Elements and Performance Criteria

Application of this unit may relate to:
Scheduled or unscheduled maintenance
Individual or team related activities
Procedures and requirements refer to industry standard procedures specified by manufacturers, regulatory authorities or the enterprise.



1. Pitot/static system components, Airspeed Indicators (ASIs), Vertical Speed Indicators (VSIs), air data system components, machmeters, altimeters including servo and encoding altimeters, angle of attack and stall warning/avoidance systems

2. Turn and slip, Directional Gyros (DGs), Artificial Horizons (AHs), Attitude Heading Reference System (AHRS) components (where applicable to enterprise), remote reading gyro compass system components and direct reading compasses

3. Turbine engine indication systems

4. Transmitter/indicator measuring instrument systems (pressure, temperature, position)

5. Fuel quantity indication and flow systems components

6. Ground Proximity Warning System (GPWS)

7. Flight Data Recorders (FDRs).

Overview of assessment
A person who demonstrates competency in this unit must be able to remove and install the components of aircraft basic and advanced instrument systems while observing all relevant safety and component handling precautions.

Critical aspects for assessment and evidence required to demonstrate competency in this unit
It is essential that cleanliness requirements and safety precautions applicable to the system being maintained are fully observed, understood and complied with, as well as work practices associated with electrostatic sensitive devices.
Evidence of transferability of skills and knowledge related to removal and installation is essential. This is to be demonstrated by application across a range of aircraft instrument system components as listed in the Range Statement. An understanding of the attachment methods, connection of hardware, and the need for adjustment or calibration and system operation as they relate to the work must be demonstrated 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 at least one component from each of Groups 1 to 7 (Groups 6 and 7 may be omitted where 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 maintenance manuals. It is also expected that general-purpose tools, test and ground support equipment found in most routine situations would be used where appropriate.