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ISS STATUS REPORT: SS07-08



SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468

Feb. 12, 2007

Allard Beutel
Headquarters, Washington
202-358-4769

Kyle Herring
Johnson Space Center, Houston 
281-483-5111 
STATUS REPORT: SS07-08

INTERNATIONAL SPACE STATION STATUS REPORT: SS07-08

HOUSTON - An unexpected circuit breaker trip early Sunday caused a 
power outage on the International Space Station. All systems were 
back up by Monday morning with no impact to operations on board. The 
safety of the Expedition 14 crew and the complex was never an issue. 

The first indications of a problem came with the loss of 
communications between the station and mission control just after 
12:00 a.m. CST Sunday when an electrical switching unit experienced a 
brief malfunction that appropriately caused a breaker to trip, 
protecting the electrical system of the station much like a circuit 
breaker protects electrical systems and equipment in a home. 

Expedition 14 Commander Mike Lopez-Alegria and Flight Engineers 
Mikhail Tyurin and Suni Williams - awake since mid-evening Saturday - 
took immediate action and followed procedures on board to recover the 
communications link with mission control, Houston, at about 1:35 a.m. 


During the remainder of Sunday and through early Monday, restoration 
of systems continued. The systems affected included: 



One of two redundant communications systems 

One of four gyroscopes used to maintain the station's position, or 
orientation 

Several scientific facilities, including the freezer containing 
experiment samples 

The Ku Band high data rate and television system 

Several smoke detectors and various heaters that maintain a thermal 
balance of external components, including the robotic arm and its 
mobile base 



None of these systems was permanently affected, and the equipment's 
temporary shut down did not impact research work or upcoming planned 
activities. 

In addition to the recovery from the power outage, the crew also began 
early preparations for the next spacewalk by Tyurin and 
Lopez-Alegria. During that spacewalk scheduled for Feb. 22, the two 
will free a stuck antenna on the ISS Progress 23 supply craft and 
survey navigation systems for the European Automated Transfer 
Vehicle's docking capability to the Zvezda Service Module. They will 
try to secure or remove the antenna to preclude any interference 
during undocking in April. The spacewalk will be the 10th for 
Lopez-Alegria, which will be a U.S. astronaut record. The two will 
wear Russian Orlan suits for the excursion out of the Pirs docking 
compartment. 



For more about the crew's activities and station sighting 
opportunities, visit: 

http://www.nasa.gov/station 

	
-end-

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