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Repair. WHEN IS REPAIR NECESSARY? Quality Assurance applies acceptance criteria during in-process inspection, final inspection, and/or field inspection.

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Presentation on theme: "Repair. WHEN IS REPAIR NECESSARY? Quality Assurance applies acceptance criteria during in-process inspection, final inspection, and/or field inspection."— Presentation transcript:

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 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 Discrepancy report (DR) written

3 QUALITY ASSURANCE/ENGINEERING HAS TO CLASSIFY REPAIR REQUIRED apply judgment apply judgment may be explicitly stated in repair criteria guideline (General Repair Specification) may be explicitly stated in repair criteria guideline (General Repair Specification) repair classifications 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 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 III - minor structural repair - standard repair procedure applicable Class II - major structural repair - standard repair procedure applicable Class II - major structural repair - standard repair procedure applicable Class I - major structural repair - requires MRB review Class I - major structural repair - requires MRB review

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

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

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

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

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


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