How should sling lengths and attachment points be chosen for a rectangular load to ensure balance?

• A. Use random length slings attached to any point on the edges.
• B. Attach all slings to a single corner to maximize tilt resistance.
• C. Attach the longest slings possible regardless of load CG.
• D. Use equal-length slings attached at opposite corners, near the load's CG; ensure symmetrical angles and avoid lifting from imbalanced points.

Answer: (D)

Balancing a rectangular load during a lift comes from making the lifting forces act evenly through the load’s center of gravity and keeping those forces aligned so the load stays level. When you use slings of equal length attached to opposite corners near the load’s CG, each sling shares the weight equally and the resultant lifting force passes very close to the CG. Making the angles symmetrical helps the two lifting forces point in similar directions, so there’s minimal turning moment that could tilt or spin the load.

If you choose random lengths or attach to arbitrary points on the edges, you can create uneven vertical components, causing the load to tilt or roll as you lift. Putting all slings on a single corner concentrates the moment at that corner and makes the load pivot away from level. Using the longest slings without regard to the CG ignores geometry and can introduce unwanted horizontal forces and instability.