Which diagram on a crane load chart shows the crane's range of operation without accounting for boom deflection?

• A. Range diagram
• B. Load chart
• C. Elevation diagram
• D. Boom diagram

Answer: (A)

The main idea is the operator’s working envelope. The range diagram maps the area the crane can reach and sweep from its current setup, shown as the reachable boundary, and it does this assuming a rigid boom. It deliberately does not include boom deflection, which is the bend or bow the boom experiences under load and changes the actual reach. So this diagram is used for planning where the crane can move, without accounting for how deflection would shrink that reach under real lifting conditions. The other diagrams serve different purposes: the load chart shows how much weight can be lifted at various radii and boom lengths, the elevation diagram indicates vertical reach versus angle, and the boom diagram shows boom configurations.