What does the boom out signal indicate?

The boom out signal indicates that the operator should extend the arms outward, with thumbs pointing out as a clear communication to others on the site. This signal is essential for safety and coordination during lifting operations, ensuring that those around the area understand what the operator is doing.

When arms are out, it typically means that a load is being positioned or that the operator intends to move the boom or load in a specific direction. This visual cue helps prevent accidents by providing a clear indication of the operator's intentions to those nearby. In crane operations, such clear signaling reduces the risk of misunderstandings that could lead to dangerous situations.

The other options do not represent the established signals for crane operations: directing the load to the left or lowering the load would require different signals, and both arms down typically indicates a stop or a neutral position rather than specifically extending the boom.