7232 Aircraft engine mechanics and fitters  

101410 Inspect gas turbine engine systems and components

(ก) ความต้องการด้านทักษะ

See Appendix A

(ข) ความต้องการด้านความรู้

See Appendix A

(a) Performance Evidence

      Evidence required to express competency in this unit must be related to and fulfil all of the requirements of the elements and performance criteria under the indicated conditions of assessment, and must include:

•    Applying relevant WHS procedures, including lifting and handling of heavy components.

•    Using MSDS and PPE.

•    Using relevant maintenance documentation and aircraft manuals to:

•  Recognise through visual/physical inspection external and internal signs of defects in gas turbine engines, components and system components.

•  Assist with testing of gas turbine engine and engine system operation, be able to operate systems, monitor indications, record parameters and recognise correct function.

•  Compile engine condition monitoring records.

•  Rig and adjust engine controls and systems.

•  Using fault diagnosis guides and equivalent data, to accurately and efficiently troubleshoot the causes of unserviceability in gas turbine engines and engine systems, clearly record details and identify the required rectification actions.

    The fundamental skills inherent in this unit should be transferable across a range of inspection, testing and troubleshooting tasks (including the timely involvement of supervisors or other trades) associated with engine systems. It is crucial that that system test procedures consider all safety precautions associated with gas turbine engine system operation, especially with regard to high-energy ignition units, and that awareness be demonstrated of dual inspection requirements associated with work on engine control systems.

    It is essential to be able to interpret inspection procedures and specifications (allowable limits) and apply them in practice. This shall be demonstrated through application across a range of engine systems as specified in the Assessment Conditions.

(b) Knowledge Evidence

      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:

•  Fault diagnosis techniques.

•  Gas turbine engine layout and operation:

•  Types of gas turbine.

•  Operating principles and power output.

•  Gas path.

•  Intakes.

•  Compressors.

•  Combustion chambers.

•  Turbines.

•  Exhaust.

•  Thrust reversers.

•  Accessory drives.

•  Bearings and seals.

•  Maintenance requirements and troubleshooting procedures.

•  System and component operation, including electrical and instrument system interfaces:

•  Fuel control and fuels.

•  Lubrication and lubricants.

•  Air distribution.

•  Starting.

•  Ignition.

•  Power augmentation.

•  Instrumentation:

•  Performance indication.

•  Condition indication..

•  Warning

•  Presentation and interpretation of electronic displays.

•  Fire warning and extinguishing.

•  Control system and rigging of engine controls.

•  Engine spin/run procedures including the operation of auxiliary power units (APUs).

•  Engine condition monitoring.

•  Relevant WHS practices, including the requirements for the lifting and handling of heavy components.

•  How to obtain MSDS.

•  Selection and use of PPE.

•  Relevant maintenance manuals.

•  Relevant regulatory requirements and standard procedures.

(c) Assessment recommendation

      N/A

(a) Recommendation

      Different working environments and conditions that may affect performance are admissible in this field. Crucial 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.

(b) Description

     Gas turbine engine systems include:

•  Engine change unit, main components and accessories/drives.

•  Control system.

•  Ignition and starter systems.

•  Fuel system.

•  Oil system.

•  Air system.

   Procedures and requirements include:

•  Industry standard procedures specified by manufacturers, regulatory authorities or the enterprise.

•  The assessment are based on combination of paper exams, interviewing, and practical demonstrations depending on the assessors’ judgement.

•  Competency should be assessed in the work environment or simulated work environment using tools and equipment stated in aircraft maintenance manuals. It is also expected that applicable general-purpose tools, test and ground support equipment found in most routine situations would be used where appropriate. 

•  The level of troubleshooting is restrictedto its application to the use of fault diagnosis guides or other similar information.

•  The application of testing procedures and functional rigging checks should also indicate knowledge of system operation. Before undertaking any action, engine 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 rigging checks and troubleshoot the system within the limits of the aircraft/system fault-finding guide. The work plan should consider 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 and performance criteria of the unit of competency are being achieved under routine supervision on at least one (1) item from each of the following groups:

    Engine change unit, main components and accessories/drives

•  Control system.

•  Gnition and starter systems.

•  Fuel system.

•  Oil system.

•  Air system.

    This shall be proven via the records in the Log of Industrial Experience and Achievement or, where appropriate, an equivalent Industry Evidence Guide.