1、Lessons Learned Entry: 0162Lesson Info:a71 Lesson Number: 0162a71 Lesson Date: 1992-10-15a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Orbiter/ET Feedline Mating Stud Tensioner. Description of Driving Event: The orbiter/ET feedline mating stud tensioner unit exposes pers
2、onnel to a high pressure source and could result in injury or flight hardware damage. During ratcheting of the nut onto the stud, personnel will be in the vicinity of high-pressure fluid, water, and rust inhibitor at 11,600 psig. Three stud tensioner heads, connected by six hoses through a common ma
3、nifold, are used to apply a tension load of 64,000 lbs maximum to three cryogenic umbilical separation bolts by means of an air-driven hydraulic pumping unit.Lesson(s) Learned: A potential exists for a high pressure fluid leak, over-pressurization, improper stud tensioning, and/or flexhose rupture a
4、nd whipping.Recommendation(s): Require personnel to use proper protective clothing and safety equipment during the procedure used for the stud tensioner.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
5、Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Flight Equipmenta71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71 Personal Protective EquipmentAdditional Info: Approval Info: a71 Approval Date: 1994-06-06a71 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-,-,-
