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Elements and Performance Criteria

1. Inspect propeller systems and components
   • Isolation tags already attached to the system or related systems are checked and aircraft configured for safe system inspection and operation in accordance with applicable maintenance manual
   • Propeller system is visually or physically checked for rigging and external 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 propeller systems
   • Aircraft and system are correctly prepared, in accordance with maintenance manual, for the operation of engine and propeller system
   • Propeller and system are functionally tested in accordance with applicable maintenance manual for evidence of malfunction or defects
   • System calibration or adjustments are performed in accordance with applicable maintenance manual
3. Prepare for troubleshooting
   • Relevant maintenance documentation and modification status, including system defect reports, where relevant, are interpreted to identify an unserviceability
4. Troubleshoot propeller systems
   • 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
   • Propeller 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

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.
Propeller and propeller systems include:	Propellers, including spinners, where fitted Constant speed, feathering and reversing propeller drives Beta control systems and governors Controls and linkages De-ice/anti-ice equipment (where applicable to the enterprise)
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 practices, including the lifting and handling of heavy components

using relevant maintenance documentation and aircraft manuals to:

recognise, through visual/physical inspection, external signs of defects or rigging abnormalities in propellers and propeller system components

functionally test propellers and propeller systems and recognise any indication of malfunction or incorrect rigging or adjustment

rig and adjust propeller controls and systems

using fault diagnosis guides and equivalent data to accurately and efficiently troubleshoot the causes of unserviceabilities in propellers and propeller 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 supervisors or other trades) associated with propeller systems. It is essential that system test procedures take into account all safety precautions associated with propeller system operation, and that awareness be demonstrated of dual inspection requirements associated with work on propeller control systems.

This shall be demonstrated through application across a number of propeller systems or propeller types. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice is critical.

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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

propeller system layout and operation:

propeller types

propeller terminology

forces acting on a propeller

propeller construction

propeller operation

pitch changing mechanisms

governors and beta control

controls and rigging of propeller controls

maintenance requirements and troubleshooting procedures

ancillary systems and system component operation, including electrical and instrument system interfaces:

de-icing and anti-icing

multi-engine synchronising and synchrophasing

feathering and unfeathering, including auto feathering

pitch reversal

negative torque sensing and protection

de-coupling

braking

thrust and torque measuring and indication

maintenance requirements and troubleshooting procedures

relevant WHS practices, including the requirements for the lifting and handling of heavy components

relevant maintenance manuals

relevant regulatory requirements and standard procedures.

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