1、Lessons Learned Entry: 0616Lesson Info:a71 Lesson Number: 0616a71 Lesson Date: 1998-10-14a71 Submitting Organization: MSFCa71 Submitted by: Lorraine Raby & Rhonda PepperSubject: Building 4777 Impeller Tip Failure Description of Driving Event: Water flow pump impeller blade tips failed during testing
2、 at MSFCs Inducer Test Loop (ITL). All three inducer tips were discovered missing during inspection of the pump. An investigation team determined that impeller tip failure was caused by degradation of aluminum impeller material (caused by anodizing and/or heat treat) and/or high impeller dynamic flo
3、w forces.Lesson(s) Learned: Dont anodize thin aluminum impeller blades.Recommendation(s): See Lesson(s) Learned.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without lic
4、ense from IHS-,-,-Additional Key Phrase(s): a71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1999-03-29a71 Approval Name: Frank Hepburna71 Approval Organization: CR10a71 Approval Phone Number: 205-544-1806Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
