There is a load that needs to be moved by sling load that requires the sling load rigger to add attachment points. The load is 19,000 lbs. How many large clevises must be used as attachment points to safely lift the load?

• A. 2
• B. 4
• C. 3
• D. 5

Answer: (C)

The important idea is to match the attachment points’ total rated capacity to the load, with a margin for safety and dynamic lift. Each large clevis has a working load limit (WLL). If you assume a typical WLL of about 7,500 lb per large clevis, you need enough clevises so their combined capacity meets or exceeds the 19,000 lb load. Two clevises would give 15,000 lb, which is not enough. Three clevises provide 22,500 lb, exceeding the load and giving a safety margin for lift dynamics. So three attachment points are the minimum required.