Application
This unit of competency requires application of hand skills and the use of system/component knowledge and applicable maintenance publications and test equipment to inspect, test, troubleshoot and replace components of light piston engine aircraft pressurisation systems during the performance of scheduled or unscheduled maintenance. Maintenance may be performed individually or as part of a team.
Applications include all types of light fixed wing piston engine aircraft that have cabin pressurisation systems. Where aircraft types have pressurisation and air cycle air conditioning systems the applicable units are MEA208 Remove and install aircraft pressurisation control system components, MEA219 Inspect, test and troubleshoot aircraft pressurisation control systems and components, MEA303 Remove and install aircraft pneumatic system components and MEA310 Inspect, test and troubleshoot aircraft pneumatic systems and components.
The unit is part of the Mechanical Certificate IV (Aircraft Maintenance Stream) training pathway.
Where a Civil Aviation Safety Authority (CASA) licensing outcome is sought this unit forms part of the CASA requirement for the granting of the chosen maintenance certification licence under Civil Aviation Safety Regulation (CASR) Part 66, in accordance with the licensing provisions in the Companion Volume Implementation Guide.
Elements and Performance Criteria
Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. | ||
1. | Inspect light piston engine aircraft pressurisation system | 1.1 | Relevant maintenance documentation and modification status, including system defect reports, where relevant, are used to identify specific inspection requirements |
1.2 | Isolation tags are checked and aircraft configured for safe system inspection and operation in accordance with the applicable maintenance manual | ||
1.3 | Pressurisation 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, including the use of material safety data sheets (MSDS) and items of personal protective equipment (PPE) | ||
1.4 | Defects are correctly identified and reported | ||
2. | Test/adjust light piston engine aircraft pressurisation systems and components | 2.1 | Aircraft and system are prepared in accordance with applicable maintenance manual for the application of power/system operation |
2.2 | Pressurisation system is functionally tested in accordance with maintenance manual for evidence of serviceability or malfunction | ||
2.3 | System adjustment is performed in accordance with maintenance manual | ||
3. | Troubleshoot light piston engine aircraft pressurisation systems | 3.1 | Available information from maintenance documentation, inspection and test results is used, where necessary, to assist in fault determination |
3.2 | Maintenance manual fault diagnosis guides and logic processes are used to ensure efficient and accurate troubleshooting to line replacement level | ||
3.3 | Specialist advice is obtained, where required, to assist with the troubleshooting process | ||
3.4 | Pressurisation system faults are located and the causes of the faults are clearly identified and correctly recorded in maintenance documentation, where required, in accordance with standard enterprise procedures | ||
3.5 | Rectification requirements are determined | ||
4. | Remove and install light piston engine aircraft pressurisation system components | 4.1 | System is rendered safe in accordance with the applicable maintenance manual and isolation tags are fitted, where necessary, to ensure personnel safety |
4.2 | Pressurisation system component removal is carried out in accordance with the applicable maintenance manual while observing all relevant WHS requirements, including the use of MSDS and items of PPE | ||
4.3 | Required maintenance documentation is accurately completed and correctly processed | ||
4.4 | Removed components are tagged, sealed and packaged in accordance with specified procedures | ||
4.5 | Components to be installed are checked to confirm correct part numbers, serviceability and modification status | ||
4.6 | Installation is carried out in accordance with the applicable maintenance manual | ||
4.7 | Required maintenance documentation is completed and processed in accordance with standard enterprise procedures | ||
Evidence of Performance
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:
using hand skills, tools and test equipment in the testing, adjustment and troubleshooting of light piston engine aircraft pressurisation systems and components, including system component removal and installation
recognising pressurisation system and component defects/external damage, correct installation and security for the types of system components listed in the Range of Conditions
performing system functional tests and checks to isolate system faults and assess post-maintenance serviceability
effectively using maintenance documentation and relevant fault diagnosis guides in the troubleshooting process and for component removal and installation
applying standard procedures
observing all relevant WHS procedures including the use of PPE and MSDS.
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 light piston engine aircraft pressurisation systems and components. It is essential that relevant procedures, cleanliness requirements and safety precautions are fully observed, understood and complied with. Ability to interpret inspection procedures and specifications (allowable limits) and apply them in practice is critical.
This shall be demonstrated through application across pressurisation systems and components as listed in the Assessment Conditions.
Evidence of Knowledge
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:
WHS precautions relevant to light piston engine aircraft pressurisation system maintenance and how to obtain PPE and MSDS
physiological aspects relating to high altitude flight:
human oxygen requirements and hypoxia
human temperature requirements and hypothermia
standard trade practices relating to tool and test equipment usage and installation/securing of system components
sources of pressurised air (cabin supercharger, air pump or engine turbocharger)
the relationship between cabin altitude and pressure differential and related structural limitations
pressurisation system:
layout
operation and characteristics
system component operation and construction:
outflow valves
pressure controllers
safety valves
negative pressure relief valves
dump valves
ducting and outlets
electrical and instrument interfaces, including warning and cabin pressure indication systems
interface with heating and air conditioning systems
how to configure the aircraft for inspection, testing and troubleshooting of pressurisation systems and components
pressurisation system maintenance requirements and troubleshooting
component attachment methods
connection hardware and couplings
relevant maintenance manuals
relevant regulatory requirements and standard procedures
maintenance requirements and troubleshooting procedures.
Assessment Conditions
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 applicable general-purpose tools and test equipment found in most routine situations would be used where appropriate.
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.
The following conditions of assessment represent the requirements of the Regulators (ADF and CASA) and maintenance stakeholders and must be rigorously observed.
A person cannot be assessed as competent until it can be demonstrated to the satisfaction of the workplace assessor that the relevant elements and performance criteria of this unit of competency are being achieved under routine supervision on a pressurisation system and on a representative range of the following components:
pressure controllers
outflow valves
safety valves
negative pressure relief valves
ducting.
This shall be established via the records in the Log of Industrial Experience and Achievement or, where appropriate, an equivalent Industry Evidence Guide (for details refer to the Companion Volume Assessment Guidelines).
Assessors must satisfy the requirements of the National Vocational Education and Training Regulator (Australian Skills Quality Authority, or its successors).
Where the unit is to be used for CASA licensing purposes the Assessor must also meet the criteria specified in the CASR Part 147 Manual of Standards.
Foundation Skills
Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.
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. | ||
Pressurisation system components include: | Pressure controllers Outflow valves Safety valves Negative pressure relief valves Ducting | |
Procedures and requirements include: | Industry standard procedures specified by manufacturers, regulatory authorities or the enterprise | |
Sectors
Competency Field
Aviation maintenance