🔍 Key Concepts

• How a crane load chart is actually used on board (what variables you look up on the chart) • The meaning of load radius on a crane and how it changes as you luff (raise/lower) the boom • Which items (like strength of parts) are already built into the chart and which are NOT axes on the chart

💭 Think About

• When an operator checks a crane’s load chart, what two changing factors do they usually line up to find the safe working load? • As the boom is extended outward over the side, what distance from the crane’s center becomes critical for stability and loading? • Are things like boom strength and cable strength typically shown as separate inputs on the chart, or are they already accounted for in the allowable load values?

✅ Before You Answer

• Verify which option represents a measurable distance from the crane’s center or pivot point that changes with boom position. • Confirm that a load chart usually has boom length plus one other geometric factor, not internal material strengths. • Eliminate any choices that describe built‑in design limits of the crane rather than variables the operator enters into the chart.