SUMMARY: Engineers have nearly gotten to the bottom of the problem that forced spacewalkers to abort their trip outside the International Space Station last week. The primary oxygen bottle on Mike Fincke's Russian-built Orlan spacesuit lost pressure much more quickly than expected, so he and cosmonaut Gennady Padalka were ordered back in the station after only 14 minutes. Russian specialists are focusing on an injector switch that increases the flow of oxygen into the spacesuit. The crew should be able to repair the problem themselves, and use the suits when the spacewalk is rescheduled.

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