Construction Crane Operators (Machineries and Crane Operation)
This domain covers the machinery and operational side of the CIC crane operator assessment: crane types and configurations, load charts and rated capacity, stability and ground conditions, safety devices, inspection, and communication during lifts on Hong Kong construction sites. Questions often test whether you can apply the manufacturer's capacity data to a real setup rather than recite a single SWL.
Capacity, radius and configuration
The rated capacity is the maximum gross load permitted for a specific configuration-boom length, counterweight, outrigger spread, and radius. Radius is the horizontal distance from the slewing centre to the load's centre of gravity, not the boom length. As radius increases, capacity falls. Gross load includes the load, hook block, slings, spreader beams and any attached gear below the hook; compare that total with the chart value. A load chart must be available in the cab.
Stability and setup
Mobile cranes must be set up with outriggers fully extended on firm, level ground, using pads or mats to spread bearing pressure. Never set up over trenches, backfilled ground or drains without an engineered assessment. Tower cranes depend on foundation, tie-in and erection/dismantling being supervised by a competent engineer. Safety devices-load moment indicator, anti-two-block, hoist limits, slew brake, anemometer and outrigger interlocks-must be tested and never overridden.
Inspection, communication and limits
Pre-use checks and thorough examinations under the Factories and Industrial Undertakings (Lifting Appliances and Lifting Gear) Regulations must be current. A competent signaller/banksman directs the lift; use agreed hand signals or radio, one signaller only, and tag lines for control. Stop when wind exceeds the manufacturer's limit or when lightning is near.
Worked example. A mobile crane is configured with outriggers fully extended, boom length 30 m. The chart at 12 m radius gives 8.0 t. The load is 6.5 t, hook block 0.3 t, slings 0.2 t. Gross = 6.5 + 0.3 + 0.2 = 7.0 t. Remaining margin = 1.0 t, so the lift is within the chart. If the ground cannot support the outrigger load, the lift is still unsafe and must be re-planned with mats or a larger crane.
Traps. Using boom angle instead of radius; reading a chart for the wrong outrigger configuration; ignoring gear weight; side-loading or dragging loads; shock loading; overriding limiters; and assuming a crane can lift near its chart limit in wind.