Date |
Time |
Component |
Description |
|
08/06/2007 | 18:49:00 | | Automatic thruster unloading enabled. |
|
08/31/2006 | 20:22:00 | | Return to nominal attitude control mode (from YGC). |
|
08/31/2006 | 20:21:00 | IMU | Disable ground IMU override. |
|
08/31/2006 | 20:20:00 | IMU | Set IMU override. |
|
08/31/2006 | 20:20:00 | GYRO 4 | When commanding spacecraft back to nominal mode, skew gyro was swapped OUT and X-Yaw gyro swapped back in. |
|
08/30/2006 | 02:46:00 | GYRO 4 | Autonomous switch to YGC mode also resulted in X-gyro (Yaw) being autonomously swapped out for the skew gyro. |
|
08/30/2006 | 02:45:00 | SSA | Sun sensor became shaded by the solar array during a yaw update which caused an excessive update value that caused an autonomous switch to YGC attitude control mode. |
|
06/01/2006 | 12:00:00 | RWA X | X-reaction wheel (yaw) recently began crossing below 0 RPM into negative speeds. When the speed/direction crosses through 0 RPM, the wheel sometimes sticks which can potentially impact yaw updates. |
|
04/06/2004 | 08:15:00 | | N12 flight GEODAT providing incorrect eclipse predictions inconsistent with ground GEODAT predictions. |
|
04/02/2004 | 14:05:00 | | Command spacecraft attitude control mode back to NOMINAL from YGC. |
|
04/01/2004 | 20:50:00 | | Excessive yaw update following software patch to re-enable yaw updates. Recovered after 4 orbits. |
|
04/01/2004 | 20:45:00 | | After patching flight software to re-enable Yaw updates a yaw update immediately occured with a bad value causing a 2 degree yaw error. |
|
10/02/2003 | 17:05:00 | GYRO 1 | Commanded yaw control back to orthogonal gyro-1(X) from skew gyro-4 (S). Restored yaw bais to previously known good value. |
|
09/12/2003 | 08:35:21 | GYRO 1 | Gyro-1 (orthogonal/yaw) autonomously DEselected because of switch to YGC mode |
|
09/12/2003 | 08:35:20 | GYRO 4 | Gyro-4 (skew) autonomously selected because of switch to YGC mode |
|
09/12/2003 | 08:35:19 | | Spacecraft autonomously swapped to YGC Attitude Control Mode. |
|
09/28/2002 | | | Expired Ephemeris caused attitude anomaly |
|
07/22/1998 | | | Correction to roll error loaded to spacecraft |
|
04/14/1998 | | | ADACS commanded to Nominal mode |
|
10/18/1997 | | | Several abrupt shifts in roll gyro rate output indicating shifts in spacecraft yaw position. |
|
08/22/1997 | | | ADACS mode switch to Yaw Gyro Compassing due to low sun angle |
|
02/13/1997 | | | Negative roll error of 0.339 degrees observed in AVHRR processed image . |
|
02/14/1995 | | | Yaw correction was loaded to correct yaw error in AVHRR. |
|
10/21/1992 | | GYRO 4 | Skew Gyro mean rate output changed erractically and continues unstable. Exercised self-tests to recover stablility. |
|
03/26/1992 | | | Yaw error of 0.4 degrees has been observed in AVHRR processed images during ADACS nominal control mode. |
|
05/14/1991 | 15:26:00 | ESA | On Orbit |
|
05/14/1991 | 15:26:00 | GYRO 1 | On Orbit |
|
05/14/1991 | 15:26:00 | GYRO 2 | On Orbit |
|
05/14/1991 | 15:26:00 | GYRO 3 | On Orbit |
|
05/14/1991 | 15:26:00 | IMU | On Orbit |
|
05/14/1991 | 15:26:00 | PTC 1A | On Orbit |
|
05/14/1991 | 15:26:00 | PTC 1B | On Orbit |
|
05/14/1991 | 15:26:00 | PTC 2B | On Orbit |
|
05/14/1991 | 15:26:00 | PTC 2A | On Orbit |
|
05/14/1991 | 15:26:00 | RWA S | On Orbit |
|
05/14/1991 | 15:26:00 | RWA X | On Orbit |
|
05/14/1991 | 15:26:00 | RWA Y | On Orbit |
|
05/14/1991 | 15:26:00 | RWA Z | On Orbit |
|
05/14/1991 | 15:26:00 | RYTC 1A | On Orbit |
|
05/14/1991 | 15:26:00 | RYTC 1B | On Orbit |
|
05/14/1991 | 15:26:00 | RYTC 2A | On Orbit |
|
05/14/1991 | 15:26:00 | RYTC 2B | On Orbit |
|
05/14/1991 | 15:26:00 | SSA | On Orbit |
|
05/14/1991 | 15:26:00 | GYRO 4 | On Orbit |