What operational procedure should be followed when conducting mainline operations?

In mainline operations, conducting a system safety check is essential as it ensures that all components of the rigging system, including anchors, ropes, hardware, and the overall setup, are functioning correctly and safely before any operations commence. This step is pivotal in identifying potential hazards or weaknesses in the system that could lead to accidents or failures during the rescue operation.

By performing a thorough safety check, the team can verify that all equipment is in good condition, that the load limits are respected, and that the entire system has been properly configured for the intended rescue scenario. This proactive approach promotes safety and enhances the effectiveness of the rescue operation.

The other options do not encompass the necessary comprehensive safety protocols required for mainline operations. Inspections on static equipment only would overlook the dynamic elements in use, limiting communication to visual signals could hinder effective coordination, and using only one rope would not offer the redundancy and safety typically required in rescue operations. Thus, the importance of a system safety check stands out as a critical operational procedure.