REG NASA-LLIS-0147-1992 Lessons Learned - OMS Engine Injector Ball Joints.pdf

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1、Lessons Learned Entry: 0147Lesson Info:a71 Lesson Number: 0147a71 Lesson Date: 1992-10-02a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: OMS Engine Injector Ball Joints Description of Driving Event: The orbital maneuvering system engine trickle purge system is used to prev

2、ent oxidation/corrosion damage to the OMS engine injector ball joints. A 1.0 - 1.5 SCFM GN2 flow is applied during post-landing ground operations. Undetected loss of GN2 purge to OMS engine injector cavities could eventually corrode the vehicle system.Lesson(s) Learned: Failure of the OMS engine tri

3、ckle purge system lasting more than 96 hours will result in corrosion of the injector ball valves.Recommendation(s): Design a GN2 purge detection system that could be monitored electronically and sound an audible alarm at the operations desk if the purge should fail.Evidence of Recurrence Control Ef

4、fectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Flight Equipmenta71 Ground Operationsa71 HardwareAdditional 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-,-,-