Which flight controls are included in the auxiliary group?

The auxiliary group of flight controls typically includes devices that enhance the aircraft's performance and handling but are not primarily used for basic flight control. Wing flaps, speed brakes, and spoilers are considered auxiliary flight controls because they modify the aircraft's lift and drag characteristics and help manage speed and descent rate during flight.

Wing flaps increase lift during takeoff and landing, allowing for lower speeds and shorter runway requirements. Speed brakes are used to increase drag and reduce airspeed, particularly during descent or landing approaches. Spoilers can also reduce lift and increase drag, helping to control the descent and providing better braking effectiveness.

This distinguishes them from primary flight controls such as elevators, ailerons, and rudders, which are crucial for basic maneuverability and stability. The other options focus on additional surfaces or modifications that do not directly fall under the category of auxiliary controls.