Under normal operations, the primary hydraulic system powers which components?

• A. Nose wheel steering and speed brake
• B. Landing gear and flaps
• C. Nose wheel steering and landing gear
• D. Trim aid device and speed brake

Answer: (B)

The main idea here is that the primary hydraulic system is responsible for the big, load‑bearing configuration changes that you need during critical phases of flight. Landing gear and flaps are the components that require substantial hydraulic force to extend, retract, and adjust quickly and reliably as you take off and land. Because these surfaces are essential for safe ground handling and lift management, they are powered by the primary hydraulic system.

Other items like nose wheel steering and speed brakes are typically driven by different hydraulic circuits or control arrangements, not the primary system in normal operations. The trim aid device, depending on the aircraft, may be connected to other subsystems rather than the primary hydraulics. This separation helps ensure essential gear and flap operations remain dependable while other systems have their own power sources.