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Abbreviation: CAW = Continuing Airworthiness Division. M&M = Maintenance & Manufacturing. SDR = Service Difficulty Report. SUP = Suspected Unapproved Parts. HQ = Headquarters. Appendix A – Headquarters Procedures. Suspected unapproved part is discovered. This could be by an operator, AMO, manufacturer, AME, or by a Civil Aviation Safety Inspector. A service difficulty report is completed and ... ................
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