What role does the APU play in emergency situations?

The APU, or Auxiliary Power Unit, plays a crucial role in emergency situations, especially in providing electrical power to the aircraft when the main engines are not operational or when ground power is unavailable. This capability allows critical systems to function, including lighting, electronics, and avionics, which are essential for pilot operations and safety during emergencies.

Understanding the significance of the APU's electrical supply function is vital, as it underscores the importance of having a reliable power source when the main engine generators may be offline. This ensures that the crew can maintain control of the aircraft and manage necessary systems until normal power can be restored.

The outstanding feature of the APU in emergency scenarios is its ability to keep critical systems operational, which is not merely supplementary; it can be the difference between successfully managing a situation or facing greater challenges.