Lrm material specification session comments
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LRM Material Specification – session comments

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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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