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NOAA 11 ADACS Subsystem Summary

Component Description Status
ESAEarth Sensor AssemblyGreen
GYRO 1Gyroscopic Rate Measuring Device #1 -Yaw (X)Green
GYRO 2Gyroscopic Rate Measuring Device #2 -Roll (Y)Red
GYRO 3Gyroscopic Rate Measuring Device #3 -Pitch (Z)Red
GYRO 4Gyroscopic Rate Measuring Device #4 -Skew (S)Green
IMUInertial Measurement UnitGreen
PTC 1APitch Torque Coil 1AGreen
PTC 1BPitch Torque Coil 1BGreen
PTC 2APitch Torque Coil 2AGreen
PTC 2BPitch Torque Coil 2BGreen
RWA SSkew Reaction Wheel AssemblyGreen
RWA XX-axis Reaction Wheel AssemblyGreen
RWA YY-axis Reaction Wheel AssemblyGreen
RWA ZZ-axis Reaction Wheel AssemblyGreen
RYTC 1ARoll-Yaw Torque Coil 1AGreen
RYTC 1BRoll-Yaw Torque Coil 1bGreen
RYTC 2ARoll-Yaw Torque Coil 2AGreen
RYTC 2BRoll-Yaw Torque Coil 2BGreen
SSASun Sensor AssemblyGreen


Subsystem History:

Date Time Component Description
09/21/1990GYRO 3Z-gyro spin motor declared failed
09/03/1990GYRO 3Large yaw update of -0.956 degrees occurred due to Z-gyro spin motor failure
06/10/1990GYRO 3Pitch Gyro spin motor indicated a failed condition.
05/25/1990 ADACS control mode switched automously from nominal to Yaw Gyro Compassing (YGC) on six occasions.
09/19/1989GYRO 2Roll (Y-axis) Gyro spin motor failed.
04/13/1989 ADACS control mode switched autonomously from nominal to Yaw Gyro Compassing (YGC).
01/27/1989 ADACS control mode switched autonomously from nominal to Yaw Gyro Compassing (YGC).
09/24/198810:36:00GYRO 1
09/24/198810:36:00GYRO 1On Orbit
09/24/198810:36:00GYRO 2On Orbit
09/24/198810:36:00GYRO 3On Orbit
09/24/198810:36:00PTC 1AOn Orbit
09/24/198810:36:00PTC 1BOn Orbit
09/24/198810:36:00PTC 2BOn Orbit
09/24/198810:36:00PTC 2AOn Orbit
09/24/198810:36:00RWA SOn Orbit
09/24/198810:36:00RWA XOn Orbit
09/24/198810:36:00RWA YOn Orbit
09/24/198810:36:00RWA ZOn Orbit
09/24/198810:36:00RYTC 1AOn Orbit
09/24/198810:36:00RYTC 1BOn Orbit
09/24/198810:36:00RYTC 2AOn Orbit
09/24/198810:36:00RYTC 2BOn Orbit
09/24/198810:36:00SSAOn Orbit
09/24/198810:36:00GYRO 4On Orbit