High Risk Work Licence - Tower Crane (CT) flashcards

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

PCBU primary duty

The person conducting a business or undertaking must eliminate risks to health and safety so far as reasonably practicable, and if not possible, minimise them.

Registrable plant

Tower cranes are registrable plant: the design must be registered before use and the item registered with the regulator, with records kept current.

Notifiable incident

A death, serious injury or dangerous incident such as a dropped load or structural failure must be reported to the regulator immediately by the fastest means.

Licence class limits

A tower crane licence authorises only tower crane operation; dogging, rigging and other crane classes each require their own licence or competency.

Operator duty of care

The operator must work within their licence and training, follow the lift plan, and stop the lift when conditions or the load make it unsafe.

Defect reporting duty

Any safety-related defect must be reported immediately, recorded in the logbook, and the crane taken out of service until repaired and re-inspected.

Hierarchy of control

Controls are applied in order: eliminate, substitute, engineering controls, administrative controls, and finally PPE as the last line of defence.

Exclusion zone control

Barricade the slew radius plus load radius and keep all people out of the zone for the entire lift; no person stands under a suspended load.

Load moment formula

Load moment equals load mass multiplied by radius. Capacity falls as radius increases, so the chart must be read at the actual working radius.

Rated capacity limiter

A safety device that prevents the load moment from exceeding the design limit by stopping hoist, trolley-out and slew movements when overloaded.

Luffing jib crane

A tower crane whose jib raises and lowers to change radius, used where slew clearance is restricted; it has its own load chart.

Hook inspection criteria

Check for cracks, deformation, throat wear and a functioning safety latch; a hook with a missing or damaged latch is out of service.

Pre-start function checks

Before lifting, test the rated capacity limiter, hoist and trolley limits, slew limit, brakes, anemometer and emergency stop for correct operation.

Wire rope discard

Reject rope showing broken wires in a lay, diameter reduction, corrosion, kinking or bird-caging, following the manufacturer's discard criteria.

Foundation design requirement

The foundation must be engineered for the crane's vertical, moment and shear reactions, and concrete strength confirmed before erection begins.

Erection SWMS

Erection and dismantling are high risk construction work requiring a safe work method statement, a lift plan and a competent erection crew.

Sling angle tension formula

For a two-leg sling, tension per leg equals load divided by two times the cosine of the angle from vertical; flatter angles raise tension.

Load chart deductions

Subtract the mass of the hook block, slings and lifting attachments from the chart capacity to obtain the net payload that can be lifted.

Centre of gravity control

The load's centre of gravity must sit under the hook; an off-centre load tilts, loads slings unevenly and may slip.

Dynamic load amplification

Sudden starts, stops or snatching increase the effective load above its static mass, so smooth control inputs are used to limit swing and shock.

Trolleying at capacity

Never trolley out with a load at the capacity limit; increasing radius raises the load moment and the limiter will stop the crane.

Tagline use

Taglines control load rotation; handlers stay outside the fall zone, keep the line clear of the body, and never wrap it around a hand.

Stop signal rule

Any person may give the stop signal, and the operator must stop immediately on any stop signal regardless of who gave it.

Blind lift protocol

When the operator cannot see the load or landing point, a spotter with a clear view directs the lift by agreed signals.

Communication failure

If radio contact is lost, the operator holds the load and waits for contact to be re-established or lands the load safely.

Wind speed limit

Lifting stops when wind speed reaches the manufacturer's rated limit; the anemometer must be working and monitored throughout the lift.

Powerline clearance

Maintain the legislated clearance from powerlines, use a spotter, and de-energise or isolate where possible rather than relying on judgement.

Out-of-service wind procedure

Follow the manufacturer's instructions for parking, slew-free mode and storm tie-down when wind exceeds the out-of-service limit.

End-of-shift securing

Land and secure the load, raise the hook, park the trolley per the manual, apply brakes, isolate power where required and log the shift.

Power failure response

The load remains suspended; keep the exclusion zone, use the manual lowering procedure if fitted, and call for assistance.

Post-incident crane status

After an incident the crane is out of service until inspected and cleared by a competent person and any regulator hold is lifted.