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Elements and Performance Criteria
Performance Evidence
An individual demonstrating competency must satisfy all of the elements and performance criteria in this unit.
There must be evidence that the individual has installed rigging equipment and controlled at least six loads from an aerial location to the drop zone using ropes, knots and rigging system appropriate for the load dimensions and mass.There must also be evidence that the individual has: confirmed work instructions and location of worksite identified site hazards, assessed risks and confirmed controls with supervisor including:selected, checked and used appropriate personal protective equipment confirmed the availability of first aid and emergency equipment, personnel and proceduresimplemented workplace health, safety, environmental and traffic control measurescontributed to tree assessment process by assessing trees for defects checked and removed defective equipment from servicemonitored rigging system, work team movements and environmental conditions for safe work conditionscommunicated with work team and discussed and confirmed rigging method and rigging equipment during operations using agreed communications methodstied, dressed, set and finished arborist knots according to rigging task, including demonstrating the following knots:alpine butterfly knotbowline on the bightcow hitch with better halfclove hitch and two half hitcheshalf hitch pre-knotklemheist friction knotmarline pre-knotmarline spike hitchriggers knot and two half hitchesrunning bowlinesheet bendslippery sheet bendtimber hitchzeppelin bendcontrolled load to drop zone, adjusting rigging according to aerial worker instructions and disconnected load from rigging systemreturned rigging components to aerial work team after checking components for defectsconfirmed completion of rigging operation with aerial work team and removed and dismantled rigging system including:cleaned, checked and stored tools and equipment from worksitereported and tagged defective tools and equipment recorded and reported rigging outcomes according to workplace procedures.All ground-based tree rigging work is required to be performed according to preferred industry practices (as outlined in the Companion Volume).
Knowledge Evidence
An individual must be able to demonstrate the knowledge required to perform the tasks outlined in the elements and performance criteria of this unit. This includes knowledge of:
current industry practices (as outlined in the Companion Volume) for ground-based tree rigging work and tree dismantlingsafe operations in ground-based rigging, including:first aid, emergency personnel, equipment and proceduresworkplace health, safety, site, environmental and traffic control measures identification of ground-based hazardsabove ground hazards and risk personal protective equipmentmonitoring the safety of working conditionsprocedures for tree assessment before rigging operations, including tree examination for tree defectsground-based rigging procedures and practices, including:rigging equipment and its performancerigging methods and rigging systemsexamination of rigging equipment for defects, and procedures to manage defective equipmentassembling and installing rigging equipmentchecking rigging equipmenttying, dressing, setting and finishing arborist knots for riggingcommunications strategies used in arboriculture, including:voicehandwhistle signalselectronic communicationscommunications specific to the rigging tasktechniques for controlling, raising, lowering and redirecting loads, including balancing load on centre of gravitycleaning, storing and maintaining tools and equipmentrecords and reporting procedures for rigging operations.