7232 Aircraft engine mechanics and fitters  

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

(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 practices, including the lifting and handling of heavy components.

•    Using relevant maintenance documentation and aircraft manuals to:

•    Recognise, through visual/physical inspection, external signs of defects or rigging abnormalities in propellers and propeller system components.

•    Functionally test propellers and propeller systems and recognise any indication of malfunction or incorrect rigging or adjustment.

•    Rig and adjust propeller controls and systems.

•    Using fault diagnosis guides and equivalent data to accurately and efficiently troubleshoot the causes of unserviceability in propellers and propeller 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 propeller systems. It is crucial that system test procedures consider all safety precautions associated with propeller system operation, and that awareness be demonstrated of dual inspection requirements associated with work on propeller 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 number of propeller systems or propeller types.

(b) Knowledge 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 and include knowledge of:

•   Fault diagnosis techniques.

•   Propeller system layout and operation:

•   Propeller types.

•    Propeller terminology.

•   Forces acting on a propeller.

•   Propeller construction.

•   Propeller operation.

•   Pitch changing mechanisms.

•   Governors and beta control.

•   Controls and rigging of propeller controls.

•   Maintenance requirements and troubleshooting procedures.

•   Ancillary systems and system component operation, including electrical and instrument system interfaces:

•   De-icing and anti-icing.

•   Multi-engine synchronising and synchrophasing.

•   Feathering and unfeathering, including auto feathering.

•   Pitch reversal.

•   Negative torque sensing and protection.

•   De-coupling.

•   Braking.

•   Thrust and torque measuring and indication.

•   Maintenance requirements and troubleshooting procedures.

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

•   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

      Propeller and propeller systems include:

•    Propellers, including spinners, where fitted.

•    Constant speed, feathering and reversing propeller drives.

•    Beta control systems and governors.

•    Controls and linkages.

•    De-ice/anti-ice equipment (where applicable to the enterprise).

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 maintenance manuals. It is also expected that general-purpose tools, test and ground support equipment found in most routine situations would be used where appropriate.

•    The application of testing procedures should clearly indicate knowledge of system operation. Before undertaking any action, System operation knowledge, the relationship of individual components and the links with other systems will be necessary to supplement evidence of ability to troubleshoot the system within the limits of the aircraft/system fault-finding guide. The work plan should consider applicable safety and quality requirements according to 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 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:

•    Propellers, including spinners, where fitted.

•    Constant speed, feathering and reversing propeller drives.

•    Beta control systems and governors.

•    Controls and linkages.

•    De-ice/anti-ice equipment (may be omitted where it is not applicable to the enterprise).

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