1、Lessons Learned Entry: 0033Lesson Info:a71 Lesson Number: 0033a71 Lesson Date: 1992-09-17a71 Submitting Organization: KSCa71 Submitted by: Lisa L.MusgraveSubject: External Tank (ET) Vent System Withdrawal Weight Securing Device Description of Driving Event: The 1500-pound withdrawal weight for the E
2、T LH2 vent line must be raised to access the withdrawal weight shock absorbers to perform maintenance. Personnel work directly beneath the withdrawal weight, held in place with a 125 psi air-operated winch and 5/8“ diameter wire rope. The system design does not include a secondary means to secure th
3、e weight if the winch or wire rope fails, so workers shore the weights with pieces of wood or other available material that will brace the weights. The improperly used shoring devices could break under the load of the weights, causing injury to personnel.Lesson(s) Learned: A withdrawal weight suppor
4、t failure during shock absorber maintenance may result in personnel injury/fatality and/or equipment damage.Recommendation(s): Incorporate a removable withdrawal weight securing device that will prevent unintended downward movement of the withdrawal weight.Evidence of Recurrence Control Effectivenes
5、s: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Facilitiesa71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71
6、Industrial Operationsa71 Launch Processa71 Launch Vehiclea71 Lifting Devicesa71 Safety & Mission AssuranceAdditional Info: Approval Info: a71 Approval Date: 1994-06-01a71 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-,-,-
