1、Lessons Learned Entry: 1014Lesson Info:a71 Lesson Number: 1014a71 Lesson Date: 1997-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: International Space Station (ISS) Program/Ground Processing Schedule/Test and Verification Description of Driving Event: Lack of Schedule
2、 Slack in ISS Program Causing Potential Decrease in Prelaunch Ground TestingLesson(s) Learned: The schedules for ISS buildup are tight, and there is little, if any, schedule slack to accommodate late or unavailable hardware. Schedule and/or budget pressures could lead to deferring work to orbit or c
3、urtailing prelaunch testing.Recommendation(s): ISS program plans for finishing and testing hardware before launch should not be compromised to meet either launch schedules or budgets.Evidence of Recurrence Control Effectiveness: NASA concurs. Integration testing is in the approved programs current b
4、aseline. Prelaunch integrated testing at KSC is based on the degree to which this testing abates program risk, weighed against the hardware damage risk and the cost and schedule impacts. The content for component, subassembly, and element-level testing is the minimum requirement for specification co
5、mpliance verification. A program-approved change would be required to eliminate this work. In fact, integration and testing are being strengthened as opportunities develop. A proposal to conduct multi-element integration testing is being planned, which would exploit the unique KSC ground processing
6、expertise. This would involve actual flight hardware to conduct end-to-end testing for assembly elements 3A, 4A, 5A, and 6A in the manner that these elements would be assembled on-orbit. ISS program requirements for on-orbit stage and assembly-complete capability reflect a thoroughly Provided by IHS
7、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-reviewed baseline. This baseline generally reflects a minimum required capability, which has incorporated improvements to satisfy an achievable crew workload. There is strong inherent resistance in the program, theref
8、ore, to bringing incomplete hardware to be processed at KSC, much less than to orbit, because of the minimum capability constraints and crew workload impacts.Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Saf
9、ety Advisory Panela71 Ground Operationsa71 Policy & Planninga71 Risk Management/Assessmenta71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-11-20a71 Approval Name: Bill Loewya71 Approval Organization: QSa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
