FAA AMT Airframe Practice Exam 2026 – Complete Exam Prep Guide

The rudder is primarily used for directional control about the vertical axis of an airplane. The other options, ailerons, elevators, and flaps, all control the airplane's movement about a different axis. Ailerons control the roll of the airplane, elevators control the pitch, and flaps control the lift and drag. None of these controls are primarily used for controlling yaw, which is the rotation about the vertical axis. Therefore, they are not the correct answer.