What standard hand signal indicates to raise the boom and lower the load?

The standard hand signal that indicates to raise the boom and lower the load involves the use of specific gestures. Typically, the signal consists of raising the arm with the hand open and moving it up and down. This clearly communicates to the operator that the boom should be elevated while the load is lowered simultaneously.

Understanding the hand signals is crucial for safe operations because they facilitate non-verbal communication between the rigger and the crane operator, especially in environments where verbal instruction may be challenging due to background noise or distance. Having a clear and universally understood system of signals reduces the risk of accidents and ensures that all personnel are on the same page regarding the movements of the crane.

The other options do not align with the standard definitions of hand signals in crane operations, as they represent different actions or commands that do not pertain to both raising the boom and lowering the load.