The Evidence Guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Overview of assessment

A person who demonstrates competency in this unit must be able to remove and install the components of aircraft basic 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 8 as listed 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.

Method of assessment

Guidance information for assessment

Individuals being assessed who have already attained MEA275A Maintain basic light aircraft instrument systems and components, will have met all of the criteria for this unit. Log of Industrial Experience and Achievement records relating to MEA275A Maintain basic light aircraft instrument systems and components, may be accepted as also meeting the evidence requirements for this unit.

Required skills

Look for evidence that confirms skills in:

locating and identifying flight instrument system components comprising:

engine system temperature, pressure, speed (including mechanical and electrical tachometers), manifold pressure/boost (including aneroid type, sylphon bellows and dual compartment type)

auxiliary direct reading systems, including hydraulic pressure, pneumatic pressure and vacuum, fuel storage quantities

flight systems, including attitude, altitude, air speed, outside air temperature (OAT)

locating and identifying direct reading compasses.

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

applying relevant OHS practices

Required knowledge

Look for evidence that confirms knowledge of:

component attachment methods

connection of hardware and plugs

handling precautions relating to:

electrostatic sensitive devices

gyroscopes and gimbals

basic instrument system and component operating principles:

atmospherics and barometry

terminology and unit of measurement conversion

aircraft instrumentation requirements

instrument panel layout

pressure sensing elements

pitot static systems and testing requirements

gyroscopic principles

direct reading compasses

temperature sensors

fluid quantity indication systems

general layout and components of the following systems:

flight systems, including:

altitude (direct reading altimeters)

attitude including directional gyros and artificial horizons (both air and electrically driven), turn and slip and turn coordinator

airspeed

OAT

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

auxiliary direct reading systems, including:

electrical

hydraulic pressure

pneumatic pressure and vacuum

basic fuel quantity indication

relevant OHS practices

relevant maintenance manuals

relevant regulatory requirements and standard procedures

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

Note

Range statements listed below are numbered to facilitate specification of the assessment requirements included in the Evidence Guide

Instrument components

Instrument components include:

1. Pitot/static system components, ASIs, VSIs and counter pointer altimeters

2. DGs and AHs, both air and electrically driven

3. Turn and bank and slip/turn coordinators

4. Direct reading compasses

5. Piston engine indication system components (direct reading measuring instruments and temperature indication)

6. Electrical systems indication (voltage, current, power and frequency)

7. Basic fuel quantity indication system components

8. Pneumatic/vacuum indication system components

Application of this unit may relate to:

scheduled or unscheduled maintenance activities

individual or team-related activities

Procedures and requirements

Refer to industry standard procedures specified by manufacturers, regulatory authorities or the enterprise