NCCCO Mobile Crane Practice Exam 2026 - Free Crane Operator Certification Practice Questions and Study Guide

When a load is lifted by a crane, the boom may experience deflection due to the weight of the load and the forces exerted on it. Boom deflection is the bending or displacement of the boom caused by the load. If the operator does not account for this deflection, the load may swing away or toward the crane as the boom settles under its weight once the load is lifted.

If the operator does not consider the dynamics of boom deflection, the load can swing outward, driven by the natural tendency of the crane to want to return to a state of equilibrium after the load is lifted. This could result in the load moving beyond the intended vertical lift path, potentially leading to an unsafe condition.

Understanding that boom deflection can significantly influence the path of the load helps the operator plan and execute the lift more safely, ensuring that the load does not swing out uncontrollably. This is particularly crucial in maintaining stability and avoiding potential hazards during lifting operations.