US and Russian Segments "No Go" for EVAs
NASA Space Station On-Orbit Status 15 March 2006
“Both the Russian segment (RS) and the US segment (USOS) are currently “No Go” for EVA (extravehicular activity): the RS side is still missing four Orlan LiOH (lithium hydroxide) CO2 absorption canisters; on the US side, of surface blisters observed on “dogbone”-type EVA handrails on ground units which may also be present on orbit.[For the LiOH cans, additional crew time will be allocated for the search. On the handrails, an ongoing metallurgy analysis/testing (tensile, fracture, sheer) will be completed prior to a spacewalk if a contingency arose).]”