Re: US Orientation Engine Fails On ISS

From: Mgr. CSc. Antonín Vítek (AVitek@seznam.cz)
Date: Fri Feb 11 2005 - 09:03:10 EST

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    OPf course - not engine, b ut gyroscope (CMG). Form more technically accurate description, see:
    
    http://www.spaceref.com/news/viewsr.html?pid=15390
    
    NASA Space Station On-Orbit Status 9 February 2005 
    
    <quote begin>
    
    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.] 
    
    <quote end>
    
    
    
    ================= Původní zpráva =================
    Od (From): "Kevin Fetter" <kfetter@yahoo.com>
    Komu (To): seesat-l@satobs.org
    Kopie (Cc): 
    Předmět (Subject): US Orientation Engine Fails On ISS
    Datum (Date): 11. 2. 2005 7:24
    ==================================================
    
    < http://www.spacedaily.com/news/iss-05r.html
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    < 
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    Mgr. Antonin Vitek, CSc.
    
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