1、Lessons Learned Entry: 0601Lesson Info:a71 Lesson Number: 0601a71 Lesson Date: 1998-09-10a71 Submitting Organization: JPLa71 Submitted by: E. Cherniack/D. OberhettingerSubject: Need for Power Subsystem Spares (1998) Abstract: Galileo and Deep Space 1 failures during ground test and integration damag
2、ed power subsystem modules, demonstrating the importance of an adequate supply of these spares. Since power subsystem modules are particularly susceptible to damage during ground test, project sparing policy - even for low cost missions- should allow for unplanned consumption of spacecraft power sub
3、system modules.Description of Driving Event: Innovative, low cost approaches to NASA spaceflight missions may include a reduced inventory of flight hardware spares. However, experience throughout JPL flight project history illustrates the importance of an adequate supply of spare power subsystem mod
4、ules. Both the Galileo and Deep Space 1 projects sustained major damage to power subsystem modules or assemblies due to spacecraft equipment failures during ground test and integration.Since high voltage and current exist in power subsystems, failures that affect power equipment tend to cause more h
5、ardware damage than other electrical failures. Occasionally during ground test, short circuits occur which char spacecraft power subsystem components or vaporize modules to the extent that they are unrepairable. If this occurs close to the launch date, acquisition of replacement units may be impossi
6、ble without impacting the launch schedule.Additional Keyword(s): PPS, Power Module, Power Converter Unit, PCU, GLL, DS1Lesson(s) Learned: Power subsystems are particularly susceptible to damage during ground test that is likely to deplete Provided by IHSNot for ResaleNo reproduction or networking pe
7、rmitted without license from IHS-,-,-the spares inventory.Recommendation(s): Project sparing policy - even for low cost missions- should allow for unplanned consumption of spacecraft power subsystem modules during test and integration.Evidence of Recurrence Control Effectiveness: N/ADocuments Relate
8、d to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Energya71 LogisticsAdditional Info: Approval Info: a71 Approval Date: 1998-09-11a71 Approval Name: Carol Dumaina71 Approval Organization: 125-204a71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
