What is the primary purpose of a Load Chart in crane operation?

• A. To plan general project timelines.
• B. To inspect the crane for wear.
• C. To determine the safe lifting capacity at specific radii and boom configurations.
• D. To plan general crew rotations.

Answer: (C)

At its heart, the Load Chart is the crane’s safety reference for how much weight can be lifted at a given radius and boom setup. It shows the maximum allowable load for each combination of boom length, radius (the distance from the crane’s center to the load), and configurations like counterweights or whether a jib is attached. As the boom extends longer or the load is held farther out, leverage increases and stability margins shrink, so the permissible load drops. The chart translates all those factors into a number that you can use to plan lifts: if the load weight is within the chart’s rating for the current configuration, the lift can be performed safely (assuming proper setup and conditions). If not, you must adjust—reduce the load, move closer (decrease radius), change the configuration, or choose a different plan. This is why the Load Chart is used both in planning lifts and during execution. Other options—planning timelines, crane inspections, or crew rotations—are separate tasks and not related to determining safe lifting capacity.