RIGGING & LIFTING MISTAKES THAT CAUSE DROPPED LOADS
Rigging is where a lift is made or lost. Get the gear, the angles and the plan right and the load moves predictably. Get any of them wrong and you can drop a load, swing it into people or overload a component that fails without warning.
Most rigging incidents are not freak events. They trace back to a handful of avoidable mistakes: guessing weights, using worn gear, ignoring sling angles and skipping the lift plan. Each one on its own can be enough to hurt someone.
These are the rigging and lifting mistakes we see cause the most damage, why they matter and how a competent professional keeps the load in the air and the crew safe.
1.Guessing the load weight
Crews often eyeball a load rather than confirming its actual mass. Underestimate it and you overload the crane and the rigging gear at the same time. That is a direct path to a dropped load, a failed component or a crane tipping, and it is one of the first things an investigator checks after an incident.
How a professional handles it: A competent rigger establishes the true weight from documentation, weighing or load cells and confirms it against the crane's load chart before the lift.
2.Ignoring sling angle effects
As the angle between slings and the load gets flatter, the tension in each leg climbs sharply. Riggers who ignore this can double or triple the actual load on a sling without realising it. The gear then fails at a fraction of the weight everyone assumed was safe.
How a professional handles it: A professional calculates leg tensions for the actual sling angles and selects gear with capacity to match, keeping angles within safe limits as set out in AS 2550.
3.Using damaged or uninspected lifting gear
Slings, shackles, chains and hooks wear, stretch and crack in service. Grabbing gear off the rack without checking it means a hidden defect goes straight under load. A single failed sling leg can drop the whole load in an instant.
How a professional handles it: A competent person inspects every item before use, withdraws anything worn or damaged and works only with gear that has current inspection and rating records.
4.Overloading gear by ignoring the working load limit
Rigging gear is rated for a working load limit, but crews sometimes read only the size or assume 'it will hold'. Loading past the rated limit removes the safety margin the gear is designed around. When it lets go, it usually does so suddenly and without warning.
How a professional handles it: A professional matches every component's working load limit to the calculated load, including the effect of angles, so nothing is ever loaded beyond its rating.
5.Bad load control and no tag lines
A load that can swing, spin or snag is a load that can strike people or structures. Crews often lift without tag lines or a plan to control movement. A load that gets away from the crew can crush a limb or knock someone off a platform in seconds.
How a professional handles it: A competent rigger plans load control in advance, uses tag lines where needed and keeps people clear of the load path throughout the lift.
6.Poor rigging points and unbalanced loads
Attaching to convenient points rather than proper lifting points can tip a load, damage it or shed part of it mid-lift. An off-centre pick makes the load swing the moment it leaves the ground. That sudden shift is enough to overload a sling or knock a worker over.
How a professional handles it: A professional identifies the correct lifting points and centre of gravity so the load lifts level and stable, and rigs to keep it balanced.
7.No lift plan for complex or critical lifts
Heavy, awkward or multi-crane lifts get done on the fly far too often. Without a plan, nobody has confirmed capacities, clearances, ground conditions or roles. When something unexpected happens mid-lift, there is no agreed response and the situation escalates fast.
How a professional handles it: A competent person prepares a documented lift plan covering weights, gear, positions, ground bearing and responsibilities before the lift begins.
8.Sharp edges and no packing on slings
Running a sling over a sharp edge cuts into it under load. Crews often skip edge protection to save time. The sling can be severed mid-lift even though it was well within its rated capacity, dropping the load with no warning.
How a professional handles it: A professional protects slings from edges with proper packing or sleeves and routes the rigging so nothing bears on a cutting edge.
9.Unclear communication and no dogman
Lifts fail when the crane operator and the crew are not on the same page. Vague hand signals, radio confusion or nobody clearly directing the load lead to sudden movements and near misses. In a blind lift, the operator is trusting signals that may be wrong.
How a professional handles it: A competent dogman directs the lift with clear, agreed signals and full sight of the load, so the operator always has reliable guidance.
10.Working under a suspended load
People routinely walk or reach under a load to guide or fix it. If the rigging or crane fails at that moment, there is nowhere to go. This is one of the most common factors in serious crushing injuries during lifting work.
How a professional handles it: A professional enforces exclusion zones and load path control so no one is ever positioned beneath a suspended load.
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FREQUENTLY ASKED QUESTIONS
How do sling angles affect lifting capacity?
As slings move from vertical towards horizontal, the tension in each leg increases well beyond a simple share of the load. At flatter angles a sling can carry several times the weight you would expect. This is why leg tensions must be calculated for the actual angle, not assumed, and why very flat angles are avoided.
How often should lifting gear be inspected?
Lifting gear should be visually checked before every use and formally inspected at regular intervals by a competent person. Any item that is worn, distorted, cracked or over its rated life must be withdrawn from service. Keeping current inspection records is essential for compliance under the WHS Regulations.
Do I need a lift plan for every crane lift?
Routine, repetitive lifts can be covered by a standard procedure, but complex, heavy, blind or multi-crane lifts need a documented lift plan. The plan confirms weights, gear, positions, ground conditions and who is responsible for what. A competent person can advise which lifts on your site require one.
What is the role of a dogman in a lift?
A dogman directs the crane operator and controls the movement of the load, especially where the operator cannot see it clearly. They confirm the rigging, the load path and the signals used. Having a competent, clearly identified dogman is one of the simplest ways to prevent a dropped or swinging load.