What should you do if the load weight is unknown or uncertain?

• A. Proceed with a reduced lift and test with a small portion of the load.
• B. Use approximate estimation and proceed.
• C. Do not lift; obtain weight from load origin or use weight estimation tools or manufacturer-rated charts.
• D. Lift only the part of the load you can estimate physically.

Answer: (C)

When a load’s weight is unknown, you must not lift it until you have an accurate weight. Knowing the exact weight lets you verify the crane’s rated capacity, choose the correct rigging and hook height, and account for dynamic loads during lifting. If the weight isn’t known, obtain it from the load origin or use weight estimation tools or manufacturer-rated charts to determine the appropriate lifting capacity and rigging. Only with a verified weight can you plan a safe lift and avoid overloading the crane or slings. Guessing the weight, lifting a partially estimated portion, or proceeding without reliable data can lead to equipment failure, dropped loads, or serious injury. If weight data can’t be obtained, delay the lift and seek guidance from supervision or engineering.