Which ULY factor is described as the relationship between collective input and yaw of the aircraft?

• A. WEATHERCOOK STABILITY
• B. MAIN ROTOR / TAIL ROTOR INTERACTION
• C. LOSS OF TRANSLATIONAL LIFT
• D. COLLECTIVE INDUCED YAW

Answer: (D)

The main idea being tested is how changing the collective pitch affects the aircraft’s yaw through rotor torque reactions. When you increase collective, you increase the main rotor torque. The tail rotor must produce more anti-torque to balance that added torque, which creates a yaw tendency. The direction and magnitude of that yaw are tied to how much collective input you apply, hence it’s described as collective induced yaw. The other options describe different phenomena: weathercock stability is about nose tendency into the wind, rotor interactions cover aerodynamic/vibration effects between rotors, and loss of translational lift refers to the hover-to-forward-flight transition.