REG NASA-LLIS-0073-1992 Lessons Learned - MLP 3 SRB Engine Service Platform Hoists.pdf

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1、Lessons Learned Entry: 0073Lesson Info:a71 Lesson Number: 0073a71 Lesson Date: 1992-04-28a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: MLP 3 SRB Engine Service Platform Hoists Description of Driving Event: The SRB platform testing began by loading the platform with 32,00

2、0 lbs. of sand. The load was lifted off the ground with a four winch slow speed lift. After clearing the ground, a high speed lift was initiated. An observer reported that a second wrap was beginning on the drums. A slow up mode was initiated and after approximately 12 inches of travel the observer

3、reported the drums were coming apart at the end ring welds. The platforms “C“ corner dropped then the “A“ corner dropped. The platform then flipped over, broke the cables and fell to the ground.Lesson(s) Learned: During a platform hoisting proof load test, the second layer of cable caused the end ri

4、ng welds to fail, breaking the cable, and dropping the load.Recommendation(s): Verify that all critical welds have been performed in accordance with specification 79K30047, SEC. 0510 “welding of carbon steel (structural)“.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson:

5、N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 Facilitiesa71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71 Lifting Devicesa71 Parts Materials & Processesa71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 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-,-,-