What must a rigging crew ensure before climbing a tower crane to avoid jamming of the climbing sections?

A rigging crew must ensure all debris and equipment are cleared before climbing a tower crane to prevent jamming of the climbing sections. When debris or other equipment is present, it can obstruct the mechanisms or the path that the climbing sections need to move through as they adjust the height of the crane. This obstruction can lead to mechanical failure or operational hazards, thus safety and functionality of the crane are compromised. Clearing the area ensures that the climbing operation can proceed smoothly without interruptions or risks associated with jamming.

The other choices, while important for safety and efficiency on a construction site, do not specifically address the issue of jamming in the climbing sections of a tower crane. Having the necessary tools on hand is crucial for operational efficiency, personal safety gear is essential for worker protection, and reviewing signals is critical for safe communication among crew members. However, these factors do not directly prevent the mechanical jamming issues that can arise from debris or equipment improperly left on or around the crane’s climbing sections.