REG NASA-LLIS-0074-1992 Lessons Learned - Pad B External Tank (ET) Platform Hoist.pdf

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1、Lessons Learned Entry: 0074Lesson Info:a71 Lesson Number: 0074a71 Lesson Date: 1992-04-30a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Pad B External Tank (ET) Platform Hoist Description of Driving Event: A technician was working on the ET access platform, attempting to

2、close the bifold doors on the 155 foot level of Pad B. The brake released on the hoist that was holding the platform that the technician was standing on. The platform gave way and the technician fell about 15 feet. He suffered a broken left ankle and other minor bruises.Lesson(s) Learned: Failure of

3、 clutch to provide a positive engagement between the drum, shaft, gear train, and break allowed the hoists drum to begin free wheeling.Recommendation(s): Modify the hoists clutch assembly to ensure that it provides a positive mechanical engagement that will prevent free wheeling.Evidence of Recurren

4、ce Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AAdditional Key Phrase(s): a71 Facilitiesa71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71 Lifting DevicesAdditional 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-,-,-