High Risk Work Licence - Bridge and Gantry Crane (CB) common mistakes
High Risk Work Licence - Bridge and Gantry Crane (CB) · Understand the traps and how to avoid them.
Treating the load chart as a single 'safe working load' number for the crane and ignoring that capacity varies with trolley position, span, and hoist configuration, so the candidate accepts a lift that is within the headline figure but over the actual rated capacity at that point on the bridge.
Candidates memorise one SWL from a familiar workplace crane and never practise reading a capacity curve or a trolley-position table; the chart is the least-drilled document in the course and often only appears in a quick classroom slide.
What to do instead
Before every practice lift, locate the trolley position, read the corresponding capacity from the chart, and say the figure aloud against the estimated load mass. Drill with two or three different chart formats so the candidate learns where the rated-capacity line, the structural limit, and the stability limit each sit.
Estimating load mass from a visual glance or from the number of items rather than calculating from known unit masses, density, or marked weights, and then adding rigging mass as an afterthought or not at all.
Experienced hands get away with eyeballing familiar loads, so estimation feels adequate; candidates also forget that slings, spreader beams, and shackles are part of the load the crane actually carries.
What to do instead
Require a written mass calculation for every planned lift during training: item mass times quantity, plus rigging mass, plus any attached fittings. Practise with loads of deliberately deceptive density (a small steel block versus a large empty drum) so the candidate stops trusting size.
Performing the pre-operational check as a walk-past ritual, ticking items without actually testing the limit switch, the hoist brake, the travel limit, or the emergency stop, and without recording defects.
Checklists are long, time pressure is real, and nothing has ever failed on the candidate's shift; the check is learned as a form to sign rather than a series of functional tests.
What to do instead
Train each check item as a physical action with an observable result, and have the candidate demonstrate the brake holding a test load, the limit switch tripping, and the e-stop cutting motion. Insist on a written defect record and a clear rule that an unrepaired safety defect stops the lift.
Rigging and slinging by habit - using slings at an unknown included angle, no edge protection, hook latch not closed, or a tag line omitted - without confirming the sling's rated capacity at that angle.
Slinging is often taught separately from crane operation and treated as someone else's job; angle derating is arithmetic the candidate has rarely applied under time pressure.
What to do instead
Make the candidate calculate sling tension at 30, 60, and 90 degree included angles for the same load, and show how quickly tension rises. Build a fixed slinging checklist - capacity, angle, edge protection, latch, tag line, balance point - that is verbalised before every practice lift.
Operating with people in the fall or travel zone, or under a suspended load, because the candidate assumes others will keep clear or that a verbal warning is sufficient.
In busy workshops, pedestrians cross crane bays constantly and operators learn to work around them rather than stop; the candidate has not internalised that a suspended load is an uncontrolled hazard to anyone beneath it.
What to do instead
Rehearse the stop-work response: motion stops, load is lowered where safe, and travel resumes only when the zone is clear. Practise setting and enforcing a physical exclusion zone with barriers and signage, and brief the candidate on the operator's authority and duty to halt the lift.
Relying on hand signals alone, or accepting a signal from anyone on the floor, instead of confirming one designated dogger and a rehearsed signal set including the emergency stop signal.
Radio failure and noisy environments are common, and candidates assume signals are universally understood; they also do not know who is authorised to direct the crane.
What to do instead
Drill the full standard signal set including stop and emergency stop, and practise a radio failure protocol where motion ceases until communication is re-established. Confirm at the pre-lift briefing who the single signaller is and that only that person's signals will be obeyed.
Travelling with a suspended load at height, or slewing and traversing simultaneously at speed, causing load swing that the candidate then chases with more counter-motion.
Swing control is a feel skill that only improves with repetition, and candidates under test conditions rush to finish; they also underestimate how much a long sling amplifies swing.
What to do instead
Practise plumb-line positioning at low height first, with the load brought to rest before each traverse, then build up speed only when the load arrives without pendulum motion. Teach the correction principle of moving the bridge in the direction of the swing rather than away from it.
Parking the crane at the end of a shift with the load still on the hook, the controls left live, the pendant or remote unsecured, or the crane left mid-span in a walkway, and then signing the logbook without noting the state of the equipment.
End of shift is treated as a race to the gate; shutdown is taught as a list on paper rather than as a physical sequence, and the logbook is seen as paperwork rather than a legal record.
What to do instead
Rehearse a fixed shutdown sequence - land and secure the load or land the empty hook, isolate and lock out where required, stow the pendant, park clear of walkways, apply rail clamps or anchor where fitted - and have the candidate write the handover entry describing defects, load left on the hook, and any isolation applied.
Failing to identify site-specific hazards before the lift: overhead power lines, adjacent crane overlap, floor loading and rail condition, wind on an outdoor gantry, or pedestrians from a neighbouring process, with no exclusion zone planned.
Candidates prepare for the crane they know and not for the site they arrive at; outdoor gantry work in particular brings wind and weather that classroom training barely touches.
What to do instead
Require a written site hazard scan before every practical lift, covering power lines, other cranes, ground and rail condition, wind limit, and pedestrian traffic, and have the candidate state the control for each. Include at least one outdoor session with a wind limit decision so the candidate practises stopping work rather than pushing on.
Describing the duty of care and licensing obligations in vague terms - 'be safe', 'have a ticket' - without naming the PCBU's primary duty, the operator's own duty, the high risk work licence class required, and the obligation to keep records and report incidents.
Legislation is studied as a text to recall rather than as rules that change what the operator does on the floor, so the knowledge does not attach to any behaviour.
What to do instead
Convert each legal duty into a concrete action the candidate performs: licence held and available for inspection, pre-start record completed, defect reported, incident notified, and the right to stop unsafe work exercised. Test with scenario questions where the candidate must name the duty, the person who holds it, and the action it requires.