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Elements and Performance Criteria

1. Inspect oxygen system components
   • Relevant maintenance documentation and modification status, including system defect reports, where relevant, are used to identify specific inspection requirements
   • Isolation tags are checked and aircraft configured for safe system inspection and operation in accordance with the applicable maintenance manual
   • Oxygen system components are visually or physically checked for external signs of defects in accordance with applicable maintenance manual while observing all relevant work health and safety (WHS) requirements
   • Defects are correctly identified and reported
2. Test/adjust oxygen systems
   • Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation
   • Oxygen system is functionally tested in accordance with maintenance manual for evidence of serviceability or malfunction
   • System calibration or adjustments are performed in accordance with maintenance manual, as appropriate
3. Troubleshoot oxygen systems
   • Available information from maintenance documentation, inspection and test results is used, where necessary, to assist in fault determination
   • Maintenance manual fault diagnosis guides and logic processes are used to ensure efficient and accurate troubleshooting to line replacement level
   • Specialist advice is obtained, where required, to assist with the troubleshooting process
   • Oxygen system faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required
   • Rectification requirements are determined

Range Statement

This field allows for different 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.
Oxygen system components include:	Oxygen pressure cylinders, valves and gauges Regulators, masks (including other integrated systems), pipes, hoses and fittings Chemical generators (where applicable to the enterprise) Liquid dry breathing oxygen (LDBO) converters (where applicable to the enterprise)
Troubleshooting includes:	The use of fault-finding charts or similar, to line replacement level
Procedures and requirements include:	Industry standard procedures specified by manufacturers, regulatory authorities or the enterprise

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Performance Evidence

Evidence required to demonstrate competency in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria under the specified conditions of assessment, and include:

applying appropriate WHS practices

using approved maintenance documentation and aircraft publications relating to aircraft oxygen systems and components for the purpose of system testing

general application of logical fault-finding and use of truth tables during troubleshooting

interpreting oxygen system instruments, gauges, warning annunciators and test equipment, i.e. leak detectors

applying the methods used to locate, identify and access oxygen system components for inspection, testing and troubleshooting

demonstrating the procedure to replenish a dry breathing oxygen system, including:

correct identification of oxygen ground trolleys

maximum charging pressures for low and high pressure systems

safety precautions to be adhered to during replenishment

correct order of procedural replenishment steps

demonstrating the procedure to purge a dry breathing oxygen system, including:

reasons for the requirement to undertake a purging operation

identification of acceptable system purging gases

safety precautions to be adhered to during purging

employing correct techniques when purging oxygen storage cylinders or systems.

It is essential that system testing procedures, cleanliness requirements and safety precautions applicable to the oxygen system being maintained are fully observed, understood and complied with. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice across a range of inspection, testing and troubleshooting applications (including the timely involvement of supervisors or other trades) is critical.

Evidence of transferability of skills and knowledge related to inspection, testing and troubleshooting is essential. This is to be demonstrated through application across a range of aircraft oxygen systems and components listed in the Assessment Conditions.

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Knowledge Evidence

Evidence required to demonstrate competency in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

component attachment methods, connection of hardware and couplings and their physical security within the aircraft

oxygen system isolation

properties of aircraft oxygen and requirements for aircrew/passengers

properties of the atmosphere and how they vary

defining terms and units of measurement relating to aircraft altitude and system pressures

layout of low and high-pressure dry breathing oxygen systems and components

operation of oxygen systems and components, including:

pressure demand regulators

passenger service regulators

altitude sensing barometers

methods by which gaseous dry breathing oxygen is stored in both the aircraft and within the workplace environment. Reference to storage trolleys, aircraft cylinders and chemical oxygen cylinders is required

oxygen system maintenance requirements and troubleshooting procedures

relevant WHS practices

relevant maintenance manuals

relevant regulatory requirements and standard procedures.

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