1、Lessons Learned Entry: 0953Lesson Info:a71 Lesson Number: 0953a71 Lesson Date: 1995-03-27a71 Submitting Organization: MSFCa71 Submitted by: Billy Cole / RetiredSubject: Solid Rocket Motor Case-to-Case Field Joint: Larger “O“ rings and “O“ ring grooves Description of Driving Event: The Challenger (Sp
2、ace Shuttle Flight #51L) accident triggered a detailed review of all of the joints in the Solid Rocket Motor. Analyses showed a potential weakness and potential flow paths for hot gasses through the case-to-nozzle joint that could cause a catastrophic event similar to that encountered in Challenger.
3、Lesson(s) Learned: Larger “O“ rings are needed to increase surface sealing contact area to prevent hot gasses from escaping through the field joint.Recommendation(s): Provide larger “O“ rings, and provide wider “O“ ring grooves to accommodate compression of the “O“ rings during assembly and operatio
4、n.Evidence of Recurrence Control Effectiveness: As of this date, eight-six (86) Solid Rocket Motors (RSRM) have flown successfully and ten (10) full-scale RSRM test motors have been tested successfully since Challenger with no failures and no evidence of joint deterioration or burn-through. This suc
5、cessful record indicates that recurrence control has been successful.Documents Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Ener
6、getic Materials - Explosive/Propellant/Pyrotechnica71 Launch VehicleAdditional Info: Approval Info: a71 Approval Date: 2001-07-23a71 Approval Name: Eric Raynora71 Approval Organization: QSa71 Approval Phone Number: 202-358-4738Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
