1、Lessons Learned Entry: 0244Lesson Info:a71 Lesson Number: 0244a71 Lesson Date: 1993-01-14a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Water System Contamination Description of Driving Event: Prior to being operated at KSC, SKYLAB hydraulic systems were tested for contam
2、ination. If the systems were found to be clean, they were sealed and not retested. After being operated at KSC, a water system pump failed. A new pump was installed and a fluid sample was taken from the failed pump. Analysis of the fluid sample showed gross contamination. It can also be noted that i
3、n following missions, water system pumps failed repeatedly, all due to contamination. Fluid system cleanliness levels were not maintained throughout assembly operations. Plumbing, component, or installation cleaning procedures resulted in cleaning to dissimilar specifications, which were not compati
4、ble with various hardware. Component tolerances should be such as to allow particulate contamination of specification levels to pass without failing the component. Filtration, with a filter change-out capability after demonstrated life, should be placed in the system to collect particles.Additional
5、Sources: MSFC Documentation of Significant SKYLAB Experiences, Dated 15 Nov 1973Lesson(s) Learned: Incompatibilities between SKYLAB system design and cleanliness levels caused particulate contamination, resulting in repeated water pump failures.Recommendation(s): Establish individual system cleaning
6、 techniques to assure system status after final servicing and install filters with change-out capability.Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Director
7、ate(s): N/AAdditional Key Phrase(s): a71 Flight Equipmenta71 Hardwarea71 Launch Vehiclea71 Parts Materials & Processesa71 SpacecraftAdditional 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-,-,-
