scope:

Description of Driving Event:

 Prior to being operated at KSC, SKYLAB hydraulic systems were tested for contamination. 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 in 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 compatible 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 Sources: MSFC Documentation of Significant SKYLAB Experiences, Dated 15 Nov 1973