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Elements and Performance Criteria

1. Plan repair
3. Extent of damage is correctly assessed to assist in determining repair procedure
   • Structure is supported and prepared in accordance with the applicable maintenance manual to ensure personnel safety and freedom from damage
   • Appropriate bolted repair scheme is identified in accordance with structural repair manual and/or approved data
   • Specialist advice is obtained in establishing an approved repair scheme where a standard repair scheme cannot be identified or damage criteria are out of limits
   • All materials and equipment required are organised
4. Repair components using bolted patches
   • Damage is cleaned up ready for repair 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)
   • Patch material is obtained and patches are fabricated in accordance with the applicable repair scheme
   • Repair plug material is obtained and cut to size
   • Patches are fitted and secured with fasteners in accordance with the repair scheme while observing all relevant WHS requirements, including the use of MSDS and items of PPE
   • Applicable sealant is applied in accordance with the repair scheme
   • Surface finish is restored as required
   • Required maintenance documentation is completed and processed in accordance with standard enterprise procedures
   • Completed assemblies are tagged, sealed or packaged as required

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.
Bolted repairs include:	External Internal External/internal
Procedures and requirements include:	Industry standard procedures specified by manufacturers, regulatory authorities or the enterprise

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Performance 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 under the specified conditions of assessment, and must include:

applying while observing all relevant WHS requirements, including the use of MSDS and items of PPE

using approved maintenance documentation and aircraft publications relating to bolted repairs to composite aircraft skin

identifying composite component applications in aircraft structures

identifying various aircraft composite materials and their basic properties by interpretation of markings and visual means

identifying the range of bolted repair patch and repair plug materials

identifying applicable fasteners

identifying applicable sealants

assessing composite component damage using visual and tap test methods

performing composite skin bolted repairs:

external patch repair

internal patch repair

external/internal patch repair

correctly interpreting and/or producing repair scheme/modification drawings/sketches

using appropriate hand tools and machines to perform bolted repairs, including drilling/cutting equipment and material fasteners.

The underlying skills inherent in this unit should be transferable across the range of composite skin materials and patch materials and fasteners. Correct checking and wearing of PPE is critical.

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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:

aircraft construction principles and the causes of structural damage, including metal fatigue and corrosion

structural fatigue preventative measures

composite terminology and materials used

bolted repair methods

types of patch material

fastener types, specifications and identification

plug materials

use of scrim to prevent galvanic corrosion

sealants used in bolted patch repairs and their application and handling

paints and finishes for composite structure

WHS precautions associated with repair of aircraft structure

MSDS

relevant PPE.

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