What action is required if a crane exceeds 75% of its net capacity when creating a lift plan?

When a crane exceeds 75% of its net capacity during the planning of a lift, it is essential to conduct extra engineering evaluations. This action is crucial because operating at such a high percentage of capacity raises significant safety concerns. At this level, the risk of tip-over or mechanical failure during the lift increases, making it imperative to ensure that all factors—such as load dynamics, conditions of the lift site, and crane stability—are thoroughly analyzed.

Additional engineering evaluations can involve calculations related to the crane's load chart, considerations for any rigging equipment used, the potential for dynamic load changes during the lift, and the specifics of the lift environment, such as ground conditions and any obstacles that may impact the lift. By requiring these evaluations, safety is prioritized, and the risks associated with lifting heavy loads close to the crane's capacity can be effectively managed.

Other actions, like reducing the load or consulting with the manufacturer, may seem reasonable but do not provide the comprehensive assessment needed for safe operations at this threshold. Thus, the requirement for additional engineering evaluations addresses the critical need for safety in lifting operations when near the crane's capacity limits.