102 Aircraft Mechanics: Helicopters

102301 Remove and install rotary wing rotor and flight control system 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

          • using relevant maintenance documentation and aircraft manuals to:

          • recognise through visual/physical inspection external signs of defects in the rotor, rotor head, tail rotor and flight control mechanical system components

          • ground test the rotor and control system and recognise correct function

          • rig and adjust rotor controls and systems

          • using fault diagnosis guides and equivalent data to accurately and efficiently troubleshoot the causes of unserviceability in rotor control 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 the rotor control systems. It is crucial that testing procedures consider all safety precautions associated with ground testing of rotor and rotor control systems, and that awareness be demonstrated of dual inspection requirements associated with work on 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 systems 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:

          • fault diagnosis techniques

          • standard trade practices relating to tool and test/rigging equipment usage

          • 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

          • clutches and freewheeling units

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

          • cyclic pitch control

          • collective pitch control

          • tail rotor control

          • mechanical and powered control systems

          • engine control interface

          • torque reaction and anti-torque devices

          • engine indication

          • vibration monitoring

          • helicopter maintenance procedures and troubleshooting

          • relevant maintenance manuals

          • relevant regulatory requirements and standard procedures including requirements forengine and rotor system operation

          • relevant WHS practices.

(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 systems include:

          • Main rotor blades and tail rotor blades

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

          • Mechanical, powered flight control components

          • Main rotor, intermediate or tail rotor gearboxes

          • Drive shafts and couplings

          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 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 application of ground 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.

          • Functional testing of rotors and rotor control systems with engine/s running may be performed with the applicant directing a pilot qualified on type.

• 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:

          • main rotor blades and tail rotor blades

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

          • mechanical, powered flight control components

          • main rotor, intermediate or tail rotor gearboxes

          • drive shafts and couplings.

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

          • Individuals being assessed who have already attained 102303 Maintain basic rotary wing aircraft systems will have satisfied the requirements of this unit with regard to common Range of Conditions variables. The Log of Industrial Experience and Achievement records relating to 102303 Maintain basic rotary wing aircraft systems may be accepted as also meeting the evidence requirements for this unit in the applicable common areas.