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Elements and Performance Criteria

1. Prepare for underwater air-lift operation
   • Identify and analyse load metrics and worksite data to determine specific requirements for air-lift bags
   • Develop a work plan consistent with dive plan
   • Select, inspect and prepare air-lift bags in accordance with manufacturer specifications and safe weight limits
   • Secure air-lift bags to/from dive site
   • Assess obstructions and other underwater hazards to determine risks and manage risk control measures in accordance with dive plan
2. Operate air-lift devices
   • Secure air-lift bags to object’s lift point/s
   • Determine a safe work area, confirm location of other divers and nearby vessels and/or structures prior to commencing and during air-lift operation, in accordance with work plan
   • Inflate air-lift bags in accordance with work plan
   • Control buoyancy and movement in accordance with work plan
3. Complete air-lift operations
   • Minimise environmental impact arising from work task and recover waste products
   • Carry out de-servicing and storage requirements for air-lift bags

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the Companion Volume Implementation Guide.

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include: applying centre of gravity of lifted object applying relevant legislation, standards and organisational policies and procedures applying underwater risk control measures and work plan requirements controlling neutrally buoyant objects coordinating with other operators during lift demonstrating air-lift operations with manually inflated air bags including: 1 x vertical lift to surface 1 x lateral lift determining hydrodynamics of object as it is raised through the water developing underwater air-lift work plan rigging and de rigging air-lift equipment.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of: calculations to determination hydrodynamics, centre of gravity and mass of submerged objects characteristics and employment of airlift bags dive equipment dive physics dive physiology and medicine including: heat and cold illnesses compression illnesses decompression illnesses diving descent and ascent techniques general diving safety awareness including: diving in harbours diving in tidal waters, currents and tides diving on and/or near a ship’s bottom lost/separated entrapment/foul lines marine animal threats pollution/weeds working in confined spaces oceanography relevant manufacturer specifications relevant marine workplace hazards relevant legislation, standards and organisational policies and procedures.

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