Who services the Auxiliary Power Unit (APU) in the aircraft?

The Auxiliary Power Unit (APU) is a critical component of the aircraft that provides electrical power and pneumatic pressure for starting the main engines, along with power for various systems while the aircraft is on the ground. Servicing the APU requires specialized knowledge and skills, particularly in understanding its specific operational requirements and maintenance protocols.

Mechanics are trained to handle the APU service tasks, which often involve performing routine checks, troubleshooting issues, and conducting necessary repairs. Their expertise ensures that the APU operates reliably and efficiently, which is essential for the overall functionality of the aircraft during ground operations.

While the Plane Captain plays a crucial role in the overall management and supervision of aircraft readiness and safety, including overseeing maintenance activities, they typically do not perform the technical servicing of complex systems like the APU. The electronic technician focuses primarily on electronic systems and is not tasked with servicing the APU either. The crew chief, while responsible for leading maintenance teams and ensuring aircraft readiness, may not directly service the APU as they may not possess the specific qualifications needed for that task.

Thus, it is the mechanics who perform the servicing of the APU, ensuring its proper function and contributing to the operational integrity of the aircraft.