REG NASA-LLIS-0627-1999 Lessons Learned Criticality of Hardware Refurbishment Process.pdf

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1、Lessons Learned Entry: 0627Lesson Info:a71 Lesson Number: 0627a71 Lesson Date: 1999-07-20a71 Submitting Organization: ARCa71 Submitted by: Dave ZimmerSubject: Criticality of Hardware Refurbishment Process Description of Driving Event: Shortly after launch of STS-90, some of the motors/air-pumps asso

2、ciated with the aquatic habitats exhibited an increased power draw indicating either motor or pump failure. To successfully complete the mission, an in-flight procedure was utilized to cross-link each habitat to an operational air pump. Upon landing and recovery, an investigation was conducted of th

3、e failed motor/air-pump assemblies to determine why some units failed while others performed normally. The investigation determined that all of the units that operated properly were original equipment manufacture units, and the units that failed had all been refurbished.Lesson(s) Learned: It was dis

4、covered that during the refurbishment process for the air pump, that a different material was utilized for an internal pump component that resulted in increased rotational friction and a failure to meet the specified operational life requirement. Insufficient detail and documentation was supplied fo

5、r the refurbishment process.Recommendation(s): When developing or evaluating a hardware refurbishment process, care must be taken to ensure that the refurbishment will comply with the specified basic design requirements for the part or component with regards to:1. Dimensional tolerances2. Material s

6、pecifications and properties3. Assembly processes4. Acceptance testingProvided 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): a71 Exploration Systemsa71

7、Sciencea71 Aeronautics ResearchAdditional Key Phrase(s): a71 Flight Equipmenta71 Hardwarea71 Parts Materials & Processesa71 Payloadsa71 Research & Developmenta71 Safety & Mission Assurancea71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 1999-08-02a71 Approval Name: Anthony Bricenoa71 Approval Organization: N244-30a71 Approval Phone Number: 415-604-1012Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-