ACE Weekly 04/30/2008 - 05/06/2008 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude Date 05/05/2008 DOY 126 2008 Thrusters 2R 4R+ 4R- Duration 13:53 min Start 16:28:13z Stop 16:42:06z HGAStart -6.71deg HGAStop +8.05deg SunStart 15.41deg SunStop 4.38deg Nutation 0.49deg Firing 71 pulses FuelUsed 0.2282lbs FuelRemain 150.3524lbs FinalSCMass 1384.613lbs The next attitude maneuver and Station-Keeping #48 are scheduled for Tuesday 05/20/2008. =========================================================================== OCRs: DOY 126 (05/05/2008) 1454-1459z SC_08_001 Blind Commanding Problems with JPL's IONet router had prevented telemetry from reaching the MOC from DOY 124 to DOY 126. The SSRs would have stopped recording data on DOY 127 0400z. To prevent this, the playback was initiated with blind commanding. A temporary procedure (doy126_2008.prc) was created to start the playback and re-enable the SSR failover. ============================================================================ Activities: None ============================================================================ Anomalies: DOY 121 04/30/2008 S-ACE-0309 G08-0048 Network Loss From 2145-2308z, received 0.1% data loss due to the network. The data loss was resolved when DSS-34 was switched from DC5 to DC4. DR#C106364 IMPACT: All data available on CDR. DOY 123 05/02/2008 S-ACE-0310 G08-0049 Duplicate Data on TAPS During the transition from the Closed IONet fanout to the Restricted IONet GMUG, the ACE MOC configured TAPS to listen to both the prime GMUG and the backup GMUG. Starting on DOY 077 2008, both GMUGs were flowing ACE telemetry resulting in twice as much data stored on TAPS. TAPS has been re-configured to listen only the prime GMUG. IMPACT: TAPS unable to create certain plots until data storage issue was fixed. DOY 124 05/03/2008 S-ACE-0311 G08-0050 Telemetry Not Received at GSFC A network problem caused only three frames of telemetry data to reach the ACE MOC from DSS-66. JPL Comm and Goddard Comm Control were unable to resolve the problem. The MOC automation software (ROBOTT) is designed to command only when telemetry is online in order to perform state-of-health checks. Low-rate data recorded at DSN CDR. DR#M104817 IMPACT: No commanding performed. SSR playback not started. DOY 124 05/03/2008 S-ACE-0312 G08-0051 Telemetry Not Received at GSFC After the network problems (AR#G08-0050), an additional pass was scheduled with DSS-34. The same network problem caused only one frame of telemetry data to reach the ACE MOC. JPL Comm and Goddard Comm Control were unable to resolve the problem. The MOC automation software (ROBOTT) is designed to command only when telemetry is online in order to perform state-of-health checks. Low-rate data recorded at DSN CDR. DR#N104851 IMPACT: No commanding performed. SSR playback not started. SSR failover occurred at 0500z DOY 125. DOY 125 05/04/2008 S-ACE-0313 G08-0052 Telemetry Not Received at GSFC The same network problem caused only one frame of telemetry data to reach the ACE MOC from DSS-27. JPL Comm and Goddard Comm Control were unable to resolve the problem. The MOC automation software (ROBOTT) is designed to command only when telemetry is online in order to perform state-of-health checks. Low-rate data recorded at DSN CDR. DR#N104852 IMPACT: No commanding performed. SSR playback not started. DOY 126 05/05/2008 S-ACE-0314 G08-0053 Telemetry Not Received at GSFC The same network problem caused only one frame of telemetry data to reach the ACE MOC from DSS-27. After an hour, blind commanding was approved to start the playback (OCR SC_08_001). Blind commanding was performed at 1454z. At 1458z, the network problem was resolved. The problem was an IONet router at JPL. DR#N104855 IMPACT: Activities delayed 1 hour 20 minutes. DOY 126 05/05/2008 S-ACE-0315 G08-0054 ROBOTT/C&C Froze At 2021z, The ACE MOC automation software (ROBOTT/C&C) froze for unknown reasons. The Real-Time Monitor restarted the software, including TPOCC, at 2052z. IMPACT: Minimal. No commanding was needed during the 30 minutes. DOY 126 05/05/2008 S-ACE-0316 G08-0055 TPOCC did not reconnect to SLE After the ROBOTT restart (AR#G08-0054), the FOT procedures did not reconnect SLE. The FOT procedures will be updated to handle this contingency. IMPACT: Minimal. The commands to perform the final state-of-health checks (g_end_day.prc) were not performed.