Comprehensive overview of the Ram Air Turbine (RAT), an essential emergency power system in aircraft.

It explains the RAT's foundational principles, detailing how it harnesses airstream kinetic energy to generate hydraulic and/or electrical power when primary and auxiliary sources fail.

The text contrasts the RAT's last-resort emergency role with the Auxiliary Power Unit's (APU) operational flexibility, highlighting their distinct functions and dependencies. Furthermore, it examines the RAT's historical evolution, its implementation in various aircraft types, and critical real-world incidents like the "Gimli Glider" and "Miracle on the Hudson," which underscore its importance and limitations.

Finally, the source explores regulatory frameworks, maintenance imperatives, and future advancements such as counter-rotating designs, suggesting the RAT's potential to evolve into a more integrated energy harvesting system in future aircraft.