REG NASA-LLIS-0197-1992 Lessons Learned - Line Replaceable Unit (LRU) Cannibalization.pdf

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1、Lessons Learned Entry: 0197Lesson Info:a71 Lesson Number: 0197a71 Lesson Date: 1992-11-04a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Line Replaceable Unit (LRU) Cannibalization Description of Driving Event: The practice of cannibalization has almost become a standard p

2、rocedure during orbiter processing due to insufficient spare parts. This causes a significant increase in the overall processing effort. The removal of a needed LRU from the orbiter being cannibalized is an unplanned activity. A second activity, installing the removed LRU in the receiving orbiter, h

3、as usually been allowed for in the overall contingency planning; but the process flow time is impacted because it takes longer to cannibalize a part than to retrieve one from storage. When a LRU is obtained and reinstalled in the cannibalized orbiter, it must be retested. The replacement of the remo

4、ved LRU and its retest are added work. Also, the increase in activity required for the unscheduled removal/replacement always increases the potential for damage. The follow-on tests that are performed to verify that no damage occurred are another unplanned addition to the workload. Three hundred par

5、ts were required during the launch processing of challenger for the STS 51-L mission. Of these, 45 were cannibalized from OV-103. In future decisions on whether to use a spare LRU or cannibalize, the use of a spare, when available, should be considered the first choice. Overall, cannibalization is a

6、n inefficient way to process an orbiter.Lesson(s) Learned: The orbiter logistics system and spares supporting the 51-L mission were inadequate, causing the need for significant LRU cannibalization.Recommendation(s): Periodically update spare parts list based on flight experience and quantities, and

7、store spare parts in a ready-to-use condition.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Ground Operationsa71 LogisticsAdditional Info: Approval Info: a71 Approval Date: 1994-06-06a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-