REG NASA-LLIS-0956-1995 Lessons Learned Solid Rocket Motor Case-to-Case Field Joint Added Leak Check Port.pdf

1、Lessons Learned Entry: 0956Lesson Info:a71 Lesson Number: 0956a71 Lesson Date: 1995-03-27a71 Submitting Organization: MSFCa71 Submitted by: Billy Cole / RetiredSubject: Solid Rocket Motor Case-to-Case Field Joint: Added Leak Check Port Description of Driving Event: The Challenger (Space Shuttle Flig

2、ht #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.Lesson(s) Learne

3、d: A second leak check port is required because of the third “O“ ring that was added in the capture feature, and to provide a port to verify and seat the primary “O“ ring.Recommendation(s): Add a second leak check port in the field joint tang.Evidence of Recurrence Control Effectiveness: As of this

4、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 successful record indicates that recurrence control has been s

5、uccessful.Documents Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission 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-,-,-