What is the correct response if an aircraft tug operator loses sight of the wing walker during a towing operation?

The correct response if an aircraft tug operator loses sight of the wing walker during a towing operation is to immediately stop the towing operation. The tug operator should bring the aircraft to a controlled stop as quickly and safely as possible. Maintaining visual contact with the wing walkers is essential for safe towing operations, as they are responsible for monitoring the aircraft's wingtips and ensuring adequate clearance from obstacles. If the wing walker is no longer visible, the tug operator cannot be certain that the aircraft is clear of obstructions. Continuing to tow the aircraft without visual confirmation from the wing walker could result in a collision. Once the aircraft has stopped, the tug operator should attempt to re-establish communication with the wing walker to determine the cause of the loss of sight and to ensure that the aircraft is safe to continue towing. Towing should only resume once visual contact with the wing walker is re-established and the situation has been assessed.