1、Lessons Learned Entry: 0180Lesson Info:a71 Lesson Number: 0180a71 Lesson Date: 1992-10-23a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Solid Rocket Motor (SRM) Sealing Surfaces Description of Driving Event: A case dimensional change study performed as part of the 51-L fa
2、ilure analysis effort produced the diameter change results. The potential cause for this phenomenon is believed to be material related in three areas and their direct effect on the hydrostatic proof test pressure level chosen for acceptance testing prior to reuse.Lesson(s) Learned: Measurement of tw
3、o used SRM case segments indicated tang and clevis sealing surfaces increased in diameter beyond design limits.Recommendation(s): Redesign sealing surfaces to tolerate accepted proof pressure levels and utilize monitoring system to ensure compliance with design criteria/limits.Evidence of Recurrence
4、 Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Hardwarea71 Parts Materials & ProcessesAdditional 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-,-,-
