What should the signalperson monitor when giving the "extend telescoping boom" signal?

When giving the "extend telescoping boom" signal, the signalperson should specifically monitor for two-blocking of the crane. Two-blocking occurs when the hook or block travels too far and comes into contact with the boom, which can severely damage the equipment and create a hazardous situation.

By keeping an eye on the potential for two-blocking, the signalperson can ensure that the operator is extending the boom safely and within the operational limits of the crane. This is crucial for maintaining both the integrity of the equipment and the safety of personnel in the area.

Monitoring other factors, such as communication between the operator and the load, weather conditions, and ground stability, while important in general crane operation, are not specifically the focus of the signalperson's responsibilities when extending the boom. Their primary role during this action is to ensure safe operation by preventing any risk of two-blocking, which is a direct concern during the process of extending the boom.