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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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