When towing certain aircraft, what is a typical requirement for those with a steerable nosewheel?

When towing certain aircraft equipped with a steerable nosewheel, it is essential to set the torque-link lock to full swivel. This requirement is crucial because a steerable nosewheel can cause instability during towing if it is not properly managed. When the torque-link is set to full swivel, it allows the nosewheel to pivot freely, accommodating changes in direction and ensuring that the aircraft remains stable throughout the towing process.

Having the torque-link lock set helps prevent potential damage to the nosewheel mechanism and allows for smoother, safer handling during turns. This setting also helps the towing vehicle maintain better control over the aircraft's trajectory, reducing the risk of accidents or mishaps.

While the other options may contribute to safe towing operations, they do not specifically address the critical requirement for handling a steerable nosewheel properly. Therefore, understanding the importance of the torque-link lock is key for safe aircraft towing procedures.