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Evidence Guide: MEA274A - Maintain basic light aircraft electrical systems and components

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

MEA274A - Maintain basic light aircraft electrical systems and components

What evidence can you provide to prove your understanding of each of the following citeria?

Inspect basic aircraft electrical systems and components

  1. Relevant maintenance documentation and modification status, including system defect reports, where relevant, are used to identify specific inspection requirements
  2. Isolation tags are checked and aircraft configured for safe system inspection and operation in accordance with the applicable maintenance manual
  3. DC electrical system is visually or physically checked for external signs of defects in accordance with applicable maintenance manual
  4. Defects are correctly identified and reported
Relevant maintenance documentation and modification status, including system defect reports, where relevant, are used to identify specific inspection requirements

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Isolation tags are checked and aircraft configured for safe system inspection and operation in accordance with the applicable maintenance manual

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

DC electrical system is visually or physically checked for external signs of defects in accordance with applicable maintenance manual

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Defects are correctly identified and reported

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Test/adjust basic aircraft electrical systems

  1. Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation
  2. Electrical system is functionally tested, in accordance with maintenance manual, for evidence of serviceability or malfunction
  3. System calibration or adjustments are performed in accordance with maintenance manual, as appropriate
Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Electrical system is functionally tested, in accordance with maintenance manual, for evidence of serviceability or malfunction

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

System calibration or adjustments are performed in accordance with maintenance manual, as appropriate

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Troubleshoot basic aircraft electrical systems

  1. Available information from maintenance documentation and inspection and test results is used, where necessary, to assist in fault determination
  2. Maintenance manual fault diagnosis guides and logic processes are used to ensure efficient and accurate troubleshooting
  3. Specialist advice is obtained, where required, to assist with the troubleshooting process
  4. System faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required, and in accordance with standard enterprise procedures
  5. Rectification requirements are determined
Available information from maintenance documentation and inspection and test results is used, where necessary, to assist in fault determination

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Maintenance manual fault diagnosis guides and logic processes are used to ensure efficient and accurate troubleshooting

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

System faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required, and in accordance with standard enterprise procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Rectification requirements are determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Remove and install basic aircraft electrical system components

  1. System is rendered safe and prepared in accordance with the applicable maintenance manual and isolation tags are fitted where necessary to ensure personnel safety
  2. Electrical component removal is carried out in accordance with the applicable maintenance manual
  3. Required maintenance documentation is completed and processed in accordance with standard enterprise procedures
  4. Removed components are tagged and packaged in accordance with specified procedures
  5. Electrical components to be installed are checked to confirm correct part numbers, modification status, serviceability and shelf life
  6. Physical installation of electrical components is performed in accordance with the applicable maintenance manual, ensuring appropriate adjustment/alignment with mechanical interface is carried out
  7. System is reinstated to correct operational condition in preparation for testing, as necessary
System is rendered safe and prepared in accordance with the applicable maintenance manual and isolation tags are fitted where necessary to ensure personnel safety

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Electrical component removal is carried out in accordance with the applicable maintenance manual

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Removed components are tagged and packaged in accordance with specified procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Electrical components to be installed are checked to confirm correct part numbers, modification status, serviceability and shelf life

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Physical installation of electrical components is performed in accordance with the applicable maintenance manual, ensuring appropriate adjustment/alignment with mechanical interface is carried out

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

System is reinstated to correct operational condition in preparation for testing, as necessary

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

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 inspect, test and troubleshoot basic DC electrical systems and remove and install components, including looms, cables and connection hardware, while observing 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 and troubleshooting applications (including the timely involvement of supervisors or other trades) associated with basic aircraft DC electrical systems and components. It is essential that system testing procedures, 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. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice is critical.

Evidence of transferability of skills and knowledge related to inspection, testing and troubleshooting and component removal and installation is essential. This is to be demonstrated through application across a range of aircraft electrical systems and components listed in the Range Statement. The application of testing procedures should clearly indicate knowledge of system operation, the relationship of individual components and the links with other systems (if applicable) 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 electrical looms, cables and connection hardware, and on each system in Range Statement Groups 1 to 4 and on at least one major component/LRU in each case. For Group 5, competency may be demonstrated through the performance of a battery check. Component removal and installation competencies are to be demonstrated on at least one component from each of groups 6 to 11. 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

Required Skills and Knowledge

Required skills

Look for evidence that confirms skills in:

applying relevant OHS practices, including those relating to gas turbine engine high energy ignition units

using approved maintenance documentation and aircraft publications relating to DC electrical systems

identifying/locating:

DC power generation, regulation, distribution and control systems and components:

generators and starter/generators

regulators

bus bars

circuit breakers and fuses

wiring

piston engine ignition and starting systems and components:

magnetos or coils

starter motors

ignition switches/start switches

ignition harnesses

low tension wiring

spark plugs

auxiliary starting devices

gas turbine engine ignition and starting systems:

starter motors and starter/generators

high energy ignition units

control units

switches

batteries and associated mounting equipment, including related anti-vibration aids

motors and actuators in basic DC electrical systems

correctly connecting DC generators, alternator/rectifier generators and starter/generators

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

DC power generation systems including regulation, distribution and control

battery installations

piston engine ignition and starting systems

gas turbine engine ignition and starting systems (where applicable to the enterprise)

internal/external lighting systems, including controls

motors and actuators in basic DC electrical systems

applying logic processes, taking and interpreting electrical 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

Required knowledge

Look for evidence that confirms knowledge of:

component attachment methods

connection of hardware and plugs

DC electrical principles:

properties of permanent magnets

precautions for the care and storage of permanent magnets

properties of electromagnets

primary and secondary cells

aircraft battery types, construction, care and safety

resistor characteristics

fuses and circuit breakers

fundamental DC circuits

inductive circuits

capacitive circuits

basic fault-finding principles

general construction, operating characteristics and applications for aircraft:

DC generators

alternator/rectifier generators

DC motors including starter motors

starter/generators

DC actuators (linear and rotary)

gas turbine high energy ignition system components and related safety precautions

lighting systems

the basic layout (block diagram level), function and operation of the systems listed in the Range Statement

electrical system maintenance requirements and troubleshooting procedures

relevant OHS practices, including those relating to gas turbine engine high energy ignition units

relevant maintenance manuals

relevant regulatory requirements and standard procedures

Range Statement

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

Applicable electrical systems

Electrical systems may include:

1. DC power generation, regulation and distribution systems

2. Piston engine and gas turbine engine ignition and starting systems (as applicable to the enterprise)

3. DC electrical systems, such as flaps, including related motors and actuators

4. Aircraft lighting

5. Aircraft main battery

Troubleshooting

Troubleshooting involves the use of fault-finding charts or similar, to line replacement level

Applicable electrical components

Electrical components include:

6. DC generators, and alternator/rectifier generators, and components of related single generator regulation and distribution systems

7. Motors

8. Actuators

9. Piston engine ignition and starting system components

10. Aircraft batteries

11. Aircraft lighting components, such as bulbs, lenses, switches and rheostats

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