1、Lessons Learned Entry: 0947Lesson Info:a71 Lesson Number: 0947a71 Lesson Date: 1995-03-27a71 Submitting Organization: MSFCa71 Submitted by: Billy Cole / RetiredSubject: Solid Rocket Motor Case-to-Nozzle Joint: Interference Fit Bondline Case and Nozzle Insulation Description of Driving Event: The Cha
2、llenger (Space 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 he case-to-nozzle joint that could cause a catastrophic event similar to that encountered in C
3、hallenger.Lesson(s) Learned: An interference fit is required between case and nozzle insulation to prevent hot gas leakage between the insulation that could reach the joints metal parts.Recommendation(s): Provide a compression fit that will force the case and nozzle insulation components together du
4、ring nozzle assembly. This interference fit is maintained during motor case pressurization due to the pressurizing slot provided in the case insulation.Evidence of Recurrence Control Effectiveness: As of this date, eight-six (86) Solid Rocket Motors (RSRM) have flown successfully and ten (10) full-s
5、cale RSRM test motors have been tested successfully since Challenger with no failures and no evidence of joint deterioration or burn-through. This successful record indicates that recurrence control has been successful.Documents Related to Lesson: Provided by IHSNot for Resale-,-,-N/AMission Directo
6、rate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Energetic 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 Resale-,-,-
