Unit of competency Outline
Date retreived
22/07/2026 5:31 AM AWST
22/07/2026 5:31 AM AWST
Whilst all efforts are made to provide accurate and timely information from the relevant source/documentation, please be aware that the information supplied may not be the most current version. The accuracy of the detail has not been confirmed by the Department and therefore should not be relied upon without first confirming the contents.
Test and troubleshoot aircraft electrical systems and components
Test and troubleshoot aircraft electrical systems and components
Unit of competency
National Code
MEA227C
MEA227C
State Code
D4441
D4441
TGA Status
Replaced
Replaced
DTWD Status
Replaced
Replaced
State Implementation and Classification
Approved Date
06/05/2011
Field of Education
031503 - Aircraft Maintenance Engineering
Original Release Date
06/05/2011
Nominal Hours
110
Description
This unit is part of the Avionic Certificate IV training pathways and is also part of the Mechanical Aircraft Maintenance Engineer licensing pathway. It covers the competencies required to test and troubleshoot electrical systems and components of fixed and rotary wing aircraft. Where a CASA licensing outcome is sought this unit forms part of the CASA requirement for the granting of the chosen B1 or the B2 Aircraft Maintenance Engineer Licence under CASR Part 66, in accordance with the licensing provisions in Section 3, Assessment Guidelines.
Notes
Elements and Performance Criteria
1. Prepare for troubleshooting
- 1.1. Relevant maintenance documentation and modification status, including system defect reports, where relevant, are used to identify an unserviceability.
2. Test/adjust electrical systems.
- 2.1. Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation.
- 2.2. Electrical system is functionally tested, in accordance with maintenance manual, for evidence of serviceability or malfunction.
- 2.3. System calibration or adjustments are performed in accordance with maintenance manual, as appropriate.
3. Troubleshoot electrical systems.
- 3.1. Available information from maintenance documentation and inspection and test results is used, where necessary, to assist in fault determination.
- 3.2. Maintenance manual fault diagnosis guides and logic processes are used to ensure efficient and accurate troubleshooting.
- 3.3. Specialist advice is obtained, where required, to assist with the troubleshooting process.
- 3.4. System faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required.
- 3.5. Rectification requirements are determined.
Note
Range statements listed below are numbered to facilitate specification of the assessment requirements included in the Evidence Guide.
1. AC and/or DC power generation, regulation and distribution systems
2. Rotary and static inverters and TR units
3. Air cycle air conditioning and pressurisation systems
4. Flight and engine control systems
5. Ignition and starting systems
6. Fire/smoke detection and extinguishing
7. Lighting (internal and external)
8. Master and caution warning systems
9. Equipment cooling and ventilation
10. Equipment and furnishing
11. Position indicating systems
12. Fuel storage and distribution
13. Landing gear indication and antiskid
14. Main batteries and battery bus ties/interlocks
15. Propeller control systems
16. Ice and rain protection
17. Waste water
Scheduled or unscheduled maintenance activities
Individual or team related activities
Refer to industry standard procedures specified by manufacturers, regulatory authorities or the enterprise
Range statements listed below are numbered to facilitate specification of the assessment requirements included in the Evidence Guide.
1. AC and/or DC power generation, regulation and distribution systems
2. Rotary and static inverters and TR units
3. Air cycle air conditioning and pressurisation systems
4. Flight and engine control systems
5. Ignition and starting systems
6. Fire/smoke detection and extinguishing
7. Lighting (internal and external)
8. Master and caution warning systems
9. Equipment cooling and ventilation
10. Equipment and furnishing
11. Position indicating systems
12. Fuel storage and distribution
13. Landing gear indication and antiskid
14. Main batteries and battery bus ties/interlocks
15. Propeller control systems
16. Ice and rain protection
17. Waste water
Scheduled or unscheduled maintenance activities
Individual or team related activities
Refer to industry standard procedures specified by manufacturers, regulatory authorities or the enterprise
Overview of assessment
A person who demonstrates competency in this unit must be able to test and troubleshoot DC and AC electrical systems and components, including looms, cables and connection hardware, while observing 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 testing and troubleshooting applications (including the timely involvement of supervisors or other trades) associated with aircraft electrical systems and components. It is essential that system testing procedures, cleanliness requirements and safety precautions applicable to the system being maintained are fully observed, understood and complied with. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice is critical.
Evidence of transferability of skills and knowledge related to testing and troubleshooting is essential. This is to be demonstrated through application across a range of aircraft electrical systems and components listed in the Range Statement. The application of testing procedures should clearly indicate knowledge of system operation, the relationship of individual components and the links with other systems (if applicable) within the limits of the aircraft/system fault finding 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 a system and at least one item from each of Groups 1 to 14, including a battery check in the case of Group 14 (Groups 15 to 17 may be omitted where they are not applicable to the enterprise) 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 workplace or simulated workplace using tools and equipment specified in the maintenance manuals. It is also expected that general and special purpose tools, test and ground support equipment would be used where appropriate
Method of assessment
Guidance information for assessment
A person who demonstrates competency in this unit must be able to test and troubleshoot DC and AC electrical systems and components, including looms, cables and connection hardware, while observing 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 testing and troubleshooting applications (including the timely involvement of supervisors or other trades) associated with aircraft electrical systems and components. It is essential that system testing procedures, cleanliness requirements and safety precautions applicable to the system being maintained are fully observed, understood and complied with. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice is critical.
Evidence of transferability of skills and knowledge related to testing and troubleshooting is essential. This is to be demonstrated through application across a range of aircraft electrical systems and components listed in the Range Statement. The application of testing procedures should clearly indicate knowledge of system operation, the relationship of individual components and the links with other systems (if applicable) within the limits of the aircraft/system fault finding 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 a system and at least one item from each of Groups 1 to 14, including a battery check in the case of Group 14 (Groups 15 to 17 may be omitted where they are not applicable to the enterprise) 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 workplace or simulated workplace using tools and equipment specified in the maintenance manuals. It is also expected that general and special purpose tools, test and ground support equipment would be used where appropriate
Method of assessment
Guidance information for assessment
Replaces
| State Code | National Code | Title | Type |
|---|---|---|---|
| W8369 | MEA227B | Test and troubleshoot aircraft electrical systems and components | Unit of competency |
Replaced By
| State Code | National Code | Title | Type |
|---|---|---|---|
| WC006 | MEA227D | Test and troubleshoot aircraft electrical systems and components | Unit of competency |
| State Code | National Code | Title | Type |
|---|---|---|---|
| S753 | MEA50110 | Diploma of Aeroskills (Avionics) | Qualification |
| S754 | MEA50210 | Diploma of Aeroskills (Mechanical) | Qualification |