NOAA Office of Satellite and Product Operations

NOAA 17 ADACS Subsystem Summary

Component Status:

Component
Description
Status
GYRO 1Gyroscopic Rate Measuring Device #1 (YA, ZA)Green
GYRO 2Gyroscopic Rate Measuring Device #2 (XA, ZB)Orange
GYRO 3Gyroscopic Rate Measuring Device #3 (XB, YB)Yellow
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
03/20/201317:22:25 Configure spacecraft for firing roll/yaw thrusters (5-8) for 20 seconds. Performed 4 thruster firings of 10 seconds.
03/20/201315:42:00 Configure spacecraft for firing roll/yaw thrusters (5-8) for 10 seconds. Performed 2 thruster firings of 10 seconds.
03/15/201317:41:26 Configure spacecraft for firing roll/yaw thrusters (5-8) for 20 seconds. Performed 1 thruster firing of 20 seconds.
03/15/201316:00:29 Configure spacecraft for firing roll/yaw thrusters (5-8) for 10 seconds. Performed 2 thruster firings of 10 seconds.
03/15/201312:45:21 Configure spacecraft for firing roll/yaw thrusters (5-8) for 5 seconds. Performed 2 thruster firings of 5 seconds.
03/15/201312:41:55 Configure spacecraft for firing roll/yaw thrusters (5-8) for 2 seconds. Performed 3 thruster firings of 2 seconds.
03/14/201319:45:12 Configure spacecraft for firing roll/yaw thrusters (5-8) for 5 seconds. Performed 3 thruster firings of 5 seconds.
03/14/201316:23:44 Configure spacecraft for firing roll/yaw thrusters (5-8) for 5 seconds. Performed 4 thruster firings of 5 seconds.
03/14/201314:39:18 Configure spacecraft for firing roll/yaw thrusters (5-8) for 5 seconds. Performed one thruster firings of 5 seconds.
03/14/201313:08:08 Configure spacecraft for firing roll/yaw thrusters (5-8) for 5 seconds. Performed two thruster firings of 5 seconds.
03/13/201318:28:40 Configure spacecraft for firing roll/yaw thrusters (5-8) for 2 seconds. Performed four thruster firings of 2 seconds.
03/13/201316:47:36 Configure spacecraft for firing roll/yaw thrusters (5-8) for 2 seconds. Performed four thruster firings of 2 seconds.
03/13/201315:04:48 Configure spacecraft for firing roll/yaw thrusters (5-8) for 2 seconds. Performed two thruster firings of 2 seconds.
03/13/201313:30:34 Configure spacecraft for firing roll/yaw thrusters (5-8) for 2 seconds. Performed two thruster firings of 2 seconds.
03/12/201318:52:08 Configure spacecraft for firing roll/yaw thrusters (5-8) for 1.5 seconds. Performed two thruster firings of 1.5 seconds.
03/12/201315:29:35 Configure spacecraft for firing roll/yaw thrusters (5-8) for 1 second. Performed three thruster firings of 1 second.
03/11/201317:34:52 Configure spacecraft for firing roll/yaw thrusters (5-8) for 1 second. Performed three thruster firings of 1 second.
03/11/201317:34:52 Configure spacecraft for firing roll/yaw thrusters (5-8) for 1 second.
03/11/201315:54:41 Configure spacecraft for firing roll/yaw thrusters (5-8) for 1 second.
03/11/201315:54:41 Configure spacecraft for firing roll/yaw thrusters (5-8) for 1 second. Performed two thruster firings of 1 second.
03/07/201315:44:45 Restart macros that activates Macro 1B for yaw bias clear
03/07/201315:42:11 End GYROLESS test
02/26/201315:57:08 Start GYROLESS test
01/10/201321:13:16 Configure spacecraft for manual thruster firing: 5678 (thrust neutral firing for 1 second)
01/10/201317:56:11 Configure spacecraft for thruster firing: 5678 (thrust neutral firing for 0.5 second)
01/10/201317:51:51 Configure spacecraft for thruster firing: 5678 (thrust neutral firing for 0.5 second)
01/10/201314:32:44 Configure spacecraft for manual thruster firing: 6 & 8 (thrust neutral firing for 0.1 second)
01/10/201313:04:26 Configure spacecraft for manual thruster firing: 6 & 8 (thrust neutral firing for 0.1 second)
01/10/201313:00:08 Configure spacecraft for manual thruster firing: 5 & 7 (thrust neutral firing for 0.1 second)
07/25/201213:02:39GYRO 2Loss of 3 axes gyro control. Remaining Gyro 1 provides roll and pitch rate and ACS now uses the roll rate to estimate yaw error and yaw rate. ACS mode is now in RGYO estimate yaw.
07/25/201213:02:39 Inhibit IMU switching; Reduced gyro mode to 2;
07/25/201212:59:14 Disable Thrusters
07/24/201216:38:15 Pitch Wheel Bias set to 2500 RPM to enhance RGYRO performance (Control SCP)
07/24/201216:37:20 Pitch Wheel Bias set to 2500 RPM to enhance RGYRO performance (Non-Control SCP)
11/11/200809:50:00 Clears gyro consistency flags.
11/04/200822:51:00 Clears gyro consistency flags.
11/04/200819:26:30 On Tuesday (Nov 8, 2008) afternoon the AET called observed a Z axis gyro consistency miscompare. Investigation revealed that the consistency flag was set when SADBIAS slewed the solar array.
07/17/200718:53:00 There was large (.74deg) pitch error. It was quickly damped out by the wheels. The total spacecraft momentum changed from 30 to 15 lb/sq in. The spacecraft recovered in ~3-4 minutes.
04/05/200622:30:00GYRO 2Small phase shift in gyro 2. Current (drop of 2 mA) accompanied by increase in TCA voltage, which is unexpected. Returned to previous equilibrium 48 hours later accompanied by a drop in TCA voltage (also unexpected).
04/05/200622:29:00GYRO 1Small phase shift in gyro 1. Current (drop of 2 mA) accompanied by increase in TCA voltage, which is unexpected. Returned to previous equilibrium 48 hours later accompanied by a drop in TCA voltage (also unexpected).
02/16/200619:23:00 Change N2 gas unloading trigger on pitch axis momentum to 45 in/lb/sec (from 40) absolute. Control side.
02/16/200619:21:00 Change N2 gas unloading trigger for pitch axis momentum to 45 in/lb/sec (from 40) absolute.
12/16/200518:02:00 Change configuration to monitor thruster telemetry
12/16/200518:01:00 Enable N2 thrusters to enhance spacecraft recovery response to additional potential attitude perturbations caused by possible hydrazine thruster leakage.
12/16/200512:00:00 Spacecraft attitude perturbations now thought to be caused by leaky or anomalous hydrazine thruster components (REA #2 for the first incident on J324 and REA #4 for the incident on J342).
12/08/200501:21:00 Spacecraft attitude perturbation along X (yaw) and Y (roll) axis' with momentum reversals in each axis. Similar to previous perturbation (collision) on 20 Nov but of significantly less magnitude (yaw error of approx 0.9 deg vs previous 10 degs) and affecting roll axis this time vs pitch the previous time with no autonomous hardware swaps. Errors damped out quickly and nominal attitude restored.
11/20/200516:24:00 Select primary RY coil (#1) Deselect backup coil (#2)
11/14/200510:31:00RYTC 1ARoll-Yaw coil #1 autonomously swapped to #2 after excess momentum remained following an unloading. Significant increase in RWheel speeds and temps and momentum on all 3 axis. Suspect Leonid meteorite strike. Nominal attitude regained 15 minutes later.
06/16/200507:52:45GYRO 2Gyro-2 spin motor current surged 10 mAmps then stabilzed at this new higher level. No obvious lasting impact to other attitude control components or values.
06/10/200415:40:00GYRO 3Power off Gyro-3 permanently. Place RGyro Mode to MONITOR.
06/09/200412:00:01GYRO 3Downgrade color status to YELLOW because of continued degradation of Gyro-3.
03/25/200414:50:00 Change gyro channel selection assignments to Gyro#1: Y axis (Roll) Channel-A, Gyro#2: X axis (Yaw) Channel-A and Z axis (Pitch) Channel-B. Deselect Gyro #3.
03/15/200400:00:01GYRO 3Trend towards excessive yaw updates (up to 0.4 deg) detected since mid Feb 04. Possible gyro-3 problem. Under investigation.
06/02/200320:02:00RWA STurn OFF power to Skew wheel
06/02/200320:02:00RWA XTurnon power to X Reaction Wheel
06/01/200320:24:00 Command spacecraft back to normal attitude mode
06/01/200315:03:58RWA XAutonomous switch to S wheel from X wheel.
05/30/200314:34:00 Command spacecraft attitude to YGC mode.
06/28/200212:26:00 ADACS to normal mode (from YGC)
06/24/200218:56:00RWA XOn Orbit
06/24/200218:56:00GYRO 1On Orbit
06/24/200218:56:00GYRO 2On Orbit
06/24/200218:56:00GYRO 3On Orbit
06/24/200218:56:00IMUOn Orbit
06/24/200218:56:00PTC 1AOn Orbit
06/24/200218:56:00PTC 1BOn Orbit
06/24/200218:56:00PTC 2BOn Orbit
06/24/200218:56:00RWA SOn Orbit
06/24/200218:56:00RWA YOn Orbit
06/24/200218:56:00RWA ZOn Orbit
06/24/200218:56:00RYTC 1AOn Orbit
06/24/200218:56:00RYTC 1BOn Orbit
06/24/200218:56:00RYTC 2AOn Orbit
06/24/200218:56:00RYTC 2BOn Orbit
06/24/200218:56:00SSAOn Orbit
06/24/200218:56:00ESAOn Orbit
06/24/200218:56:00PTC 2AOn Orbit