What does "On System" mean?

"On System" typically refers to confirming that the main line is ready for use in a rescue operation. This phrase generally indicates that all necessary pre-operations checks have been completed, equipment is in place, and the system is configured correctly for the intended rescue maneuver.

In a rescue scenario, ensuring that the main line is ready is crucial for the safety and effectiveness of the operation. It serves as a status check to make sure that everything is functional before any movement or action is taken. If the main line is not ready, it poses a risk of failure during the critical moments of the operation, which could have serious consequences.

The other options describe actions that may occur after confirming the system is indeed "on," such as beginning to move a load or stopping all movement if issues arise, but they do not accurately capture the definition of "On System." The phrase specifically highlights the readiness and safety of the primary operational line being utilized.