NOAA 15 ADACS Subsystem Summary

Component	Description	Status
ESA		Green
GYRO 1	Gyroscopic Rate Measuring Device #1 (YA, ZA)	Green
GYRO 2	Gyroscopic Rate Measuring Device #2 (XA, ZB)	Orange
GYRO 3	Gyroscopic Rate Measuring Device #3 (XB, YB)	Yellow
IMU	Inertial Measurement Unit	Green
PTC 1A	Pitch Torque Coil 1A	Green
PTC 1B	Pitch Torque Coil 1B	Green
PTC 2A	Pitch Torque Coil 2A	Green
PTC 2B	Pitch Torque Coil 2B	Green
RWA S	Skew Reaction Wheel Assembly	Green
RWA X	X-axis Reaction Wheel Assembly	Green
RWA Y	Y-axis Reaction Wheel Assembly	Green
RWA Z	Z-axis Reaction Wheel Assembly	Green
RYTC 1A	Roll-Yaw Torque Coil 1A	Green
RYTC 1B	Roll-Yaw Torque Coil 1b	Green
RYTC 2A	Roll-Yaw Torque Coil 2A	Green
RYTC 2B	Roll-Yaw Torque Coil 2B	Green
SSA	Sun Sensor Assembly	Green

Subsystem History:

Date	Time	Component	Description
08/11/2014	20:30:00		Clear Consistency Flag
01/25/2012	19:53:53		End GYROLESS test
01/24/2012	18:53:14		Start GYROLESS test
11/30/2011	20:49:52		End GYROLESS test
11/29/2011	14:49:10		Start GYROLESS test
03/15/2010	16:53:06		Set RYC to use primary coil
03/11/2010	19:51:30		Pitch Wheel Bias set to 2500 RPM to enhance RGYRO performance (Non-Control SCP)
03/11/2010	19:51:00	GYRO 2	Pitch Wheel Bias set to 2500 RPM to enhance RGYRO performance (Non-Control SCP)
03/11/2010	01:41:16		Pitch Coil Swap to Back-up
03/11/2010	01:28:36	RWA Z	Pitch Wheel Bias set to 1300 RPM to enhance RGYRO performance (Control SCP)
03/11/2010	01:25:55	RWA Z	Pitch Wheel Bias set to 1300 RPM (Non-Control SCP)
03/10/2010	23:49:54		Reduced gyro estimate X, #2 Gryo Off
03/10/2010	23:47:29		Disable Thrusters
03/08/2010	01:45:56		automatic switch to YGC
06/04/2009	17:08:00		Enables Auto Thruster Firings for both CPUs
06/04/2009	17:07:00		Change gas unloading threshold for pitch axis momentum from 40 in/lbs/sec to 45 in/lbs/sec for both CPUs
06/30/2006	12:00:00	RWA Z	Z-reaction wheel transition toward positive values reversed. Trending back toward negative values. Wheel continues sticking as it passes through 0 RPM.
06/17/2006	12:00:00	RWA Z	Whenever the Z-wheel speed passes through 0 RPM, in either direction, the wheel sticks for up to several minutes impacting pitch precision. Expect transition to full positive values on or about 5 Jul 06.
06/01/2006	12:00:00	RWA Z	Z-reaction wheel (pitch) transitioning from a negative direction to a positive direction (for the first time ever). Pitch torquer coil intervention no longer required.
06/03/2004	18:25:00		Revised Mag. torquer constants to non control SCP
04/22/2004	18:20:00		Reduced gyro testing completed. Estimating all 3 axis successfully tested.
04/22/2004	16:45:00		Command ADACS to nominal mode.
04/22/2004	16:40:00		Ends estimate yaw-pitch test
04/22/2004	13:20:00		Ends estimate yaw test
04/22/2004	13:20:00		Preparatory commands for Yaw-Pitch estimate Rgyro test.
04/21/2004	12:03:00		Preparatory commands for Yaw Estimate Rgyro test
04/20/2004	23:46:00		Ends roll-pitch test
04/20/2004	22:05:00		Preparatory commands for Roll-Pitch estimate Rgyro test
04/20/2004	17:25:00		End estimate roll test
04/19/2004	22:30:00		Ends estimate pitch test
04/19/2004	16:05:00		Preparatory commands for pitch estimate and roll estimate Rgyro tests
04/19/2004	16:00:00		Start Reduced gyro testing series. Pointing precision during testing may be impacted. Testing is day shift (eastern time) 19, 20 and 22 Apr. 24 hour test on 21 Apr.
10/15/2003	19:40:00		Command N15 back to NOMINAL attitude control mode, test complete.
10/15/2003	16:15:00		Command N15 to YGC mode for baseline performance test.
03/15/2002	20:00:00	GYRO 3	Gyro 3 Turned OFF- test complete
03/11/2002	16:45:00	GYRO 3	Gyro 3 Turned ON for data gathering purposes
10/10/2001	16:45:00		Placed spacecraft back into normal ADACS mode
10/09/2001	13:51:00		Forced spacecraft into YGC mode
06/26/2000		GYRO 3	Gyro 3 powered off because of erratic readouts.
05/13/1998	16:24:00	ESA	On Orbit
05/13/1998	16:24:00	GYRO 1	On Orbit
05/13/1998	16:24:00	GYRO 2	On Orbit
05/13/1998	16:24:00	GYRO 3	On Orbit
05/13/1998	16:24:00	IMU	On Orbit
05/13/1998	16:24:00	PTC 1A	On Orbit
05/13/1998	16:24:00	PTC 1B	On Orbit
05/13/1998	16:24:00	PTC 2B	On Orbit
05/13/1998	16:24:00	PTC 2A	On Orbit
05/13/1998	16:24:00	RWA S	On Orbit
05/13/1998	16:24:00	RWA X	On Orbit
05/13/1998	16:24:00	RWA Y	On Orbit
05/13/1998	16:24:00	RWA Z	On Orbit
05/13/1998	16:24:00	RYTC 1A	On Orbit
05/13/1998	16:24:00	RYTC 1B	On Orbit
05/13/1998	16:24:00	RYTC 2A	On Orbit
05/13/1998	16:24:00	RYTC 2B	On Orbit
05/13/1998	16:24:00	SSA	On Orbit