High Risk Work Licence - Non-Slewing Mobile Crane CN flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

CN Licence Scope

The CN high risk work licence authorises operation of non-slewing mobile cranes with a rated capacity greater than 3 tonnes. It does not cover slewing mobile cranes.

Duty of Care

A legal obligation on employers and workers to ensure health and safety so far as reasonably practicable, including providing information, training, and supervision.

Safe Work Method Statement

A document describing high risk construction work, the hazards, and the control measures. Work must be carried out in accordance with it.

Notifiable Incident

A death, serious injury, or dangerous incident that must be reported to the regulator immediately, with the site preserved until inspection.

Hierarchy of Control

A ranked order of risk controls: eliminate, substitute, engineering controls, administrative controls, then personal protective equipment as the last resort.

Exclusion Zone

An area around the crane and its load path where unauthorised persons are not permitted, set from the full working envelope.

Risk Score

The product of likelihood and consequence used to rank hazards and determine whether controls reduce risk to as low as reasonably practicable.

Stop-Work Condition

A situation where a hazard cannot be controlled within the lift plan or crane limits, requiring work to cease until the plan is revised.

Rated Capacity

The maximum load a crane may lift in a specific configuration, as stated in the manufacturer's load chart for that radius and boom length.

Working Radius

The horizontal distance from the crane's centre of rotation or boom pivot to the centre of gravity of the suspended load.

Gross Load

The total of the load, slings, rigging, hook block, and attachments. All of it counts against the rated capacity.

Pick-and-Carry Capacity

The reduced capacity for travelling with a suspended load, usually lower than static capacity and governed by a separate chart.

Pre-Start Inspection

A daily check of the crane before use, covering logbook, tyres, brakes, hydraulics, wire rope, hook, and safety devices.

Ground Bearing Pressure

The pressure imposed by the crane and load through each outrigger pad. The ground capacity must exceed it to prevent settlement or tipping.

Outrigger Setup

Fully extending and pinning outriggers on load-spreading pads on stable ground, with the crane level, before any lift.

Wire Rope Discard

Removal from service when broken wires, kinks, corrosion, or diameter reduction exceed the manufacturer's stated limits.

Working Load Limit

The maximum load a sling or lifting fitting may carry in a stated configuration; it must never be exceeded.

Sling Tension Formula

Tension per leg equals load divided by the number of legs multiplied by the sine of the angle from horizontal.

Centre of Gravity

The point where the load's weight is concentrated. An off-centre lift causes rotation and unequal loading on sling legs.

Load Estimation

Calculating load weight from volume multiplied by material density, for example steel at about 7850 kilograms per cubic metre.

Designated Signal Person

The single person appointed to direct the operator. All other persons relay signals through this person except emergency stop.

Emergency Stop Signal

A signal that any person may give. The operator must stop immediately regardless of who gives it.

Line of Sight Rule

The signal person must remain visible to the operator. If sight is lost, the lift stops until communication is restored.

Pre-Lift Briefing

A team meeting covering load weight, path, radius, signals, exclusion zones, and emergency arrangements before the lift begins.

Shock Loading

A sudden force from jerking or dropping a load, which can exceed the rated capacity. Avoid it by starting and stopping smoothly.

Travel with Load

Moving the crane while carrying a load, permitted only when the manufacturer allows it, with the load kept low and controlled.

Wind Limit

The maximum wind speed set by the manufacturer for safe lifting. Lifting stops when the load becomes uncontrollable.

Powerline Contact

If the crane contacts live lines, the operator stays in the cab and warns others away; if evacuation is required, jump clear and shuffle away.

Suspended Load Emergency

If a load cannot be lowered, establish an exclusion zone and seek competent assistance. Never leave a suspended load unattended.

Shutdown Procedure

Lower attachments, apply the parking brake, chock the wheels, isolate the battery, and secure the machine at the end of the shift.

Defect Classification

Defects are minor or major. A major defect requires the crane to be taken out of service immediately until rectified.

Major Inspection

A thorough inspection by a competent person after significant repair, alteration, or an incident affecting structural integrity, before return to service.