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Elements and Performance Criteria

1. Inspect two stroke petrol engine and components/systems
   • 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
   • Two stroke petrol engine and components/systems are visually or physically checked for external and internal signs of defects in accordance with applicable maintenance manual 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)
2. Test two stroke petrol engines
   • Aircraft and engine are correctly prepared in accordance with applicable maintenance manual
   • Assistance is provided with engine and/or system operation during prescribed test procedures to establish serviceability and correct function in accordance with applicable maintenance manual
3. Troubleshoot two stroke petrol engines
   • 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
   • Two stroke petrol engine 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
4. Remove two stroke petrol engine and engine system components
   • Aircraft is prepared and supported and rendered safe in accordance with the applicable maintenance manual and isolation tags are fitted, where necessary, to ensure the safety of personnel and freedom from damage during engine removal
   • Removal is carried out in accordance with the applicable maintenance manual while observing all relevant WHS requirements, including the use of MSDS and items of PPE
   • Engine is tagged and prepared for transport or storage in accordance with the specified procedures
   • Required maintenance documentation is completed and processed in accordance with standard enterprise procedures
5. Install two stroke petrol engine and engine system components
   • Engine to be installed is checked to confirm correct part or model numbers, modification status and serviceability
   • Installation is carried out in accordance with the applicable maintenance manual while observing all relevant WHS requirements, including the use of MSDS and items of PPE
   • Support/safety equipment is removed at the appropriate time to ensure personnel safety and freedom from structural damage
   • Required maintenance documentation is completed and processed in accordance with standard enterprise procedures

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.
Two stroke engines and components/systems include:	Two stroke petrol aircraft engines, main components, including reduction gearboxes and accessories/drives Ignition systems Control systems Starter systems Fuel and air systems Cooling systems (liquid or air as applicable to enterprise) Exhaust systems
Testing of engines includes:	Testing of engines fitted to helicopters (where auxiliary drive is not available) shall be carried out through the applicant directing a pilot qualified on type
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 the use of PPE and MSDS

using relevant maintenance documentation and aircraft manuals

recognising external and internal signs of defects in two stroke petrol aircraft engines, components and system components through visual/physical inspection

assisting with testing of two stroke petrol engine and engine system operation, be able to operate systems, monitor indications, record parameters and recognise correct function

compiling engine condition monitoring records

rigging and adjusting engine controls and systems

using fault diagnosis guides and equivalent data to accurately and efficiently troubleshoot the causes of unserviceabilities in two stroke petrol engines and engine systems, clearly record details and identify the required rectification actions

correctly removing and installing two stroke petrol engine and engine components.

The underlying skills inherent in this unit should be transferable across a range of inspection, testing, troubleshooting and removal and installation tasks (including the timely involvement of supervisor or other trades) associated with two stroke petrol aircraft engines and engine. It is essential that system testing procedures take into account all safety precautions associated with two stroke petrol engine system operation and that awareness be demonstrated of dual inspection requirements associated with work on engine controls. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice is critical.

This shall be demonstrated through application across a number of engine systems or types.

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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:

WHS procedures associated with engine maintenance, including lifting and handling of heavy objects and how to obtain PPE and MSDS

fault diagnosis techniques

two stroke petrol aircraft engine layout and operation:

principles of operation of two stroke engines

component function, construction and materials

engine operation

engine power, efficiency and performance

two stroke aircraft engine fuels, oils and fuel/oil mixing

components, layout and operation of two stroke petrol aircraft engine:

fuel systems

ignition systems:

magneto

coil

spark plugs

ignition harnesses

switches

starting systems

induction systems

cooling systems (liquid and air)

exhaust systems

electrical and instrument system interfaces:

battery charging system

tachometer

removal and installation procedures for two stroke petrol aircraft engines and engine components

petrol two stroke aircraft engine maintenance requirements and troubleshooting

relevant maintenance manuals

relevant regulatory requirements and standard procedures.

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