[FPSPACE] Temporary loss of CMG on ISS

[Mgr. CSc. Antonín Vítek]

Not so perfect information at

http://www.spacedaily.com/news/iss-05r.html

Better info at URL:

http://www.spaceref.com/news/viewsr.html?pid=15390

NASA Space Station On-Orbit Status 9 February 2005 

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After yesterday s successful attitude transition to XPOP TEA (x-axis perpendicular to orbit plane/torque equilibrium attitude) at 10:47am EST and return of control authority to the U.S. CMGs (control moment gyroscopes) at ~11:07am, an incorrect ground command caused unexpected CMG saturation (~11:26am) and loss of AC (attitude control).  AC was taken over automatically by the Russian thrusters and later returned to CMG Momentum Management (~4:54pm).   [The excursion cost an estimated 14 kg of propellants on top of the 9 kg for the original maneuver to XPOP.] 

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Mgr. Antonin Vitek, CSc.

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