1、Lessons Learned Entry: 0135Lesson Info:a71 Lesson Number: 0135a71 Lesson Date: 1992-09-25a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Vertical Assembly Building (VAB) Major Lifting Operations Description of Driving Event: The 175-ton and two 250-ton VAB cranes are used
2、to perform solid rocket booster (SRB) stacking, external tank (ET)/SRB mate, and orbiter/ET mate. The 250-ton and 175-ton cranes operate on crane rails 466 feet and 168 feet above the VAB floor, respectively. Crane motions are controlled from the console of the crane cab. The cab is equipped with fo
3、ur master switches which control movement of main and auxiliary hoist load blocks and trolley and bridge travel. The main and auxiliary hoist and trolley and bridge drives are redundant configurations utilizing motor-generator sets that supply energy to the DC final drive motors.Lesson(s) Learned: F
4、ailure of 250/175-ton crane DC power loop or DC control loop critical components could result in damage/loss of flight hardware/GSE or injury.Recommendation(s): Perform periodic preventative maintenance, testing, and pre-operational checks on 250/175-ton cranes to ensure support lifting operation re
5、adiness.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Facilitiesa71 Lifting Devicesa71 LogisticsAdditional 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-,-,-
