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Composite Material Procurement Guidelines: Key Characteristics and Quality Assurance

This document provides guidelines for composite material procurement, emphasizing key characteristics, quality assurance responsibility, and level change criteria. It clarifies testing requirements, resin types, and division of responsibilities. The language used is guideline-oriented, not strictly requirement-based.

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Composite Material Procurement Guidelines: Key Characteristics and Quality Assurance

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  1. LRM Material Specification – session comments • Statement within beginning of document concerning that this document is a general guideline and there are other techniques – these are not requirements – specific intent of document should be stated – “man rated FAA structure” – different level of risk - “a means but not the only means” – language within document should be “guideline language” not “requirement language” • Who is responsible to ensure quality and safety? Material Supplier / OEM – Document is not intended to move responsibility to material supplier – material supplier does not have control of end product in the case of LRM – different from prepreg – material supplier comes under the OEM quality system • Certification/Acceptance tests should be reduced to key characteristics • Classification of parts should be added to document (Must comply with FAA needs, PSEs, Critcal parts) • Look at level change criteria with respect to prepreg document – make LRM specific – align with MIL-17 change Table • Discussion of the use of caul plates and single sided molded processes • Clean room requirements – why? – too specific – possibly reduce

  2. LRM Material Specification – session comments • For second source – discuss process to qualify and demonstrate allowables • Equivalence baseline database – why equivalency baseline database (wording?) – page 41 • Binder changes in the future • What is a batch definition for a cured product? – common to mix resin batches for infusion processes

  3. LRM Material Procurement SpecificationPath Forward • Identify applicability of document • Reinforce document provides guidelines as means of showing compliance to requirements. Eliminate “shall” terminology. Provide examples. • Evaluate testing requirements: certification, receiving inspection, and qualification. • Address one-part and two-part resins • Clarify division of responsibility between suppliers, part fabricators, end-user, and OEM. • Clarify change level definitions. • Clarify cured composite definition.

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