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lrm material specification session comments
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
lrm material specification session comments1
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
lrm material procurement specification path forward
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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