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Elements and Performance Criteria

1. Prepare for troubleshooting
   • Relevant maintenance documentation and modification status, including system defect reports, where relevant, are interpreted to identify an unserviceability
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 while observing all relevant work health and safety (WHS) requirements, including the use of material safety data sheets (MSDS) and items of personal protective equipment (PPE)
   • 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. 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 to line replacement level
   • Specialist advice is obtained, where required, to assist with the troubleshooting process
   • Gas turbine engine system faults are located and 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 or adjustment

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.
Gas turbine engine systems include:	Engine change unit, main components and accessories/drives Control system Ignition and starter systems Fuel system Oil system Air system
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 must include:

applying relevant WHS procedures, including lifting and handling of heavy components

using MSDS and PPE

using relevant maintenance documentation and aircraft manuals to:

recognise through visual/physical inspection 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, to accurately and efficiently troubleshoot the causes of unserviceabilities in gas turbine engines and engine systems, clearly record details and identify the required rectification actions.

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.

This shall be demonstrated through application across the engine systems 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:

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 spin/run procedures including the operation of auxiliary power units (APUs)

engine condition monitoring

relevant WHS 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.

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