1、Lessons Learned Entry: 0143Lesson Info:a71 Lesson Number: 0143a71 Lesson Date: 1992-10-05a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Engine Changeout Platform (ECP) and Engine Service Platform (ESP) Hoisting Description of Driving Event: The ESP and ECP are designed to
2、 support maintenance and replacement of space shuttle main engines (SSMEs) while the orbiter is in a vertical position. Both platforms utilize the same hoisting system, located on level B of the mobile launch platform (MLP). A combination of four hoists raise and lower the platforms through the SSME
3、 exhaust hole. The platforms are secured to the MLP prior to SSME maintenance/installation. A design certification review was performed on the platforms. The review identified three non-compliances to design standards as givin by KSC-STD-Z-0002B, standard for design requirments for lifting and hoist
4、ing equipment. These are (1) no emergency stop switch, (2) no final upper limit switch, and (3) only one holding brake. However, the upper limit switch was shown to be impractical due to varying heights of the platforms, proximity of the platforms to the tail service mast, and independent operation
5、of the winches. A failure in the hoisting system during raising/lowering could cause the platform to tip, resulting in damage/loss of a SSME, ground support equipment, or MLP.Lesson(s) Learned: Failure of wire ropes, winch components, or operator error during hoist operation with ECP/ESP could resul
6、t in damage/loss of flight hardware/GSE.Recommendation(s): Install an emergency stop switch and a redundant holding brake to ECP and ESP hoisting systems to comply with lifting equipment design requirements.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
7、-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Facilitiesa71 Ground Operationsa71 Ground Equipmenta71 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-,-,-
