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Repair

Repair. WHEN IS REPAIR NECESSARY?. Quality Assurance applies acceptance criteria during in-process inspection, final inspection, and/or field inspection → part may be discrepant (defective) and rejected Discrepancy report (DR) written.

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Repair

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  1. Repair

  2. WHEN IS REPAIR NECESSARY? • Quality Assurance applies acceptance criteria during in-process inspection, final inspection, and/or field inspection → part may be discrepant (defective) and rejected • Discrepancy report (DR) written

  3. QUALITY ASSURANCE/ENGINEERING HAS TO CLASSIFY REPAIR REQUIRED • apply judgment • may be explicitly stated in repair criteria guideline (General Repair Specification) • repair classifications • rework • standard repair • Material Review Board (MRB) - members include Quality Assurance and Engineering

  4. EXAMPLE OF GENERAL REPAIR SPECIFICATION • Class IV - cosmetic, negligible repair - rework - non-structural repairs to bring part up to required drawing finish • Class III - minor structural repair - standard repair procedure applicable • Class II - major structural repair - standard repair procedure applicable • Class I - major structural repair - requires MRB review

  5. TYPES OF COMPOSITE REPAIRS • bolt on repair • filling • resin/adhesive/syntactic foam/composite • removing/filling • scarf repair (50:1 if possible)

  6. REPAIR MATERIALS • resins/adhesives • viscosity • cure time and temperature • syntactic foam/foaming adhesives • reinforcing fabric, milled fibers • preimpregnated fabric and tape

  7. WET SYSTEM ADVANTAGES • room temperature cure • can use minimal process materials and equipment

  8. PREPREG SYSTEM (HOT BONDERS) ADVANTAGES • resin content control • cleaner system to work with • may provide better match with existing material • Wichitech Composite Repair Systems

  9. REPAIR PROCEDURES • in general, these four steps are followed • surface preparation • application of material • cure: time, temperature, and pressure • finishing

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