NCCO cheat sheet

Ground bearing pressure (GBP) = total crane weight plus load, divided by the bearing area of the outrigger float or mat; compare against the soil's allowable bearing capacity from a geotechnical assessment.

Outrigger float pressure rises sharply with extension: use the manufacturer's load chart values rather than estimating, because pressure is a function of boom radius, boom angle, and swing position.

Minimum clearance from energized power lines follows local regulation; where the operator cannot maintain the required distance, use a dedicated spotter and a documented de-energization or barrier plan.

Load charts are configuration-specific: deduct the weight of the hook block, slings, shackles, and any jib or auxiliary head before comparing net capacity with the load.

Slope limit: cranes must be set up level within the manufacturer's tolerance (commonly 1 percent); use a level on the carrier frame, not the cab floor.

Exclusion zone: the swing radius plus the greater of the load radius or a defined minimum must be barricaded; tag lines control rotation but never substitute for a barricade.

Soft spots, backfilled trenches, vaults, and utility covers are common causes of outrigger punch-through; mat size is determined by GBP, not by convenience.

Wind: capacity derating applies above the chart's stated wind speed, and sail area of the load increases side load; stop when the manufacturer's limit is reached.

Sling tension in a two-leg bridle: tension per leg = (load weight / number of legs) / cos(angle from vertical); at 60 degrees from vertical, each leg carries the full load.

Vertical hitch capacity equals the sling's vertical rating; choker reduces it (commonly to about 75-80 percent), basket typically doubles it only if legs are vertical and the choke angle is favorable.

Sling angle factor: capacity multiplier = cos(angle from horizontal) for basket and bridle legs; flatter angles dramatically reduce usable capacity.

Shackle selection: working load limit must meet or exceed the calculated leg tension, and the pin must be fully seated with the load bearing on the bow, not the pin, where the design requires it.

Center of gravity must be below or at the lift point; for asymmetric loads, use two or more pick points and verify with a trial lift just clear of the ground.

Edge protection is mandatory where synthetic slings contact sharp corners; damaged slings are removed from service, never field-repaired.

Tag line rule: one person per line, positioned outside the swing radius, never wrapping the line around a hand or body part.

Rigging hardware inspection: reject hooks with cracks, throat opening greater than the manufacturer's limit (often 10 percent), or missing safety latches.

Pre-shift walkaround covers wire rope (broken wires, kinks, bird-caging, corrosion), sheaves, drums, hook latch, boom pins, outrigger beams and pads, and fluid leaks.

Wire rope removal criteria are based on the manufacturer's or standard's broken-wire count per lay length, plus diameter reduction and any valley corrosion.

Load moment indicator or rated capacity limiter must be calibrated and functioning; operating with a bypassed or inoperative safety device is prohibited.

Anti-two-block device, boom angle indicator, level indicator, and horn must be tested before each shift; record the result on the inspection form.

Frequent inspections are performed at intervals set by the manufacturer or standard (often monthly to quarterly) and include items not visible in the daily check.

Periodic inspections are more thorough and typically annual, performed by a qualified person, with written records retained per the applicable standard.

Maintenance log must show date, defect found, corrective action, and the person who performed it; defects affecting safety ground the crane until corrected.

After a shock load, contact with a power line, or a tip-over, the crane requires a documented inspection before returning to service.

Only one designated signal person directs the operator at a time; anyone may give a STOP signal, and the operator must obey it from any source.

Standard hand signals cover hoist, lower, boom up/down, swing, stop, emergency stop, and dog everything; voice or radio communication requires a dedicated channel and clear identification.

The operator stops when the signal is unclear, the load is out of view without a signal person, or communication is lost; resume only after re-establishing contact.

Travel with a load follows the manufacturer's chart and site rules; a suspended load must be kept as low as practical and never carried over personnel.

Before any lift, the lift plan is briefed to the operator, rigger, signal person, and spotter, covering load weight, rigging, path, set-down, and emergency stop.

Swing and trolley motions are smooth; sudden starts and stops create pendulum swing and dynamic amplification of the load.

Never leave the operator station with a load suspended; if the operator must leave, land the load and secure the crane.

Radio protocol: identify the crane, state the command, and require acknowledgment; use plain language for critical commands and repeat back.

Net capacity = gross chart capacity minus the weight of all lifting attachments below the boom tip, including hook block, slings, and spreader bars.

Dynamic load factor: rapid hoisting or stopping can add on the order of 10-30 percent to the static load; the chart's ratings already assume some allowance, so smooth operation is required.

Radius is measured from the center of rotation to the center of the load, not to the boom tip; boom deflection increases the actual radius.

Stability is reduced by boom length, radius, and swinging the load over the side or corner; the load chart's structural and stability limits both apply, and the lower governs.

Quadrant and over-the-side ratings differ; always use the chart for the actual configuration, including outrigger extension and counterweight.

Wind and sail area act as lateral loads and reduce effective capacity; the manufacturer's wind speed limit is a hard stop.

Load moment = load weight times radius; the load moment indicator compares measured moment against the chart's allowable moment for the configuration.

Trial lift: raise the load a few inches, verify stability, brake holding, and rigging balance before committing to the full lift path.

Power line contact: stay in the cab, warn others away, and do not touch the crane or load; if the operator must exit, jump clear and shuffle away without touching the crane and ground simultaneously.

Loss of control or impending tip-over: lower the load if possible, sound the horn, and follow the site emergency plan; never attempt to catch or steady a falling load.

Fire: shut down the engine if safe, use the appropriate extinguisher, and evacuate; hydraulic fluid fires require the correct class of agent.

Injury or fatality: preserve the scene, secure the area, and notify the site supervisor and authorities per the site emergency plan; do not move equipment unless needed to prevent further harm.

Load drop or rigging failure: clear the drop zone, account for all personnel, and quarantine the failed hardware for inspection.

Emergency lowering: know the manufacturer's procedure for lowering a boom or load without power, and the location of the emergency controls.

Incident reporting: record time, configuration, load weight, radius, weather, and witnesses; the report supports root-cause analysis and corrective action.

Drills: rehearse power-line contact, fire, and evacuation scenarios so response is automatic under stress.

Operator duties typically include being trained and qualified for the specific crane type, knowing the load chart, and refusing unsafe lifts.

The operator is responsible for the lift only when the lift plan, signals, and site conditions are within their control; unclear or unsafe instructions are escalated, not obeyed.

Riggers and signal persons also require qualification; the employer must document training and competency.

Pre-use inspection records, maintenance logs, and load test certificates must be available for inspection; missing documentation can stop the lift.

Manufacturer's operator manual and load charts are the governing documents for capacity and configuration; site rules may be stricter but not less safe.

Lockout/tagout and energy isolation apply during maintenance; the crane must be secured against unexpected startup.

Report defects and near misses through the site's system; near-miss reporting is a leading indicator and is often required by the safety management plan.

Regulatory frameworks vary by jurisdiction (for example OSHA in the US, CSA in Canada, or the applicable national standard); cite the specific rule in the lift plan.

Pre-lift sequence: verify level and setup, check the chart for the configuration, confirm load weight and rigging, brief the crew, and test the horn and limits.

Smooth control inputs: feather the controls, avoid simultaneous opposing motions, and anticipate swing lag; the load follows the boom with a delay.

Swing control: lead the load with the swing, brake early, and use tag lines to stop rotation; never use the load to push or pull.

Landing the load: lower slowly, verify the set-down point is clear and stable, and only then release tension; keep hands clear of pinch points.

Boom deflection and radius: check the actual radius at the load's position, especially at long boom lengths, before trusting the chart value.

Blind lifts require a signal person with a clear view or a documented alternative; the operator must stop when the load is out of sight.

Parking and shutdown: land the load, retract the boom per the manual, set the brake, and secure the machine against wind and unauthorized use.

Evaluation of practical performance focuses on setup, chart use, smooth control, communication, and recognition of unsafe conditions.