1、Lessons Learned Entry: 0452Lesson Info:a71 Lesson Number: 0452a71 Lesson Date: 1991-07-11a71 Submitting Organization: JSCa71 Submitted by: L. UnderwoodSubject: Failure Analysis Investigation Description of Driving Event: The failure analysis of a temperature probe for a cryogenic hydrogen system was
2、 investigated by instrumentation systems engineering for effects on the instrumentation system (loss of output from one temperature sensor which is minor). The potential effects of the defective weld (piece of the probe entering the liquid hydrogen system) was not recognized till later as catastroph
3、ic.Lesson(s) Learned: Failure analysis of a component in a system did not consider the effects of the failure on the system.Recommendation(s): Evaluate the effect of a component failure on the system when investigating the failure of a component in a system.Evidence of Recurrence Control Effectivene
4、ss: N/ADocuments Related to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AAdditional Key Phrase(s): a71 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-,-,-
