Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners

MEA277A Mapping and Delivery Guide
Maintain twin engine aircraft electrical systems and components

Version 1.0
Issue Date: May 2024


Qualification -
Unit of Competency MEA277A - Maintain twin engine aircraft electrical systems and components
Description This unit of competency is part of the Avionic Certificate IV AME training pathway. It covers the competencies additional to those of MEA202B Remove and install basic aircraft electrical system components and MEA210B Inspect, test and troubleshoot basic aircraft electrical systems and components that are required for the maintenance of the electrical systems of twin piston engine aircraft. Where a CASA licensing outcome is sought this unit forms part of the CASA requirement for the granting of the applicable Aircraft Maintenance Engineer Licence under CASR Part 66, in accordance with the licensing provisions in Section 3, Assessment Guidelines.
Employability Skills This unit contains employability skills.
Learning Outcomes and Application This unit extends the competencies developed in units MEA202B Remove and install basic aircraft electrical system components and MEA210C Inspect, test and troubleshoot basic aircraft electrical systems and components to include the maintenance of additional electrical systems found in twin engine aircraft.Applications include twin piston engine fixed wing aircraft.
Duration and Setting X weeks, nominally xx hours, delivered in a classroom/online/blended learning setting.
Prerequisites/co-requisites MEA210C Inspect, test and troubleshoot basic aircraft electrical systems and components
Competency Field Aviation maintenance
Development and validation strategy and guide for assessors and learners Student Learning Resources Handouts
Activities 		Slides
PPT 		Assessment 1 Assessment 2 Assessment 3 Assessment 4
Elements of Competency Performance Criteria              
Element: Inspect twin engine aircraft electrical 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
  • DC electrical system is visually or physically checked for external signs of defects in accordance with applicable maintenance manual
  • Defects are correctly identified and reported
       
Element: Test/adjust twin engine aircraft electrical systems
  • Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation
  • Electrical 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
       
Element: Troubleshoot twin engine aircraft electrical systems
  • Available information from maintenance documentation and 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
  • Specialist advice is obtained, where required, to assist with the troubleshooting process
  • 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
  • Rectification requirements are determined
       
Element: Remove and install twin engine aircraft electrical 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
  • Electrical component removal is carried out in accordance with the applicable maintenance manual
  • Required maintenance documentation is completed and processed in accordance with standard enterprise procedures
  • Removed components are tagged and packaged in accordance with specified procedures
  • Electrical components to be installed are checked to confirm correct part numbers, modification status, serviceability and shelf life
  • Physical installation of electrical components is performed in accordance with the applicable maintenance manual, ensuring appropriate adjustment/alignment with mechanical interface is carried out
  • System is reinstated to correct operational condition in preparation for testing, as necessary
       


Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

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 the DC electrical systems and components of twin piston engine aircraft 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 twin piston engine 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 8 and on at least one major component/line replacement unit (LRU) in each case (Groups 2, 4, 5 and/or 8 may be omitted if they are not applicable to the enterprise). For Group 3, 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 9 to 16 (Groups 10, 12, 13 and/or 16 may be omitted if they are not applicable to the enterprise). This shall be established via the records in the Log of Industrial Experience and Achievement or, where appropriate, an equivalent Industry .

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

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assignment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

Required skills

Look for evidence that confirms skills in:

applying relevant occupational health and safety (OHS) practices

using approved maintenance documentation and aircraft publications relating to twin engine aircraft electrical systems

identifying/locating:

DC multi-generator power generation, regulation, distribution and control systems and components, i.e. regulators and bus bars

electrical propeller control systems and components, such as feathering and synchronising systems

batteries in dual battery installations and associated mounting equipment, including related anti-vibration aids

fire warning and extinguishing systems and components

identification of halogen (e.g. BCF) fire extinguishers

combustion heating systems

equipment cooling and ventilation

fuel storage and distribution system electrical components

master and central warning systems

correctly connecting DC generators and alternator/rectifier generators in multi-generator systems and paralleling generator output

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

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:

system testing procedures and paralleling of generator output

the basic layout (block diagram level), function and operation of:

DC multi-generator and alternator/rectifier generator regulation and distribution systems and components

electrical propeller control systems, such as feathering and synchronising systems and system components

dual battery systems and associated mounting equipment, including related anti-vibration aids

fire warning and extinguishing systems and system components, including regulatory requirements relating to halogen (e.g. BCF) fire extinguishers

combustion heating systems and system components

equipment cooling and ventilation systems and system components

fuel storage and distribution systems and system components

master and central warning systems and system components

maintenance requirements and troubleshooting procedures for the above electrical systems

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

DC electrical systems

DC electrical systems may include:

1. DC multi-generator and alternator/rectifier generator regulation and distribution systems and components

2. Electrical propeller control systems, such as feathering systems (where applicable to the enterprise)

3. Batteries in dual battery installations and associated mounting equipment, including related anti-vibration aids

4. Fire warning and extinguishing systems, including handling of halogen fire extinguishers (where applicable to the enterprise)

5. Combustion heating systems (where applicable to enterprise)

6. Equipment cooling and ventilation

7. Fuel storage and distribution systems

8. Master and central warning systems (where applicable to enterprise)

Troubleshooting

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

Electrical components

Electrical components include:

9. Components of multi-generator regulation and distribution systems

10. Electrical propeller control system components (where applicable to the enterprise)

11. Batteries in dual battery installations and associated mounting equipment, including related anti-vibration aids

12. Fire warning and extinguishing system components (where applicable to the enterprise)

13. Combustion heaters and associated components (where applicable to enterprise)

14. Equipment cooling and ventilation components

15. Fuel storage and distribution system electrical components

16. Master and central warning system components (where applicable to enterprise)

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

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
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 
DC electrical system is visually or physically checked for external signs of defects in accordance with applicable maintenance manual 
Defects are correctly identified and reported 
Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation 
Electrical 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 
Available information from maintenance documentation and 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 
Specialist advice is obtained, where required, to assist with the troubleshooting process 
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 
Rectification requirements are determined 
System is rendered safe and prepared in accordance with the applicable maintenance manual and isolation tags are fitted where necessary to ensure personnel safety 
Electrical component removal is carried out in accordance with the applicable maintenance manual 
Required maintenance documentation is completed and processed in accordance with standard enterprise procedures 
Removed components are tagged and packaged in accordance with specified procedures 
Electrical components to be installed are checked to confirm correct part numbers, modification status, serviceability and shelf life 
Physical installation of electrical components is performed in accordance with the applicable maintenance manual, ensuring appropriate adjustment/alignment with mechanical interface is carried out 
System is reinstated to correct operational condition in preparation for testing, as necessary 

Forms

Assessment Cover Sheet

MEA277A - Maintain twin engine aircraft electrical systems and components
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

Feedback to student

 

 

 

 

 

 

 

 

Assessor name:

Signature:

Date:

Assessment Record Sheet

MEA277A - Maintain twin engine aircraft electrical systems and components

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

Date: