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Elements and Performance Criteria

1. Inspect aircraft basic 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 basic 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 basic instrument systems and components
   • 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 systems and components, airspeed indicators (ASIs), vertical speed indicators (VSIs), outside air temperature gauges (OAT) and counter-pointer altimeters Directional gyros (DGs) and artificial horizons (AHs) (air and electrically driven) Turn and bank and slip/turn coordinators Direct reading compasses Remote reading gyro compass systems (where applicable to the enterprise) Piston engine indication system components (direct reading measuring instruments and temperature indication) Gas turbine engine indication system components (where applicable to the enterprise) Electrical systems indication (voltage, current, power and frequency) Basic fuel quantity indication systems and components Pneumatic/vacuum indication components
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

direct reading compasses

remote reading gyro compass systems (may be omitted if not relevant to the enterprise)

piston engine indication systems

gas turbine engine indication systems (may be omitted if not relevant to the enterprise)

electrical systems indication

basic fuel quantity indication systems

pneumatic/vacuum indication systems

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

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

applying WHS requirements relevant to instrument system maintenance.

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 basic 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:

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

flight systems, including:

altitude (direct reading altimeters)

attitude including DGs and AHs (both air and electrically driven), turn and slip and turn coordinator

airspeed

OAT

remote reading gyro compass systems

piston engine indication systems, including:

direct reading temperature

direct reading pressure (e.g. oil pressure)

speed, including mechanical and electric tachometers

manifold pressure/boost, including aneroid, sylphon bellows and dual compartment types

gas turbine engine indication systems, including:

temperature and pressure

speed, including mechanical and electric tachometers

torque

fuel flow

vibration

auxiliary direct reading systems, including:

electrical

hydraulic pressure

pneumatic pressure and vacuum

basic fuel quantity indication

basic instrument system maintenance and testing requirements, and troubleshooting procedures

WHS requirements relevant to instrument system maintenance

the operating principles of the above 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 systems

electrical fundamentals

direct reading compass installations and calibration

calibration of remote reading gyro compass systems

relevant maintenance manuals

relevant regulatory requirements and standard procedures.

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