How may the employee switch from radio to hand signals during a movement?

The correct choice highlights that switching from radio to hand signals during a movement requires stopping the movement first and notifying crew members. This practice ensures safety and clarity among all personnel involved. When the movement is stopped, it provides an opportunity to properly communicate the change in signaling methods without the risk of miscommunication or accidents that could occur if signals are given while the equipment is still in motion.

Stopping the movement also gives time for all crew members, including the operator and any ground personnel, to acknowledge the switch in communication methods before proceeding. This is crucial in maintaining safety protocols, as each method of communication may have different interpretations or implications in the field.

Using a specific command may not necessarily ensure that all crew members are aware of the change, just as understanding the instructions without a clear halt to the operation could lead to confusion and potential hazards. Additionally, waiting until the movement is complete to switch signals does not allow for the necessary real-time communication that might be required during operations. Thus, stopping the movement and ensuring all crew members are informed is the safest and most effective approach.