stand for in aviation terminology?

The term "EPU" in aviation terminology refers to "Emergency Power Unit." This unit is critical for providing backup power during emergency situations, particularly when the primary power sources fail or are insufficient. In the context of aircraft like the T-6A Texan II, the EPU is essential for maintaining vital functions of the aircraft, such as operating essential systems, avionics, and emergency equipment. Understanding this term is important for pilots and crew members, as the EPU plays a significant role in emergency procedures and safety protocols. The other terms do not accurately represent what EPU stands for in aviation, as they either refer to different concepts or are not used in this particular context.