Crews Work Together on Station, Shuttle

Russian Navigation Computers in Stable Condition

The Russian computers aboard the International Space Station are back in near normal, stable operation. Two of three channels of each computer are operating. A third channel is believed to be functioning well, but currently in standby.

The Mission Control Center in Moscow has restarted all Russian systems except the Elektron oxygen generation system, which has been powered but not yet started.

Flight controllers are planning to test Russian thrusters on Monday as they maneuver the station and Space Shuttle Atlantis to a water dump attitude.

The Russian navigation computers provide one method of backup attitude control and orbital altitude adjustments. The station’s control moment gyroscopes are the complex’s primary attitude control system. The shuttle’s propulsion system also provides a backup attitude control system for the complex.

The International Space Station’s new S3/S4 truss and solar arrays are viewed from Space Shuttle Atlantis’ robotic arm. Image credit: NASA TV

Image above: The International Space Station’s new S3/S4 truss and solar arrays are viewed from Space Shuttle Atlantis’ robotic arm. Image credit: NASA TV

The Expedition 15 and STS-117 crews continue to conduct joint operations aboard the International Space Station and Space Shuttle Atlantis.

Throughout the week, the two crews have been activating the Starboard 3 and 4 (S3/S4) truss segment that was attached to the station on Monday.

The STS-117 crew has conducted four spacewalks to prepare the new segment for activation and to retract arrays on the Port 6 (P6) truss. The P6 will be relocated from atop the station to the end of the Port 5 truss by a future shuttle crew.

The S3/S4, which is 45 feet long and weighs 35,678 pounds, contains a new set of solar arrays that will increase the station’s power-generation capabilities. The S3/S4 also contains a rotary joint that will allow its arrays to track the sun.

In addition to a new truss segment, NASA Astronaut Clayton Anderson joined the Expedition 15 crew on Sunday, replacing Flight Engineer Suni Williams. Anderson arrived at the station as a member of Space Shuttle Atlantis’ crew. Atlantis docked to the station on Sunday. Williams spent six months as an Expedition crew member.

STS-117 arrived at the station June 10 and is scheduled to undock June 19.

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