High Risk Work Licence - Slewing Mobile Crane C2 (20t) key terms

The legal and moral obligation of a person to take reasonable steps to avoid causing harm to themselves or others while carrying out work activities.

A person conducting a business or undertaking; the primary duty holder under work health and safety law responsible for ensuring health and safety so far as reasonably practicable.

Safe Work Method Statement: a document that sets out high-risk construction work activities, the hazards involved, and the control measures to be applied, including how they will be implemented, monitored and reviewed.

The process of identifying hazards, evaluating the likelihood and consequence of harm, and determining appropriate control measures to reduce risk to an acceptable level.

A ranked approach to managing risk, from most to least effective: eliminate the hazard, substitute, isolate, engineer controls, administrative controls, then personal protective equipment.

Job Safety Analysis: a step-by-step breakdown of a task that identifies hazards at each step and the controls required before work starts.

Personal protective equipment such as hard hat, high-visibility clothing, safety boots, gloves and eye protection, worn to reduce exposure to workplace hazards.

A crane with a boom or jib that can rotate (slew) about a vertical axis, typically mounted on a wheeled or crawler chassis, used to lift and place loads.

The main telescoping or lattice structural member of a crane that extends from the crane base to support the load at radius.

An auxiliary extension attached to the boom or mast to increase reach or height, often with a lower capacity than the main boom.

The maximum load a crane is permitted to lift under specific configuration and conditions, as stated by the manufacturer in the load chart.

A manufacturer-supplied table or graph showing the maximum allowable load for a crane at various radii, boom lengths, and configurations.

The horizontal distance from the crane's slewing centre to the centre of gravity of the load, measured with the boom in the working position.

The maximum mass that a sling, shackle, or other lifting component is designed to support in a particular configuration, as marked by the manufacturer.

The angle between a sling leg and the horizontal, which affects the tension in the sling and the load it can safely carry.

A flexible lifting assembly such as chain, wire rope, or synthetic webbing used to connect the load to the crane hook.

A U-shaped metal connector with a pin or bolt, used to join slings, hooks, or other lifting hardware to a load.

The preparation and attachment of lifting gear and slings to a load, including selection of equipment and calculation of load distribution.

Determining the total mass to be lifted, including the load, lifting gear, and any attachments, and verifying it against the crane's rated capacity.

A retractable stabilising leg extended from the crane chassis to increase the crane's footprint and prevent tipping during lifting.

The pressure exerted by the crane's outriggers or tracks on the ground, which must be checked against the ground's load-bearing capacity.

A timber or steel pad placed under outriggers to spread the load and reduce ground bearing pressure, improving stability on soft or uneven ground.

A documented check of the crane and lifting gear before use, covering structural condition, fluids, tyres, safety devices, and function of controls.

A built-in mechanism such as a load moment indicator, limit switch, or anti-two-block device that prevents unsafe operation or warns the operator.

An instrument that measures load and radius to calculate the load moment and warns or stops the crane before it exceeds rated capacity.

A record of inspections, servicing, repairs, and defects for a crane or lifting item, used to track its condition and compliance.

A dangerous condition where the hook block is pulled up against the boom tip, potentially causing wire rope damage or failure.

A safety mechanism that detects when the hook block approaches the boom tip and stops hoisting to prevent two-blocking.

The rotation of the crane's upper structure about its vertical axis, used to position the load without moving the crane chassis.

A braking system that controls or locks the slewing motion of the crane to hold the load in position or prevent unintended rotation.

The angle formed between the sling legs and the load, which determines the tension in each leg and the load's stability during lifting.

A rope attached to a load to control its movement and prevent rotation or swinging during lifting and placement.

A trained worker who directs the crane operator using hand signals or radio, and assists with slinging and load control.

A person who selects, inspects, and attaches lifting gear to loads, and calculates sling tensions and load distribution.

Standardised arm and hand movements used to communicate crane movements when radio communication is unavailable or unclear.

Two-way radio use between the crane operator and dogger or rigger to coordinate lifts, especially when the load is out of sight.

A marked area around the crane and load path where unauthorised people are not permitted, to prevent injury from falling loads or crane movement.

A clearly marked control that immediately halts crane movement in an emergency, and must be tested and accessible at all times.

A documented set of actions to follow in an incident such as fire, powerline contact, load drop, or crane tip-over, including evacuation and reporting.

A written record of an accident, near miss, or dangerous occurrence, used for investigation and to prevent recurrence.