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Elements and Performance Criteria

1. Inspect twin engine aircraft electrical systems and 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 while observing all relevant work health and safety (WHS) requirements
   • Direct current (DC) electrical system is visually or physically checked for external signs of defects in accordance with applicable maintenance manual
   • Defects are correctly identified and reported
2. Test/adjust twin engine aircraft electrical systems
   • Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation
   • Electrical 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 twin engine aircraft electrical systems
   • Available information from maintenance documentation and 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
   • System faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required, and in accordance with standard enterprise procedures
   • Rectification requirements are determined
4. Remove and install twin engine aircraft electrical system components
   • System is rendered safe and prepared in accordance with the applicable maintenance manual and isolation tags are fitted, where necessary, to ensure personnel safety
   • Electrical component removal is carried out in accordance with the applicable maintenance manual while observing all relevant WHS requirements
   • Required maintenance documentation is completed and processed in accordance with standard enterprise procedures
   • Removed components are tagged and packaged in accordance with specified procedures
   • Electrical components to be installed are checked to confirm correct part numbers, modification status, serviceability and shelf life
   • Physical installation of electrical components is performed in accordance with the applicable maintenance manual, ensuring appropriate adjustment/alignment with mechanical interface is carried out
   • System is reinstated to correct operational condition in preparation for testing, as necessary

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.
DC electrical systems include:	DC multi-generator and alternator/rectifier generator regulation and distribution systems and components Electrical propeller control systems, such as feathering systems (where applicable to the enterprise) Batteries in dual battery installations and associated mounting equipment, including related anti-vibration aids Fire warning and extinguishing systems, including handling of halogen fire extinguishers (where applicable to the enterprise) Combustion heating systems (where applicable to the enterprise) Equipment cooling and ventilation Fuel storage and distribution systems Master and central warning systems (where applicable to the enterprise)
Electrical components include:	Components of multi-generator regulation and distribution systems Electrical propeller control system components (where applicable to the enterprise) Batteries in dual battery installations and associated mounting equipment, including related anti-vibration aids Fire warning and extinguishing system components (where applicable to the enterprise) Combustion heaters and associated components (where applicable to the enterprise) Equipment cooling and ventilation components Fuel storage and distribution system electrical components Master and central warning system components (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

using approved maintenance documentation and aircraft publications relating to twin engine aircraft electrical systems

identifying/locating:

DC multi-generator power generation, regulation, distribution and control systems and components, i.e. regulators and bus bars

electrical propeller control systems and components, such as feathering and synchronising systems

batteries in dual battery installations and associated mounting equipment, including related anti-vibration aids

fire warning and extinguishing systems and components

identification of halogen (e.g. BCF) fire extinguishers

combustion heating systems

equipment cooling and ventilation

fuel storage and distribution system electrical components

master and central warning systems

correctly connecting DC generators and alternator/rectifier generators in multi-generator systems and paralleling generator output

recognising system and component defects/external damage, correct installation, connection of plugs, terminations, attaching hardware (including cabling/harnesses) and security in the above systems and system components

applying logic processes, taking and interpreting electrical measurements, using test equipment and appropriate wiring diagrams and manuals to isolate malfunctions in the above systems

performing system functional tests and checks to isolate system faults and assess post-maintenance serviceability.

It is essential that system testing procedures, cleanliness requirements and safety precautions applicable to the electrical 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 and component removal and installation is essential. This is to be demonstrated through application across a range of aircraft electrical 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:

system testing procedures and paralleling of generator output

the basic layout (block diagram level), function and operation of:

DC multi-generator and alternator/rectifier generator regulation and distribution systems and components

electrical propeller control systems, such as feathering and synchronising systems and system components

dual battery systems and associated mounting equipment, including related anti-vibration aids

fire warning and extinguishing systems and system components, including regulatory requirements relating to halogen (e.g. BCF) fire extinguishers

combustion heating systems and system components

equipment cooling and ventilation systems and system components

fuel storage and distribution systems and system components

master and central warning systems and system components

maintenance requirements and troubleshooting procedures for the above electrical systems

relevant WHS practices

relevant maintenance manuals

relevant regulatory requirements and standard procedures.

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