Which shop is primarily focused on auxiliary power units?

The shop that is primarily focused on auxiliary power units is the one specifically designated as AUXILIARY POWER UNITS/SUPPORT EQUIPMENT GAS TURBINE ENGINES. This shop specializes in the maintenance, repair, and overall management of auxiliary power units (APUs), which provide energy for functions like starting the main engines and supplying electrical power and pneumatic pressure for various systems on the aircraft when the main engines are not running.

The designation of this shop underscores its concentration on APUs as well as other supporting equipment related to gas turbine engines, which are crucial for the proper operational readiness of aircraft. This focus ensures that the complexities of APUs, which can contain both mechanical and electrical components, are handled by personnel trained specifically in that area, which is essential for the safety and efficiency of aircraft operations.

In contrast, the other shops mentioned focus on different aspects of aviation maintenance, such as power plants overall, jet engine components, or propeller systems, which do not directly address the specific technologies and functions associated with auxiliary power units.