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OSO News and Announcement
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Article
Date: Tuesday, December 18, 2007
GOES-12 Returns to operations as GOES-East
GOES-12 returned to operations as the Eastern operational spacecraft at 1745UTC on Dec 17, 2007, following an attitude control subsystem anomaly which occurred during a scheduled North-South station keeping maneuver on Tuesday, December 4, 2007.
 The yearly GOES-12 North/South maneuver was initiated as scheduled on December 7, 2007. However, engineers were unable to return the spacecraft to normal mode upon completion of the maneuver. A “Tiger Team” was convened to investigate the anomaly and determine corrective actions. GOES-10 was transitioned from South America coverage to the GOES-East primary spacecraft at 1531UTC on Wednesday, December 5, 2007. Engineering investigation revealed that the GOES-12 anomaly was caused by a leak in an attitude thruster. The thruster was isolated and GOES-12 returned to normal attitude control mode on Friday, December 7, 2007. Due to the spacecraft thruster anomaly, GOES-12 was drifting east at around 0.44 degrees per day and as of the morning of Monday December 10, 2007, was located at 72.9 degrees West. On Tuesday, December 11, 2007 at 1146UTC, engineers performed a maneuver to move GOES-12 back to its nominal position of 75 degrees West. Following the maneuver, GOES-12 began a westward drift of 0.5 degrees per day. The GOES-12 Imager and Sounder startup commenced post maneuver on Tuesday, December 11. A GOES-12 East/West Station Keeping maneuver was performed on Monday, December 17, 2007 at 1217UTC to stop the westward drift at 75 degrees West. Following the maneuver, a nominal post maneuver image navigation recovery process was completed and GOES-12 returned to operations as the Eastern operational spacecraft. GOES-10 was then returned to South American operations.
Throughout this 14 day period, engineers, schedulers, and operations crews worked around the clock to continue to provide GOES East operational products, while also working to restore GOES-12. Their efforts resulted in minimal disruption of service and resulted in restoring GOES-12 to GOES-East operations and returning GOES-10 to South America operations.
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