1、Lessons Learned Entry: 0141Lesson Info:a71 Lesson Number: 0141a71 Lesson Date: 1992-10-05a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Radioisotope Thermoelectric Generator Facility (RTGF) Lifting Operations Description of Driving Event: The 10-ton crane at the RTGF is u
2、sed to lift and position radioisotope thermoelectric generators and ground support equipment. Crane electrical component failure increases the risk of load and/or crane damage. Failure of switches 3 or 4 results in bridge movement and bridge brake will not engage if a BR-1 relay failure occurs. Fail
3、ure of switches 5 or 6 results in trolley movement and trolley brake will not engage if a BR-2 relay failure occurs. Failure of switches 7 or 8 results in hoist movement and hoist brake will not engage if a BR-3 OR BR-4 relay failure occurs. Failure of switch SW-2 in the fast speed position will res
4、ult in the hoist operating in the fast speed even if the operator selects slow speed.Lesson(s) Learned: Failure of the RTGF crane electrical components, due to an internal malfunction, increases the potential for damage to load and/or crane.Recommendation(s): Install an emergency stop switch on the
5、crane operators control pendant to enable immediate power removal/setting of brakes in emergency situation.Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Direct
6、orate(s): N/AAdditional Key Phrase(s): a71 Facilitiesa71 Lifting DevicesAdditional Info: Approval Info: a71 Approval Date: 1994-06-03a71 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-,-,-
