1、Lessons Learned Entry: 0086Lesson Info:a71 Lesson Number: 0086a71 Lesson Date: 1992-06-15a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Maintenance of Environmental Control System (ECS) fans Description of Driving Event: The fans are located on the 107 foot level of the r
2、otating service structure (RSS) and controlled from the computer console for ECS in the PTCR. The circuit breakers providing power to the fans are located in the hoist room on the 207 foot level of the RSS; therefore, there is no local control. When maintenance personnel are working on the fans, it
3、is possible that someone could re-apply power to them. Also, if local switches were located immediately outside the locked fan rooms, should a problem arise with the fans that generated excessive noise, smoke, etc. They could be shut down by personnel and reduce damage.Lesson(s) Learned: Inadvertent
4、 actuation of ECS fans S1 and S2 at the payload changeout room (PCR) during maintenance will cause injury or death of personnel.Recommendation(s): Add a requirement to the operations instruction manual requiring the technicians to lock out electrical power prior to beginning maintenance.Evidence of
5、Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Energya71 Facilitiesa71 Hardwarea71 Industrial Operationsa71 Safety & Mission AssuranceAdditional 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-,-,-
