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Elements and Performance Criteria

1. Inspect basic aircraft 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 while observing all relevant work health and safety (WHS) requirements
   • Instrument system components are visually or physically checked for external signs of defects in accordance with applicable maintenance manual
   • Defects are correctly identified and reported
2. Test/adjust basic aircraft 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 basic aircraft 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
4. Remove and install basic aircraft instrument system components
   • System is rendered safe and prepared in accordance with the applicable maintenance manual and isolation tags are fitted where necessary to ensure personnel safety
   • Instrument component removal is carried out in accordance with the applicable maintenance manual while observing all relevant WHS requirements
   • Required maintenance documentation is completed and processed in accordance with standard enterprise procedures
   • Removed components are tagged and packaged in accordance with specified procedures
   • Instrument components to be installed are checked to confirm correct part numbers, modification status, serviceability and shelf life
   • Physical installation of instrument components is performed in accordance with the applicable maintenance manual and regulatory requirements, ensuring appropriate adjustment/alignment is carried out
   • System is reinstated to correct operational condition in preparation for testing, as necessary

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.
Applicable instrument systems and components include:	Pitot/static systems and components, airspeed indicators (ASI), vertical speed indicators (VSI), 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 Piston engine and gas turbine engine indication system components (direct reading measuring instruments and temperature indication) Electrical systems indication (voltage and current) Basic fuel quantity indication systems and components Vacuum indication components Electronic flight and engine instruments (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:

using approved maintenance documentation and aircraft publications relating to basic instrument systems

locating and identifying flight instrument system components comprising:

engine system temperature and speed, including mechanical and electrical tachometers

auxiliary direct reading systems, including vacuum, fuel storage quantities

flight systems, including attitude, altitude, air speed and OAT

locating and identifying direct reading compasses

correct handling and observance of maintenance precautions relating to gyroscopes, gimbals and pitot/static systems (connections, heating and protrusions)

recognising 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

piston engine and gas turbine engine indication systems

electrical systems indication

basic fuel quantity indication systems

vacuum indication systems

applying logic processes, taking and interpreting system measurements, using test equipment and appropriate wiring diagrams and manuals to isolate 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.

Where relevant to the enterprise:

locating and identifying:

electronic flight instrument system (EFIS)

engine indicating and crew alerting system (EICAS)

electronic central aircraft monitoring (ECAM)

data linkage and transmission systems

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

interpreting the information presented on instrument display systems

performing system functional tests and checks to confirm post-maintenance serviceability

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:

component attachment methods

connection of hardware and plugs

handling precautions for electrostatic sensitive devices

relevant WHS practices

the basic layout (block diagram level), function and operation of the following systems as listed in the Range of Conditions:

pitot/static systems

piston engine and gas turbine engine direct reading indication systems

basic fuel quantity measurement systems

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

instrument construction and operation:

instrument groupings, panel layout and construction

pitot static instruments (ASI, VSI and counter-pointer altimeters), their operation, calibration, safe handling and related terminology

pitot pressure

static pressure

altimeter Q code settings:

QNH

QNE

QFE

indicated airspeed (IAS)

true airspeed (TAS)

vacuum system indication component construction and operation

air and electrically powered artificial horizon construction and operation

DG construction and operation

construction and operation of direct reading engine instruments

turn and bank and slip/turn coordinator construction and operation

direct reading compass construction and compass calibration

piston and gas turbine engine direct reading measuring instruments and temperature indication instruments construction and operation

voltage and current measuring instrument construction and operation

volumetric fluid quantity system components, construction and operation

instrument system maintenance requirements and troubleshooting procedures, including pitot/static system leak testing

relevant maintenance documentation and maintenance publications

relevant regulatory requirements and standard procedures

for electronic flight and engine instrument systems:

the layout and operation (to block diagram level) of EFIS, EICAS and ECAM systems and related data linkage and transmission systems

interpretation of display data

component removal and installation procedures

testing of system operation using on-board testing procedures and/or simple external test equipment with a go or no go outcome

software management control requirements.

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