1、Lessons Learned Entry: 0948Lesson Info:a71 Lesson Number: 0948a71 Lesson Date: 1995-03-27a71 Submitting Organization: MSFCa71 Submitted by: Billy Cole / RetiredSubject: Solid Rocket Motor Case-to-Nozzle Joint: Replace Zinc Chromate Putty with Polysulfide Adhesive Description of Driving Event: The Ch
2、allenger (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
3、Challenger.Lesson(s) Learned: A polysulfide adhesive will provide a much more secure and impenetrable insulation joint than the Zinc Chromate Putty used in 51-L and previous solid rocket motors.Recommendation(s): Provide a polysulfide adhesive material to bond the carbon phenolic nozzle insulation m
4、aterial to the asbestos/silica filled Acrylonitrile Butadiene Rubber insulation in the rocket motor case.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 successf
5、ully 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 ResaleNo reproduction or networking permitted without license from IHS-,-,-N
6、/AMission Directorate(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 ResaleNo reproduction or networking permitted without license from IHS-,-,-
