REG NASA-LLIS-0959-1995 Lessons Learned Solid Rocket Motor Factory Joint Insulation Safety Factors.pdf

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1、Lessons Learned Entry: 0959Lesson Info:a71 Lesson Number: 0959a71 Lesson Date: 1995-03-27a71 Submitting Organization: MSFCa71 Submitted by: Billy Cole / RetiredSubject: Solid Rocket Motor Factory Joint Insulation: Safety Factors Description of Driving Event: The Challenger (Space Shuttle Flight #51L

2、) 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 Challenger.Lesson(s) Learned: A saf

3、ety factor of at least 2.00 is required for factory joints in solid rocket motors.Recommendation(s): Provide additional insulation plies to provide a safety factor at or above 2.0 for solid rocket motor factory joints. (Three to six extra plies were required to achieve this margin in the Space Shutt

4、le Solid Rocket Motor.)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 b

5、urn-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/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Ke

6、y 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-,-,-