102 Aircraft Mechanics: Helicopters

101301 Interpret work health and safety practices in aviation maintenance

101302 Apply quality standards applicable to aviation maintenance processes

101303 Interpret and use aviation maintenance industry manuals and specifications

101304 Complete aviation maintenance industry documentation

101305 Perform basic hand skills, standard trade practices and fundamentals inaviation maintenance

(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:

          • using hand skills, tools and test equipment in the testing, adjustment and troubleshooting of:

          • rotary wing mechanical control systems

          • helicopter airframe systems and components, including rotors and rotor system

          • recognising system and component defects/external damage, correct installation and security for the range of airframe systems listed in the Range of Conditions

          • removing, installing and rigging of rotor systems and rotor/flight controls

          • removing and installing the range of airframe components listed in the Range of Conditions

          • checking rotor mass balance

          • 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 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 the, rotors, rotor control systems, airframe systems and components of basic rotary wing aircraft. It is crucial that relevant procedures, requirements for cleanliness and safety precautions are fully perceived, understood and complied with.

          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 rotors, rotor control systems, airframe systems and components as specified in the Assessment Conditions.

(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:

          • WHS precautions relevant to airframe system maintenance, including the lifting and handling of heavy components and how to obtain PPE and MSDS

          • standard trade practices relating to tool and test/rigging equipment usage and installation/securing of system components

          • theory of flight:

          airflow

          conditions of flight

          lift and forces

          drag

          • rotary flight principles:

          • terminology relating to:

          • aerofoils

          • main rotor blades

          • rotor discs

          • rotors (main and tail)

          • aerodynamic characteristics:

          • aerofoil design

          • forces

          • rotor thrust and power requirements

          • vortex ring

          • autorotation

          • helicopter stability

          • helicopter dynamic components:

          • main rotors:

          • blades

          • heads

          • linkages

          • tail rotors

          • swash plates

          • transmissions and drive shafts

          • helicopter structure and airframe systems:

          • structure and layout

          • engine and transmission

          • flight control system layout and operation

          • cabin heater system layout and operation

          • fuel system layout and operation

          • helicopter maintenance procedures and troubleshooting

          • relevant maintenance manuals

          • relevant regulatory requirements and standard procedures, including requirements for engine and rotor system operation

(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

          Rotor and rotor control system components include:

          • Main rotor blades and tail rotor blades

          • Rotor heads, swash plates and tail rotor pitch control assemblies

          • Mechanical flight control components (collective and cyclic pitch levers, rudder pedals, cables, pulleys, guides, fairleads, bellcranks, rods, torque tubes, chains and sprockets)

          • Main rotor, intermediate or tail rotor gearboxes

          • Drive shafts and couplings

          Engine and rotor system operation:

          • Must be performed by a qualified pilot

          Airframe systems include:

          • Fuel systems

          • Cabin heating systems

          Airframe system components include:

          • Rigid or flexible fuel tanks, selector/shutoff valves and rigid or flexible plumbing

          • Cabin heater ducting and control valves

          Procedures and requirements include:

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

          • The assessment are composed of paper exams , interviews, and practical demonstrations, which the paper exam is the main testing. The selection of interviews and practical demonstrations are depending on the assessors’ judgment.

          • Competency should be assessed in the work environment or simulated work environment using tools and equipment stated 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.

          • Before undertaking any action, 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. The work plan should consider 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 and performance criteria of this unit of competency are being achieved under routine supervision on groups listed in the Range of Conditions, as follows:

          • at least one (1) component from each of:

          • main rotor blades and tail rotor blades

          • rotor heads, swash plates and tail rotor pitch control assemblies

          • mechanical flight control components (collective and cyclic pitch levers, rudder pedals, cables, pulleys, guides, fairleads, bellcranks, rods, torque tubes, chains and sprockets)

          • main rotor, intermediate or tail rotor gearboxes

          • drive shafts and couplings

          • fuel systems

          • cabin heating systems

          • a representative range of components from:

          • rigid or flexible fuel tanks, selector/shutoff valves and rigid or flexible plumbing

          • cabin heater ducting and control valves.

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