1、Lessons Learned Entry: 1050Lesson Info:a71 Lesson Number: 1050a71 Lesson Date: 1998-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Space Shuttle Program/Reusable Solid Rocket Motor (RSRM)/Flight Support Motor (FSM) Description of Driving Event: Flight Support Motor (F
2、SM) Test IntervalsLesson(s) Learned: Obsolescence changes to the RSRM processes, materials, and hardware are continuous because of changing regulations and other issues impacting RSRM suppliers. It is extremely prudent to qualify all changes in timely, large-scale Flight Support Motor (FSM) firings
3、prior to produce/ship/fly. NASA has recently reverted from its planned 12-month FSM firing interval to tests on 18-month intervals.Recommendation(s): Potential safety risks outweigh the small amount of money that might be saved by scheduling the FSM motor tests at 18-month intervals rather than 12 m
4、onths. NASA should realistically reassess the test intervals for FSM static test firings to ensure that they are sufficiently frequent to qualify, prior to motor flight, the continuing large number of materials, process, and hardware changes. Evidence of Recurrence Control Effectiveness: Evaluation
5、of all known reusable solid rocket motor (RSRM) future material, process, and hardware changes (by NASA and Thiokol) has confirmed no safety risk impact resulting from FSM static tests every 18 months, in lieu of every 12 months. The RSRM Project goal to “include all changes in a static test prior t
6、o flight incorporation“ has not changed, and any exceptions will continue to be approved by the Space Shuttle Program Manager before flight incorporation. If a change is planned in the future wherein an 18-month FSM static test frequency is insufficient to support qualification Provided by IHSNot fo
7、r ResaleNo reproduction or networking permitted without license from IHS-,-,-prior to motor flight, program funding requirements will be considered to accelerate an FSM static test to ensure no increased program flight safety risk.Documents Related to Lesson: N/AMission Directorate(s): a71 Space Ope
8、rationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Environmenta71 Parts Materials & Processesa71 Policy & Planninga71 Risk Management/Assessmenta71 Safety & Mission Assurancea71 Test & Verificationa71 Test ArticleAdditional Info: Approval Info: a71 Approval Date: 2001-12-13a71 Approval Name: Bill Loewya71 Approval Organization: HQa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
