F/A-18 E/F Plane Captain Practice Exam

The correct answer indicates that the Auxiliary Power Unit (APU) of the F/A-18 E/F supports both electrical and hydraulic systems while on the ground. The APU is crucial for providing power when the main engines are not running, which is particularly important for pre-flight checks, maintenance, and ground operations.

When the aircraft is on the ground, the APU can supply electrical power to various systems, allowing for the operation of onboard avionics and maintenance equipment without relying on external power sources. Additionally, it provides hydraulic power necessary for operating ground handling equipment such as landing gear, flaps, and brakes. This dual capability ensures that the aircraft can be prepared for flight and undergo necessary checks efficiently without the need for engine operation.

The other options do not fully capture the APU's functions. For instance, while the APU does not directly support weapon systems during flight, it is an essential part of ground operations. Understanding the APU’s role in providing power to both electrical and hydraulic systems helps in appreciating how the F/A-18 E/F is serviced and prepared for missions.