Re: US Orientation Engine Fails On ISS

From: Robert Holdsworth (
Date: Sat Feb 12 2005 - 04:41:43 EST

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    Here is NASA's report on it (from ISS station status report Number 7)::
    "After a successful preplanned attitude transition maneuver Tuesday, return 
    of attitude control was interrupted when one of the Control Moment 
    Gyroscopes (CMG) became saturated and lost its ability to control the 
    Station's orientation.
    Attitude control was automatically taken over by the Russian Attitude 
    Control System thrusters for about one orbit, using about 14 kilograms of 
    propellant. The CMG saturation was the result of an incorrect ground 
    command. The ground team recognized the source of the error and issued the 
    command to properly reposition the CMG. The CMGs then resumed control and 
    the thrusters were turned off. The crew's workday was unaffected by the 
    events. "
    ----- Original Message ----- 
    From: "Kevin Fetter" <>
    To: <>
    Sent: Friday, February 11, 2005 7:24 PM
    Subject: US Orientation Engine Fails On ISS
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