REG NASA-LLIS-0056-1992 Lessons Learned - Inadvertent Quick Disconnect (Q D ) Nipple Separation.pdf

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1、Lessons Learned Entry: 0056Lesson Info:a71 Lesson Number: 0056a71 Lesson Date: 1992-01-27a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Inadvertent Quick Disconnect (Q.D.) Nipple Separation Description of Driving Event: During hydrazine servicing of the left hand SRB tilt

2、 system, the fill/drain quick disconnect (Q.D.) nipple separated during cap removal, allowing the entire 3 1/2 gallon load to drain onto the MLP deck. The Q.D. nipple separation occurred because of nipple to cap thread seizure, caused by pressure build-up between the Q.D. and cap. Current design all

3、ows the possibility of Q.D. nipple removal while trying to remove Q.D. cap. The technician had no visual clue that the nipple was turning because of the scupper installation. The technician was drenched with hydrazine during the incident.Lesson(s) Learned: Lack of anti-rotational devices may allow Q

4、.D. nipple to separate from the Q.D. when a technician attempts to remove the Q.D. cap.Recommendation(s): Design and install locking anti-rotational devices to prevent inadvertent removal of fuel system Q.D. nipples.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provid

5、ed 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 Energetic Materials - Explosive/Propellant/Pyrotechnica71 Flight Equipmenta71 Ground Operationsa71 Ground Eq

6、uipmenta71 Launch Processa71 Launch Vehiclea71 Packaging Handling Storagea71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1994-06-01a71 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-,-,-