30d (edited) • Planning & Pre-Lift Failures
Case Study 99: Wrong Crane Choice. Plan Changed, Capacity Margin Disappeared
Incident Overview
A mobile crane overturned during an operation where planning and lift selection were not adequately controlled. The incident illustrates a common pattern: crane size/type selected for “expected” conditions, then conditions or configuration shift and capacity margin disappears.
What Went Wrong
Crane selection did not match real operating radius/ground conditions
The lift became “unplanned” in execution
Risk was assessed in isolation, not as a full system
Key Lessons Learned
Crane selection is part of lift planning, not procurement
If the plan changes, the crane choice must be revalidated
Margin is your safety buffer—don’t spend it
Safety Recommendations
Confirm crane selection using verified weight, radius, configuration, and ground strategy. Re-plan if site constraints change.
Incident source
UK mobile crane overturn prosecution linked to poor planning/unplanned lift.
●LOLER Reg. 8 – Lifts must be properly planned.
●LOLER Reg. 9 – Planning must be by a competent person.
●PUWER Reg. 4 – Equipment must be suitable for the task.
●BS 7121-1 – Crane selection must match load and site.
Key point
Margin is part of safety.
Wolf Lifting Dynamics – Safe Lifting UK | Case Study 99
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Case Study 99: Wrong Crane Choice. Plan Changed, Capacity Margin Disappeared
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