This unit requires application of hand skills, the use of maintenance publications and knowledge of vapour cycle air conditioning systems to inspect, test and troubleshoot systems, and to remove and install mechanical and electrical system components. Compliance with applicable regulations is required where refrigerant evacuation and recharging is performed.

Applications include all aircraft vapour cycle air conditioning systems and components.

MEA201B

Remove and install miscellaneous aircraft electrical hardware/components

MEA246C

Fabricate and/or repair aircraft electrical components or parts

1. Inspect vapour cycle air conditioning systems

1.1. Isolation tags already attached to the system or related systems are checked and aircraft/engine configured for safe system inspection and operation in accordance with applicable maintenance manual

1.2. Vapour cycle air conditioning systems are visually or physically checked for external and internal signs of defects in accordance with applicable maintenance manual

2. Test vapour cycle air conditioning systems

2.1. Aircraft and system are correctly prepared in accordance with applicable maintenance manual

2.2. Vapour cycle air conditioning system is tested in accordance with prescribed test procedures to establish serviceability and correct function in accordance with applicable maintenance manual

3. Troubleshoot vapour cycle air conditioning systems

3.1. Available information from maintenance documentation and inspection and test results is used, where necessary, to assist in fault determination

3.2. Maintenance manual fault diagnosis guide and logical processes are used to ensure efficient and accurate troubleshooting

3.3. Specialist advice is obtained, where required, to assist with the troubleshooting process

3.4. Vapour cycle air conditioning system faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required

3.5. Fault rectification requirements are determined to assist in planning the repair

4. Remove vapour cycle air conditioning system components

4.1. Aircraft and vapour cycle air conditioning system is rendered safe in accordance with the applicable maintenance manual and isolation tags are fitted, where necessary, to ensure the safety of personnel and freedom from damage during component removal

4.2. Where refrigerant evacuation is necessary, evacuation is performed in accordance with regulatory requirements and maintenance manual procedures

4.3. Component removal is carried out in accordance with the applicable maintenance manual

4.4. Component is tagged and prepared for transport or storage in accordance with the specified procedures

4.5. Required maintenance documentation is completed and processed in accordance with standard enterprise procedures

5. Install vapour cycle air conditioning system components

5.1. Component to be installed is checked to confirm correct part or model numbers, modification status and serviceability

5.2. Installation is carried out in accordance with the applicable maintenance manual

5.3. Vapour cycle air conditioning system is recharged with refrigerant, where necessary, in accordance with maintenance manual procedures and regulatory requirements

5.4. Vapour cycle air conditioning system is tested for correct function and freedom from refrigerant leaks if system recharging has been performed

5.5. Required maintenance documentation is completed and processed in accordance with standard enterprise procedures

Required skills

Look for evidence that confirms skills in:

applying relevant OHS procedures, including the selection and use of applicable MSDS and PPE

complying with regulatory requirements regarding the de-gassing of vapour cycle air conditioning systems

using relevant maintenance documentation and aircraft manuals

recognising external and internal signs of defects in vapour cycle air conditioning systems and system components through visual/physical inspection

testing of vapour cycle air conditioning system operation, be able to operate systems and leak testing equipment, monitor indications and recognise correct function

using specialist equipment to evacuate and recharge refrigerant

using fault diagnosis guides and equivalent data to accurately and efficiently troubleshoot the causes of unserviceabilities in vapour cycle air conditioning systems, clearly recording details and identifying the required rectification actions

correctly removing and installing vapour cycle air conditioning system electrical and mechanical components

Required knowledge

Look for evidence that confirms knowledge of:

OHS procedures associated with vapour cycle air conditioning system maintenance, including the selection and use of PPE

how to obtain applicable MSDS

regulations applying to the evacuation and recharging of refrigerant

fault diagnosis techniques

vapour cycle air conditioning system layout and operation

vapour cycle air conditioning system electrical and mechanical component operation:

compressor

condenser

receiver dryer

thermal expansion valve

evaporator

magnetic clutch and drive system:

belt

power takeoff

electric motor

hydraulic motor

pneumatic

condenser extension and retraction system

blower

throttle system shutoff

temperature control system

refrigerant used in aircraft vapour cycle air conditioning systems

lubricants used in compressors

equipment used to test systems and evacuate and recharge refrigerant

procedures for evacuating and recharging system refrigerant

refrigerant leak testing techniques and equipment

removal and installation procedures for vapour cycle air conditioning system components

vapour cycle air conditioning system maintenance requirements

relevant maintenance manuals

relevant regulatory requirements and standard procedures

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 apply hand skills, use maintenance publications and engine and system theory knowledge to inspect, test and troubleshoot vapour cycle air conditioning systems and to remove and install system components while applying all relevant safety precautions.

Critical aspects for assessment and evidence required to demonstrate competency in this unit

The underlying skills inherent in this unit should be transferable across a range of inspection, testing, troubleshooting and removal and installation tasks (including the timely involvement of supervisor or other trades) associated with vapour cycle air conditioning systems and components. It is essential that system testing procedures take into account all safety precautions associated with vapour cycle air conditioning system operation and testing, and that regulations relating to the evacuation and recharging of refrigerant be strictly observed.

Evidence of transferability of skills and knowledge related to inspection, testing and troubleshooting is essential. This may be demonstrated through application across a number of aircraft vapour cycle air conditioning systems. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice is critical. The application of testing procedures and functional checks should also indicate knowledge of system operation and regulations relating to refrigerant. Vapour cycle air conditioning system operation knowledge, the relationship of individual components and the links with other systems will be necessary to supplement evidence of ability to carry out engine control system checks and troubleshoot the system within the limits of the aircraft/system fault-finding guide 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 a system and a representative range of components in Groups 1 to 6 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 work environment or simulated work environment using tools and equipment specified in maintenance documentation. It is also expected that general purpose tools and test equipment found in most routine situations would be used where appropriate.

Method of assessment

Guidance information for assessment

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

Vapour cycle air conditioning systems

Vapour cycle air conditioning systems may include:

1. Refrigeration system compressor, condenser, receiver dryer, thermal expansion valve and evaporator

2. Magnetic clutch and drive system (belt, power takeoff, electric motor, hydraulic motor or pneumatic as applicable)

3. Condenser extension and retraction system

4. Blower

5. Throttle system shutoff

6. Temperature control system

Troubleshooting

Troubleshooting involves the use of test sets, maintenance data and fault-finding charts or similar, to line replacement level

Application of this unit may relate to:

scheduled or unscheduled maintenance

individual or team-related activities

Procedures and requirements

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

This unit contains employability skills.