Headlines > News > Cause of Station False Alarm Diagnosed

Cause of Station False Alarm Diagnosed

Published by Klaus Schmidt on Sat Mar 5, 2011 9:42 am via: NASA
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After a false smoke alarm, station Commander Scott Kelly used a compound specific analyzer to sample air in the Russian Pirs docking compartment. Kelly reported readings on the instrument were zero detecting no fire, no smoke and no odor.

Russian flight controllers have diagnosed the cause of the false smoke alarm that was triggered in the Pirs docking compartment earlier this morning. The sensor had previously been inhibited after proving to be overly-sensitive to dust particles. There are other sensors in the area that perform normally, however this particular sensor has a history of causing similar false alarms.

When Russian flight controllers rebooted the Zvezda service module central computers, all the sensors were reactivated, including the one that had previously been inhibited. It once again caused a false alarm and has since been re-inhibited.

President Obama Calls International Space Station

President Barack Obama made a long-distance call to the dozen members of the Discovery and International Space Station crews a little after 5 p.m. EST Thursday.

“We are always inspired by the images of you guys at work as you work to put some of the final pieces in place to make the ISS fully operational,” Obama told the space fliers, traveling five miles a second 221 miles above the Earth. “You are setting such a great example with your dedication, your courage, your commitment to exploration.”

The crew members also discussed with the president the delivery of the humanoid Robonaut 2 and international cooperation, exhibited by the presence of vehicles and components from all of the program’s partners.

Space shuttle and International Space Station managers decided Thursday to extend the STS-133 mission by an additional day, providing more time for the shuttle crew to help unpack and outfit the Leonardo Permanent Multipurpose Module and fill the Japanese Kounotori2 H-II Transfer Vehicle with trash before its planned late-March undocking. Discovery’s landing is now scheduled for 11:58 a.m. Wednesday.

The crews’ day included continued transfer of equipment and supplies between the station and shuttle, stowage of spacewalk equipment, exercise and maintenance. Shuttle Commander Steve Lindsey and Pilot Eric Boe were on the flight deck for a morning reboost of the docked spacecraft. The 26-minute firing of Discovery’s small attitude control jets raised the orbit by about a mile.

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