REG NASA-LLIS-0177-1992 Lessons Learned - Solid Rocket Motor (SRM) O-ring.pdf

1、Lessons Learned Entry: 0177Lesson Info:a71 Lesson Number: 0177a71 Lesson Date: 1992-10-23a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Solid Rocket Motor (SRM) O-ring Description of Driving Event: The o-ring used in the SRM case joint is critical to the sealing of the jo

2、int, yet is not designated as a critical process. The adequacy of o-ring processing and quality control is questionable even though a number of o-rings in bonded storage were thoroughly analyzed and tested as part of 51-L failure analysis effort and found to be acceptable. The manufacturing process

3、included delivery of the final o-ring rubber material to where the material is cut to the proper lengths and a scarf joint is made. This manufacturing process is a potential problem area as seen by repairs of inclusions and voids in the rubber delivered.Lesson(s) Learned: The adequacy of o-ring proc

4、essing, quality control and material delivery-to-processing is questionable.Recommendation(s): Investigate and eliminate potential problems in manufacturing process, final delivery and material cutting of the o-ring.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot for ResaleNo rep

5、roduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Flight Equipmenta71 Industrial Operationsa71 Risk Management/AssessmentAdditional Info: Approval Info: a71 Approval Date: 1994-06-06a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-