Intermediate Rigging (RI) study plan

Define working load limit, center of gravity, and the safety-factor basis for wire rope, chain, and synthetic slings, and state the numeric factor for each.

Calculate the tension in each leg of a two-leg and a four-leg bridle using the load-weight, leg-angle relationship, and compare the result to a single vertical hitch.

Compute load moment and verify stability by locating the combined center of gravity of an asymmetric load before choosing pickup points.

Apply the reduced-capacity rule for non-vertical slings and record when a leg angle makes a hitch unsuitable.

Identify the required markings on slings and hardware, and explain what an illegible or missing tag implies for use.

Describe the inspection criteria that remove a wire rope sling from service, including broken wires, kinking, and core protrusion.

List the removal criteria for chain slings and synthetic web slings, including stretch, cuts, and ultraviolet damage.

Select a sling type and capacity for three given loads by matching hitch type, angle, and environment.

Differentiate shackle types and pin retention methods, and state the correct orientation of the shackle body under load.

Explain how hooks, master links, swivels, and eyebolts are rated, and identify the conditions that void a rating.

Determine the capacity loss when a sling contacts a sharp edge and describe the padding or protection required.

Verify that rigging hardware is matched to sling capacity so the assembly is limited by its weakest component.

Read a load chart and extract capacity for a given radius, boom length, and configuration, interpolating between tabulated values.

Distinguish gross capacity from net capacity and deduct the weights of the hook block, rigging, and attachments.

Identify the notes and footnotes that govern a chart, including area-of-operation limits and structural versus stability ratings.

Explain how outrigger configuration, ground bearing, and boom deflection affect the usable capacity.

Draft a lift plan that states load weight, rigging weight, radius, capacity, and the resulting utilization percentage.

Classify a lift against common critical-lift thresholds and justify the classification in writing.

Compute ground bearing pressure under each outrigger and compare it to a stated soil capacity.

Identify hazards from power lines, underground utilities, and adjacent structures, and specify the controls for each.

State the standard hand signals for hoist, lower, stop, and emergency stop, and describe the fallback when line of sight is lost.

Define the roles of signalperson, rigger, and operator, and explain who may direct the operator and when anyone may stop the lift.

Describe pre-lift communication, including the pre-lift meeting agenda and radio protocol for a blind lift.

Sequence a lift from rigging through set-down, naming the hold points and verification steps at each stage.

Diagnose common execution failures such as shock loading, side loading, and swing-out, and state the corrective action for each.

Rehearse the response to an unplanned event, including load drift, tag-line loss, and a failed sling.

Re-derive load calculations for a multi-point pick with an offset center of gravity and confirm the tension distribution.

Explain tag-line placement and control for a load with a large sail area in wind.

Complete a full-length timed practice exam weighted to the domain percentages and review every missed item to its source concept.

Recompute the five load calculations most often missed and confirm each against the formula sheet.

Recite the inspection rejection criteria for all three sling types and the hardware rating rules from memory.

Build a personal error log and convert each recurring error into a one-line rule for exam day.