REG NASA-LLIS-0159-1992 Lessons Learned - Line Replaceable Unit (LRU) Hoisting Operations.pdf

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1、Lessons Learned Entry: 0159Lesson Info:a71 Lesson Number: 0159a71 Lesson Date: 1992-10-13a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Line Replaceable Unit (LRU) Hoisting Operations Description of Driving Event: The orbiter processing facility (OPF) swing platforms are

2、used to access the space shuttle main engines (SSMEs), orbital maneuvering subsystem pods, and engine heat shields. Engine heat shields are removed every flow to perform turbopump torque checks. Heat shields with handling ground support equipment weigh approximately 300 pounds and are very awkward t

3、o handle, shaped in a 10-foot semi-circle. High pressure fuel and oxidizer turbopump (HPFTP and HPOTP) LRU operations require the east diving board be extended to provide access to SSME GIMBALLING and to permit pump removal. A design oversight limits LRU lifting operations to one location, level 19

4、of the OPF. An extended diving board interferes with the direct decent of flight hardware to the floor. To clear the diving boards during pump lowering/raising, the pumps are manually pulled away from the diving board with tag lines. This procedure side loads the hoist, a violation of standard NSS/G

5、O-1740.9. If the tag line operator misjudges the clearance past the diving boards, the pumps will be damaged.Lesson(s) Learned: Use of the east swing platform hoist trolley for lifting LRUs provides inadequate clearance/may result in flight hardware damage/personnel injury.Recommendation(s): Provide

6、 an air hoist trolley rail on the west swing platform to allow for a direct lift from OPF floor in an area where diving boards are extended.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Rel

7、ated to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Facilitiesa71 Ground Operationsa71 Ground Equipmenta71 Lifting DevicesAdditional Info: Approval Info: a71 Approval Date: 1994-06-15a71 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-,-,-