1、Lessons Learned Entry: 0957Lesson Info:a71 Lesson Number: 0957a71 Lesson Date: 1995-03-27a71 Submitting Organization: MSFCa71 Submitted by: Billy Cole / RetiredSubject: Solid Rocket Motor Nozzle Internal Seals: Dual “O“ Ring Seals and Leak Check Ports 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: Dual “O“ ring seals, with leak check ports in between, are required for nozzle seals in solid propellant rocket motors.Recommendation(s): Provide a primary and secondary seal for all internal nozzle joints, with a leak check port in between the two seals to confirm seal integrity.
4、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 succe
5、ssful 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 Energe
6、tic 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-,-,-
