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Elements and Performance Criteria

1. Inspect instrument systems and components
   • 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 recorded in accordance with standard enterprise procedures

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:	Flight instruments, including pitot/static systems, airspeed indicators (ASIs), vertical speed indicators (VSIs), altimeters, altitude alerting and reporting, turn and bank and slip/turn coordinators, directional gyros (DGs) and artificial horizons (AHs) (air and electrically driven) Machmeters, air data systems, angle of attack, stall warning and avoidance systems Flight data recorders (FDRs) Engine indication systems Magnetic compasses and attitude and heading reference system (AHRS) Miscellaneous instrument systems, including pressure measurement, fuel quantity, fuel flow, position indication, voltage and frequency, current and power Ground proximity warning system (GPWS)
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:

applying relevant WHS practices

using approved maintenance documentation and aircraft publications relating to the instrument system being maintained

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

pitot/static systems and associated instruments and systems

flight instruments

GPWS and FDR

stall warning, angle of attack and stall avoidance systems

navigation systems (compasses and AHRS)

pressure measurement, position indicators, engine/auxiliary system indication systems, including fuel quantity and flow.

It is essential that inspection 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 (including the timely involvement of supervisors or other trades) is critical.

Evidence of transferability of skills and knowledge related to inspection is essential. This is to be demonstrated through application across a range of 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

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

relevant WHS practices

instrument system maintenance requirements

relevant maintenance manuals

relevant regulatory requirements and standard procedures.

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