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Elements and Performance Criteria

1. Inspect gas turbine engine system and components
   • Isolation tags already attached to the system or related systems are checked and aircraft/engine configured for safe system inspection and operation in accordance with applicable maintenance manual
   • Gas turbine engine and/or component are visually or physically checked for external and internal signs of defects in accordance with applicable maintenance manual
2. Test gas turbine engine system
   • Aircraft and gas turbine engine system are correctly prepared in accordance with applicable maintenance manual and connected to appropriate test equipment
   • Built-in system test functions and status displays are activated, where applicable, outputs recorded and interpreted
   • Assistance is provided with gas turbine engine and/or system operation during prescribed test procedures to establish serviceability and correct function in accordance with applicable maintenance manual
3. Prepare for troubleshooting
   • Relevant maintenance documentation and modification status, including system defect reports, where relevant, are used to identify an unserviceability
4. Troubleshoot gas turbine engine system
   • Available information from maintenance documentation and inspection and test results is used, where necessary, to assist in fault determination
   • Maintenance manual fault diagnosis guide and logical processes are used to ensure efficient and accurate troubleshooting
   • Specialist advice is obtained, where required, to assist with the troubleshooting process
   • Gas turbine engine system faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required
   • Fault rectification requirements are determined to assist in planning the repair

Required Skills

Required skills

Required Skills Look for evidence that confirms skills in applying relevant OHS procedures including lifting and handling of heavy components using MSDS and PPE using relevant maintenance documentation and aircraft manuals to through visualphysical inspection recognise external and internal signs of defects in gas turbine engines components and system components assist with testing of gas turbine engine and engine system operation be able to operate systems monitor indications record parameters and recognise correct function compile engine condition monitoring records rig and adjust engine controls and systems using fault diagnosis guides and equivalent data accurately and efficiently to troubleshoot the causes of unserviceabilities in gas turbine engines and engine systems clearly recording details and identifying the required rectification actions

Required knowledge

Look for evidence that confirms knowledge of fault diagnosis techniques gas turbine engine layout and operation types of gas turbine operating principles and power output gas path intakes compressors combustion chambers turbines exhaust thrust reversers accessory drives bearings and seals maintenance requirements and troubleshooting procedures system and component operation including electrical and instrument system interfaces fuel control and fuels lubrication and lubricants air distribution starting ignition power augmentation instrumentation performance indication condition indication warning presentation and interpretation of electronic displays fire warning and extinguishing control system and rigging of engine controls engine spinrun procedures including the operation of APUs engine condition monitoring relevant OHS practices including the requirements for the lifting and handling of heavy components how to obtain MSDS selection and use of PPE relevant maintenance manuals relevant regulatory requirements and standard procedures

Evidence Required

The Evidence Guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package
Overview of assessment	A person who demonstrates competency in this unit must be able to apply hand skills use maintenance publications and engine and system theory knowledge to inspect test and troubleshoot gas turbine engines and engine system components on fixed or rotary wing aircraft while applying all relevant safety precautions
Critical aspects for assessment and evidence required to demonstrate competency in this unit	The underlying skills inherent in this unit should be transferable across a range of inspection testing and troubleshooting applications including the timely involvement of supervisor or other trades associated with engine systems It is essential that system test procedures take into account all safety precautions associated with gas turbine engine system operation especially with regard to high energy ignition units and that awareness be demonstrated of dual inspection requirements associated with work on engine control systems Evidence of transferability of skills and knowledge related to inspection testing and troubleshooting is essential This may be demonstrated through application across a number of engine systems or engine types Ability to interpret inspection procedures and specifications allowable limits and apply them in practice is critical The application of testing procedures and functional rigging checks should also indicate knowledge of system operation Engine system operation knowledge the relationship of individual components and the links with other systems will be necessary to supplement evidence of ability to carry out rigging checks and troubleshoot the system within the limits of the aircraftsystem faultfinding guide before undertaking any action The work plan should take account of applicable safety and quality requirements in accordance with the industry and regulatory standards A person cannot be assessed as competent until it can be demonstrated to the satisfaction of the workplace assessor that the relevant elements of the unit of competency are being achieved under routine supervision on at least one item from each of Groups to in the Range Statement This shall be established via the records in the Log of Industrial Experience and Achievement or where appropriate an equivalent Industry Evidence Guide
Context of and specific resources for assessment	Competency should be assessed in the work environment or simulated work environment using tools and equipment specified in aircraft maintenance manuals It is also expected that general purpose tools test and ground support equipment found in most routine situations would be used where appropriate The level of troubleshooting is limited in its application to the use of fault diagnosis guides or other similar information
Method of assessment	Testing of engines fitted to helicopters where auxiliary drive is not available may be carried out through the applicant directing a pilot qualified on type
Guidance information for assessment

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Note	Range statements listed below are numbered to facilitate specification of the assessment requirements included in the Evidence Guide
Gas turbine engine and/or systems	Gas turbine engine and/or systems may include: 1. Engine change unit, main components and accessories/drives 2. Control system 3. Ignition and starter systems 4. Fuel system 5. Oil system 6. Air system
Troubleshooting	Troubleshooting involves the use of fault-finding charts or similar, to line replacement level
	Application of this unit may relate to: scheduled or unscheduled maintenance activities individual or team-related activities
Procedures and requirements	Refer to industry standard procedures specified by manufacturers, regulatory authorities or the enterprise

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