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Elements and Performance Criteria

1. Inspect aircraft advanced instrument 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
   • Instrument system components are visually or physically checked for external signs of defects in accordance with applicable maintenance manual while observing all relevant work health and safety (WHS) requirements
   • Defects are correctly identified and reported
2. Test/adjust aircraft advanced instrument systems and components
   • Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation
   • Instrument 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 aircraft advanced instrument systems
   • Available information from maintenance documentation, 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
   • Instrument system faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required, in accordance with standard enterprise procedures
   • Rectification requirements are determined

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.
Instrument systems and components include:	Pitot/static system components; airspeed indicators (ASIs); vertical speed indicators (VSIs); air data systems and components; machmeters; altimeters, including servo and encoding altimeters; angle of attack and stall warning/avoidance systems Turn and slip indicators, directional gyros (DGs), artificial horizons (AHs), attitude and heading reference systems (AHRS) and components, remote reading gyro compass systems and components and direct reading compasses Turbine engine indication systems and components (tachometers, pressure, temperature, engine performance and engine vibration) Transmitter/indicator measuring instrument systems (pressure, temperature and position) Fuel quantity indication and flow systems and components Ground proximity warning system (GPWS) (where applicable to the enterprise) Flight data recorders (FDRs) (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:

recognition of system and component defects/external damage, correct installation, connection of plugs, terminations, attaching hardware (including cabling/harnesses) and security in:

flight instruments

pitot/static systems

navigation systems – compasses and AHRS

GPWS (where applicable to the enterprise)

FDRs (where applicable to the enterprise)

position indicators, engine/auxiliary system indication systems and system components

applying logic processes, taking and interpreting system measurements, and using test equipment and appropriate wiring diagrams and manuals to isolate instrument and display system malfunctions in the listed systems

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

applying relevant WHS practices

using approved maintenance documentation and aircraft publications relating to the instrument and display systems being maintained.

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

component attachment methods

connection of hardware

instrument system maintenance requirements and testing and troubleshooting procedures

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

flight instruments, including:

ASIs

VSIs

air data systems and components

machmeters

altimeters including servo and encoding altimeters

turn and slip indicators

AHs

DGs

angle of attack and stall warning/avoidance systems

pitot/static systems

navigation systems:

direct reading compasses

gyro compasses

AHRS

GPWS

turbine engine instruments, including:

temperature and pressure, including thermocouples, sensors and transmitters

speed, including mechanical and electric tachometers

thrust, including fan, propeller and jet

torque

fuel flow

vibration

auxiliary transmitter/indicator measuring systems, including:

hydraulic pressure and temperature

pneumatic pressure

transmission oil pressure and temperature

fuel remaining/used

fuel quantity indication

component position (e.g. doors, flaps, speed brakes and landing gear)

FDR systems

explaining the operating principles of the above-listed systems and associated with:

atmospheric conditions; properties and effects on aircraft instruments and systems

pressure and temperature sensing elements and their use in aircraft instruments

gyroscopes and their use in aircraft instrument and reference systems

explaining the various methods of navigation, and describing how they are used by both aircraft conventional and electronic navigational instruments and systems

relevant WHS practices

relevant maintenance manuals

relevant regulatory requirements and standard procedures.

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