What is the main role of the nose wheel torque link lock when towing a tricycle-gear airplane?

The primary function of the nose wheel torque link lock when towing a tricycle-gear airplane is to facilitate the full swivel of the nose wheel. By setting the nose wheel to full swivel, the aircraft can be maneuvered more easily while being towed. This is crucial for navigating tight spaces, such as ramp areas or hangars, where precise directional control is needed.

When the nose wheel is fully swiveled, it can pivot to follow the direction of the towing vehicle, allowing for smoother and safer towing operations. Ensuring that the nose wheel can fully swivel helps avoid potential issues with ground handling and creates a more stable towing experience. While other options may touch upon different aspects of aircraft behavior, the main role of the torque link lock is specifically to enable this full swivel capability, making it essential for effective towing.