Which flap type extends from the fuselage to the aileron on each wing and is actuated electronically?

• A. Plain flap
• B. Split flap
• C. Slotted flap
• D. Fowler flap

Answer: (A)

The main idea here is how the flap sits on the wing and how it is moved. A flap that runs as a single hinged panel along the trailing edge from the fuselage out to the aileron on each wing describes a plain flap in many aircraft. It’s the simplest arrangement: one piece, hinged on the back edge, that can be lowered to increase camber and lift, and in modern designs can be driven by electric actuators. This matches the description of extending across the wing from root toward the outer edge where the aileron starts, while remaining a straightforward, electronically actuated surface.

The other flap types involve additional mechanisms or movements that don’t fit as neatly with that description. Split flaps involve only the lower surface moving and mainly add drag; slotted flaps have a gap between the flap and wing to energize airflow; Fowler flaps slide backward and downward to increase wing area. Their typical configurations and motions don’t align as cleanly with the stated span and electronic actuation, making the plain flap the best fit for this scenario.