Which component is powered by hydraulic System B?

• A. Trailing edge flaps
• B. The power transfer unit (PTU)
• C. Ground spoilers
• D. Alternate brakes

Answer: (A)

To determine which component is powered by hydraulic System B, it's essential to understand the roles of each component listed in the choices and where hydraulic power is typically applied in an aircraft's hydraulic systems.

Trailing edge flaps are aerodynamic surfaces that are commonly operated by hydraulic systems to change the shape of the wing for better lift during takeoff and landing. These flaps require considerable force and precise control, making hydraulic power a suitable choice for their operation.

On the other hand, the power transfer unit (PTU) is responsible for transferring hydraulic pressure between different systems and is typically powered by a separate hydraulic system rather than specifically by System B. It acts as a backup or support for ensuring that hydraulic pressure is available to essential systems, rather than being a direct consumer of hydraulic power.

Ground spoilers aid in deceleration and can also be involved in lift management during landing. While they do utilize hydraulic power, the specific hydraulic systems they operate on can vary and may not directly correlate with System B unless otherwise specified.

Alternate brakes serve as a backup braking system using hydraulic power but again may be designed to operate on different hydraulic systems based on the aircraft's configuration.

In summary, trailing edge flaps are most commonly associated with hydraulic System B's primary functions in many aircraft designs