1、Lessons Learned Entry: 0113Lesson Info:a71 Lesson Number: 0113a71 Lesson Date: 1992-08-25a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Space Shuttle Main Engine (SSME) Vertical Installer Description of Driving Event: The SSME vertical installer is used to position the en
2、gine for installation and removal. Failure of this equipment to maintain positive control could lead to unexpected movement. During visual inspection of the air piston and bore of the vertical installer, it was discovered that the air piston had a scored landring. This condition occurs when the pist
3、on sticks in the cylinder (due to lack of lubrication and/or foreign material in the cylinder). Pressure then builds up until the piston breaks free. When the piston breaks free it can travel to the stops with enough momentum to cause sudden uncontrolled movement of the engine.Lesson(s) Learned: Lac
4、k of a preventative maintenance program for the vertical installer resulted in failure of the installer to maintain control over the SSME.Recommendation(s): Develop and implement a preventative maintenance program for the SSME vertical installer.Evidence of Recurrence Control Effectiveness: N/ADocum
5、ents Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71 Lifting Devicesa71 Policy & PlanningAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 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-,-,-
