If a repair other than component replacement is required for a sling, to what percent of rated load must it be tested?

• A. 100 percent of rated load
• B. 200 percent of rated load
• C. 150 percent of rated load
• D. 50 percent of rated load

Answer: (B)

Testing a sling after a repair (not a full component replacement) must be done by proof testing to 200% of its rated load. This high load margin helps ensure the repair restores the sling’s full strength and can withstand overloads that may occur in service, including dynamic or shock loading. The rated load, or working load limit, is the maximum load the sling is intended to carry under normal conditions; proving it to double that amount verifies the repair hasn’t introduced hidden weaknesses and that the sling remains safe to use. Testing to only the rated load wouldn’t reveal potential defects under higher-than-normal stresses, and a much lower value (like 50% or 150%) wouldn’t provide the necessary safety margin.