What should a GMT crane operator do if they lose sight of the signal person?

When a GMT crane operator loses sight of the signal person, the appropriate action is to stop the crane's motion. This is essential for maintaining safety on the job site. The signal person is responsible for guiding the crane operator and providing necessary instructions for safe operation. If the operator cannot see the signal person, it creates a situation where they may not have the proper guidance to continue operating safely. By stopping the crane, the operator prevents any potential accidents or mishaps that could occur from operating without clear communication and visibility of the signals being given.

Continuing operation without visual contact could lead to unintended movements that pose hazards to workers in the vicinity, nearby structures, or the load being handled. Thus, halting operations is a precautionary measure to ensure the safety of everyone present until communication is reestablished or visibility is restored.