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Elements and Performance Criteria

1. Prepare to diagnose and repair jet drive propulsion system
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
2. Diagnose propulsion system
   • Diagnostic tests are carried out according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including initial recommendations for necessary repairs or adjustments
3. Dismantle propulsion system
   • Tools, equipment and materials are selected and checked
   • Propulsion system is dismantled as required according to workplace procedures, and safety and environmental requirements
   • Propulsion system is cleaned and components arranged for inspection according to workplace procedures, and safety and environmental requirements
   • Propulsion system components are measured and compared with manufacturer specifications
   • Final repair recommendations are made and reported according to workplace procedures
4. Repair and reassemble propulsion system
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems
   • Propulsion system is reassembled according to manufacturer specifications, workplace procedures and safety requirements
   • Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified
5. Complete work processes
   • Final inspection is made to ensure work is to workplace expectations and vessel is presented ready for use or stored according to workplace procedures
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored according to workplace procedures
   • Workplace documentation is processed according to workplace procedures
6. Prepare to diagnose and repair jet drive propulsion system
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
7. Diagnose propulsion system
   • Diagnostic tests are carried out according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including initial recommendations for necessary repairs or adjustments
8. Dismantle propulsion system
   • Tools, equipment and materials are selected and checked
   • Propulsion system is dismantled as required according to workplace procedures, and safety and environmental requirements
   • Propulsion system is cleaned and components arranged for inspection according to workplace procedures, and safety and environmental requirements
   • Propulsion system components are measured and compared with manufacturer specifications
   • Final repair recommendations are made and reported according to workplace procedures
9. Repair and reassemble propulsion system
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems
   • Propulsion system is reassembled according to manufacturer specifications, workplace procedures and safety requirements
   • Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified
10. Complete work processes
    • Final inspection is made to ensure work is to workplace expectations and vessel is presented ready for use or stored according to workplace procedures
    • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
    • Tools and equipment are checked and stored according to workplace procedures
    • Workplace documentation is processed according to workplace procedures

Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.

Safety requirements must include:	work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for lifting and supporting jet drive propulsion systems.
Environmental requirements must include:	procedures for trapping, storing and disposing of fluids released from jet drive propulsion systems.

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Performance Evidence

Before competency can be determined, individuals must demonstrate they can perform the following according to the standards defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

diagnose and repair a fault in the following two jet drive propulsion systems in different marine vessels:

centrifugal

axial flow.

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Knowledge Evidence

Individuals must be able to demonstrate knowledge of:

work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing and repairing jet drive propulsion systems, including procedures for lifting and supporting jet drive propulsion systems

environmental requirements, including procedures for trapping, storing and disposing of fluids released from jet drive propulsion systems

operating principles of jet drive propulsion systems and associated components, including:

producing thrust using water pressure

changing vessel direction

application, purpose and operation of jet drive propulsion systems and components, including:

types of jet pumps, including:

centrifugal

axial flow

methods of reversing thrust, including:

cable-operated buckets

hydraulically-operated buckets

electrically-operated buckets

gearboxes

diagnostic testing procedures for jet drive propulsion systems, including:

housing to impeller clearance and wear

bearing wear

seal wear

bilge pump operation

gearbox operation

bucket operation

dismantling procedures for jet drive propulsion systems, including procedures for:

measuring clearances and tolerances

inspecting components

repair procedures for jet drive propulsion systems, including procedures for:

replacing impellers and housing

replacing bearings and seals, including oil replacement

replacing couplings

servicing buckets

post-repair testing procedures for jet drive propulsion systems, including procedures for water testing.

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