1、Lessons Learned Entry: 0156Lesson Info:a71 Lesson Number: 0156a71 Lesson Date: 1992-10-08a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Hydraulic Control Panels. Description of Driving Event: During MLP vehicle hydraulic power-up, trapped pressure between check valve A779
2、43 and supply valve A77900 could occur if the supply valve is not open. When pressure is locked up, the supply valve has to be opened using a pry bar, sometimes breaking the valve handles. This constitutes an unsafe condition and could result in injury to personnel.Lesson(s) Learned: The system was
3、designed with the check valve and supply valve incorrectly positioned resulting in pressure lock-up.Recommendation(s): Correct the design deficiency by repositioning the check valve to a location upstream of the supply valve.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesso
4、n: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 HardwareAdditional 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-,-,-
