ACE Weekly 01/06/06 - 01/12/06 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude Date 01/09/06 DOY 009 2006 Thrusters 2R 4R+ 4R- Duration 12:20 min Start Time 16:34:07z Stop Time 16:46:27z Start HGA 6.08 deg Stop HGA 6.11 deg Firing 63 pulses The next attitude maneuver is scheduled for Thursday 01/19/06. ============================================================================ OCRs: DOY 011 (01/11/06) 2024-2031z SIS-036 A couple of matrix detector strips were disabled recently (M1B HV strips # 26 & 35) but their firmware thresholds were not raised due to a limited number of available slots. This change will rearrange strips with raised firmware thresholds in order to optimize the performance of the instrument. ============================================================================ Ongoing Activities: Space Link Extension (SLE) - The first version of ACE SLE was delivered to the Library on December 14. The delivery to the ACE MOC will not be until late January/early February. RIONet - String 3 is anticipated to move to the RIONet in January. The firewalls in the TDF have been scanned, but there were security issues found during the scan. The RIONet firewall tests with DTF-21 have been postponed until the security issues are resolved. Attitude Training - The FOT continues training on attitude determination, maneuver planning, and maneuver execution. ============================================================================ Extra Activities: DOY 011 (01/11/06) - TELLTALE_CLEAR performed to clear autonomy bin fire flags after SSR failover. ============================================================================ Anomalies: DOY 006 (01/06/06) G06-0006 DSS-54 Transmitter problems Ground station unable to provide uplink due to low body flow. Station successfully resolved problem at 1317z. DR#M103544. IMPACT: Activities delayed 77 minutes. SSR playback unable to complete. Remaining playback data captured on following day. DOY 008 (01/08/06) G06-0007 DSS-16 Low XMTR Power + Incorrect CMD Mod Indx The uplink signal strength was poor (-25dB). The transmitter power was only 150Watts (-12dB) and the CMD Mod Index was too large (an additional -13dB). DR#N103341 IMPACT: All commands were successful, but the weak uplink generated several alarms. DOY 009 (01/09/06) G06-0008 DSS-27 Network data loss Network problems resulted in 30% data loss. Intermittent throughout the support and continuous from 1642-1726z. JPLComm successfully resolved problem at 1726z by removing problem lines. DR#N103338 IMPACT: All data available on CDR. DOY 009 (01/09/06) G06-0009 ROBOTT/C&C 2 procedures started ROBOTT started 2 procedures at the same time; C_SCIENCE/17:23:20 and S_OPS_PLBK_COMPLETE/17:23:23. C&C then froze and was restarted by RTMON. The initial instance of C&C was not properly terminated. The second instance of C&C determined that a string reboot was necessary since event server was responding slowly. String reboot completed at 25 minutes before End of Track. CDSID#21085 IMPACT: SWEPAM calibration not performed (later performed on DOY 011). Final state of health checks not performed. SSR redumps not completed (data available on CDR). DOY 009 (01/09/06) G06-0010 STOL syntax error WHILE block in S_AUTO_REDUMP was not executed due to lack of available time. TPOCC continued syntax checking as it searched for the end of the block (ENDDO). STOL directives formed by variable substitution generated syntax errors. ROBOTT continued the procedure after the syntax error and S_AUTO_REDUMP entered a continuous loop. MOCR#1230 IMPACT: Continuous executed until End of Track. DOY 010 (01/10/06) G06-0011 DSS-16 Red - No Pass, Microwave feed The pass with DSS-16 was lost due to a problem with the ground antenna microwave feed. Unable to schedule another support due to insufficient antenna time available (available time < 1hr). DR#G106422 IMPACT: No attitude determination for DOY 010. No clock calibration for DOY 009 & 010. SSR Failover on spacecraft (31 second gap in recording). DOY 011 (01/11/06) G06-0012 DSS-16 Red - No Pass, Transmitter DSS-16 was unable to provide uplink to the spacecraft. After 25 minutes of troubleshooting, FOT requested and obtained with a support with DSS-27. A second support with DSS-27 was scheduled and taken manually to recover SSR data after the failover. DR#G106428 IMPACT: Activities delayed 40 minutes. DOY 012 (01/12/06) G06-0013 ROBOTT/C&C Froze ROBOTT froze after procedure S_OPS_PLBK_COMPLETE completed (EOT-5minutes). RTMON restart not performed since 5 minutes before End of Track. CDSID#00021192 IMPACT: Procedure G_ACEDOWN not executed, status reports not completed before TPOCC terminated.