Unit of competency Outline
Date retreived
22/07/2026 5:50 AM AWST
22/07/2026 5:50 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 instrument systems and components
Test and troubleshoot aircraft instrument systems and components
Unit of competency
National Code
MEA228C
MEA228C
State Code
D4442
D4442
TGA Status
Replaced
Replaced
DTWD Status
Replaced
Replaced
State Implementation and Classification
Approved Date
04/05/2011
Field of Education
031503 - Aircraft Maintenance Engineering
Original Release Date
04/05/2011
Nominal Hours
150
Description
This unit is part of the Avionic AME Certificate IV training pathways. It covers the competencies required to test and troubleshoot aircraft instrument and display systems and components. Where a CASA licensing outcome is sought this unit forms part of the CASA requirement for the granting of 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/ service difficulty reports where relevant, are interpreted to identify an unserviceability.
2. Test/adjust instrument and display systems.
- 2.1. The aircraft and systems are correctly prepared, in accordance with specified procedures, for the application of power and system operation.
- 2.2. Instrument or display system is functionally tested, in accordance with specified procedures, for evidence of serviceability or malfunction.
- 2.3. System calibration or adjustments are performed in accordance with specified procedures.
3. Troubleshoot instrument and display 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. Instrument or display system faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required.
- 3.5. Fault rectification requirements are determined to assist in planning the repair or adjustment.
Note
Range statements listed below are numbered to facilitate specification of the assessment requirements included in the Evidence Guide.
1. Flight instruments - pitot/static systems, airspeed indicators (ASIs) machmeters, air data systems and instruments, vertical speed indicators (VSIs), altimeters, altitude alerting and reporting, turn and bank, directional gyros (DGs), artificial horizons (AHs), angle of attack, stall warning/avoidance, ground proximity warning system (GPWS), flight data recorders (FDRs
2. Engine Instruments - engine speed, pressure, temperature, performance, vibration, torque
3. Instrument navigation systems - inertial navigation systems (INS), inertial reference systems, compasses, attitude heading reference system (AHRS)
4. Miscellaneous - pressure, fuel quantity, fuel flow, position, voltage, frequency, current, power
5. Display systems - electronic flight instrument systems (EFIS), engine indicating and crew alerting systems (EICAS), flight management computer systems (FMCS), electronic centralised aircraft monitor (ECAM), head-up display (HUD)
6. Integrated modular avionics
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. Flight instruments - pitot/static systems, airspeed indicators (ASIs) machmeters, air data systems and instruments, vertical speed indicators (VSIs), altimeters, altitude alerting and reporting, turn and bank, directional gyros (DGs), artificial horizons (AHs), angle of attack, stall warning/avoidance, ground proximity warning system (GPWS), flight data recorders (FDRs
2. Engine Instruments - engine speed, pressure, temperature, performance, vibration, torque
3. Instrument navigation systems - inertial navigation systems (INS), inertial reference systems, compasses, attitude heading reference system (AHRS)
4. Miscellaneous - pressure, fuel quantity, fuel flow, position, voltage, frequency, current, power
5. Display systems - electronic flight instrument systems (EFIS), engine indicating and crew alerting systems (EICAS), flight management computer systems (FMCS), electronic centralised aircraft monitor (ECAM), head-up display (HUD)
6. Integrated modular avionics
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 a range of instrument and display systems and components that is representative of the scope of the listed variables in accordance with relevant maintenance manual instructions while applying all relevant OHS procedures and standard processes. Coverage of display systems is required only where applicable to the enterprise.
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 inspection, testing and troubleshooting applications (including the timely involvement of supervisors or other trades) associated with aircraft instrument and display systems and their 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 inspection, testing and troubleshooting is essential. This may be demonstrated through application across a range of aircraft instrument and display systems (where display systems are applicable to the enterprise) 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 this Unit of Competency are being achieved under routine supervision on a system and on at least one major system component of each Group 1 to 6 (Groups 5 and 6 may be omitted if not applicable to the enterprise), as listed 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 work environment or simulated work environment, using procedures, tools and equipment specified in maintenance documentation. It is also expected that general purpose tools, test and ground support equipment found in most routine situations would be used where appropriate. The level of troubleshooting is limited in its application to the use of fault diagnosis guides or other similar information to enable troubleshooting to line replaceable item level
Method of assessment
Guidance information for assessment
A person who demonstrates competency in this unit must be able to test and troubleshoot a range of instrument and display systems and components that is representative of the scope of the listed variables in accordance with relevant maintenance manual instructions while applying all relevant OHS procedures and standard processes. Coverage of display systems is required only where applicable to the enterprise.
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 inspection, testing and troubleshooting applications (including the timely involvement of supervisors or other trades) associated with aircraft instrument and display systems and their 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 inspection, testing and troubleshooting is essential. This may be demonstrated through application across a range of aircraft instrument and display systems (where display systems are applicable to the enterprise) 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 this Unit of Competency are being achieved under routine supervision on a system and on at least one major system component of each Group 1 to 6 (Groups 5 and 6 may be omitted if not applicable to the enterprise), as listed 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 work environment or simulated work environment, using procedures, tools and equipment specified in maintenance documentation. It is also expected that general purpose tools, test and ground support equipment found in most routine situations would be used where appropriate. The level of troubleshooting is limited in its application to the use of fault diagnosis guides or other similar information to enable troubleshooting to line replaceable item level
Method of assessment
Guidance information for assessment
Replaces
| State Code | National Code | Title | Type |
|---|---|---|---|
| W8370 | MEA228B | Test and troubleshoot aircraft instrument systems and components | Unit of competency |
Replaced By
| State Code | National Code | Title | Type |
|---|---|---|---|
| WC021 | MEA228D | Test and troubleshoot aircraft instrument systems and components | Unit of competency |
| State Code | National Code | Title | Type |
|---|---|---|---|
| S753 | MEA50110 | Diploma of Aeroskills (Avionics) | Qualification |