Which components are part of the Hydraulic Valve Package?

The Hydraulic Valve Package is central to the operation of several critical systems within an aircraft, particularly those that rely on hydraulic mechanisms for actuation. The correct option identifies the components that are directly powered by hydraulic systems.

Flaps, landing gear, and speed brakes all rely on hydraulics for their operation. The flaps adjust the lift characteristics during takeoff and landing, while the landing gear is deployed and retracted through hydraulic actuation. Speed brakes are used to increase drag and reduce airspeed efficiently and also utilize hydraulic power for their extension and retraction.

The other choices do not consist solely of components typically associated with hydraulic systems. For instance, while wing spoilers and ailerons play crucial roles in flight control, they often use different actuation forms or may not all be hydraulically powered in every aircraft design. Similarly, the main gear and tail wheel primarily involve mechanical systems rather than solely hydraulic ones, making them less relevant to the specific components of the Hydraulic Valve Package.

Thus, the selection of flaps, landing gear, and speed brakes accurately reflects the primary components facilitated by hydraulic systems within most aircraft.