REG NASA-LLIS-0455-1991 Lessons Learned - Nonmetallic Materials Certification.pdf

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1、Lessons Learned Entry: 0455Lesson Info:a71 Lesson Number: 0455a71 Lesson Date: 1991-08-19a71 Submitting Organization: JSCa71 Submitted by: L. UnderwoodSubject: Nonmetallic Materials Certification Description of Driving Event: A flight life support system battery leaked when a vendor substituted the

2、certified material with a substitute in the manufacturing of the relief valves and the electrolyte decomposed it. The vendor certification was for the original material only. Substitute materials generally require recertification prior to use.Lesson(s) Learned: Vendors materials certification proces

3、ses must specify recertification for substitute materials.Recommendation(s): In critical applications, physical properties testing must be accomplished to assure that materials substitutions are acceptable.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Direc

4、torate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AAdditional Key Phrase(s): a71 Parts Materials & Processesa71 Safety & Mission AssuranceAdditional Info: Approval Info: a71 Approval Date: 1996-09-30a71 Approval Name: Ron Montaguea71 Approval Organization: JSC/NA3a71 Approval Phone Number: 281-483-8576Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-