ACE Weekly 03/19/2014 - 03/25/2014 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 03/25/2014 DOY 084 2014 Thrusters 2R 4R+ 4R- Duration 9:54 min Start 20:37:38z Stop 20:47:32z HGAStart -8.42 deg HGAStop +8.82 deg SunStart 15.61 deg SunStop 12.46 deg SpinStart 4.9846 rpm SpinStop 4.9867 rpm Nutation 0.16 deg Firing 50 pulses FuelUsed 0.1586 lbm FuelRemain 108.0724 lbm FinalSCMass 1342.333 lbm The next attitude maneuver is scheduled for Tuesday 04/02/2014. ======================================================================== OCRs: DOY 080 (03/21/2014) 1357z SWX-038 1 cmd Set adc_trigger=4 The SWICS instrument team set the trigger mode to 4. Background: The SWICS instrument has been in TOF trigger mode (adc_trigger=12) for most of the mission. When the TOF discriminator circuit starting firing continuously (8/23/2011), the instrument team investigated other trigger modes. This OCR command returns the instrument to the trigger mode tested on 10/24/2011. previously sbcsetatrig adc_trigger=12 TOF only 09/07/2011 testing calibration triggers 09/15/2011 sbcsetatrig adc_trigger=12 TOF only 09/16/2011 sbcsetatrig adc_trigger=10 Energy only/calibration 10/20/2011 sbcsetatrig adc_trigger=0 10/24/2011 sbcsetatrig adc_trigger=4 10/25/2011 sbcsetatrig adc_trigger=8 Energy only 05/31/2012 sbcsetatrig adc_trigger=12 TOF only 03/21/2014 sbcsetatrig adc_trigger=4 ======================================================================== Activities: Data Capture: 100% DOY 075-082 2014 The Near Earth Network continues to perform range tests in order to analyze the Doppler bias with the Flight Dynamics Facility. 03/20/2014 079 1410-1540 AGO 9m The FOT deleted DSN passes on 3/20/2014 and 3/22/2014 to help Juno recover from safemode. Time was acquired with the Near Earth Network's WS1 antenna on both days. ======================================================================== Anomalies: DOY 077 03/18/2014 S-ACE-0676 G14-0004 MMOCOPS3P Disk Drive Error The mmocops3p hard drive was generating disk errors which prevented users from logging in. The System Administrators replaced the hard drive. IMPACT: Minimal. The computer is one of 2 redundant workstations for the "GMSEC bus". Complete failure of the GMSEC bus would only impact the FOT notifications. Disk drive failures in the MMOC 03/18/2014 mmocops3p hard drive failure 01/13/2014 another drive failure in backup NAS RAID 12/15/2013 mmocops1b hard drive failure 11/22/2013 2 drives failed in backup NAS RAID 02/28/2013 mmocops3b hard drive failure DOY 078 03/19/2014 S-ACE-0635 G11-0061 MUS RT crash The MMOC SLE software (Multi-User SLE, MUS) that was connected to real-time data crashed 2 minutes after Beginning of Track (1312z). The software was restarted at 1331z. The last occurrence of a MUS RT problem was 11/08/2013. IMPACT: Manual intervention required. Activities delayed 20 minutes. SSR playback recovered over 2 days due to short passes. DOY 082 03/23/2014 S-ACE-0678 G14-0006 DSS-24 Transmitter Problems DSN station experienced alarms which suspended the transmitter (2057z). The station restored uplink within 28 minutes (2125z). Note, DSN transmitter problems require the MMOC to reconnect the SLE network connection. The MMOC software does this automatically. The DSN station, however, requested that the MMOC not reconnect during the transmitter down-time, which required manual intervention. IMPACT: Activities delayed 28 minutes. SSR playback recovered at the end of this pass.