ACE Weekly 09/05/03 - 09/11/03 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was successfully executed on 09/08/03. The next attitude maneuver is scheduled for 09/16/03. ============================================================================ Orbit Events: ACE is currently in SEV transit through 09/23/03. Expected minimum SEV angle will be 1.76 degrees. The essential timeline based on a 30-min step scan for this 22 day, 8.5 hour event is: - SEZ entry (4.75 deg inbound) on Sept. 1 at 0100Z - Minimum Sun-Earth-ACE angle = 1.760 deg on Sept. 12 at 0800Z - SEZ exit (4.75 deg outbound) on Sept. 23 at 0930Z No problems have been encountered during this transit. ===================================================================== OCRs Executed: NONE ===================================================================== Ongoing Activities: TAPS: Trending, Analysis and Plotting System (TAPS) development continues with emphasis being placed on fixing the DRs attributed to prior releases. Release 4.1.7 was successfully installed on 09/09/03. The Final release (4.1.8) is tentatively scheduled for the week of 09/22/03. ---------------------------------------------------------------------------- Automation (ROBOTT): - Offline testing is progressing well on String 2. There are a few minor issues, but nothing that is keeping the system from running nominally. We expect to be finished testing this new release on String 2 by the end of September. - FOT currently training on the Automation system. - Automation Team testing of HSM and Command & Control on String 3 continues. C&C is shadowing passes and an expected delivery date to the FOT is 09/15/03. - The first draft of the SUG is expected to completed 10/01/03. ===================================================================== Anomalies: DOY 03248 (09/05/2003) ACE Anomaly G03-0082 - TPOCC Display Not Updating On AC1FE1A While running c_contingency_poke.prc, TPOCC displays (except the Event window) on AC1FE1A stopped updating. TPOCC still continued to process telemetry and commands for the rest of the pass. IMPACT: None. DOY 03249 (09/06/03) ACE Anomaly S03-0019 - Increase in SSR B SBE Count While scrolling through SSR B's 30 telemetry sections, the FOT noticed that the Single Bit Error Count (SBE_CT_B) had increased to 286. It had previously been 0 for the entire mission. The Scrub Error Count (Scrub_Err_Ct_B) remains at 0. The last time s_tlm_sections was performed was on 8/9/03, and no SBE's were detected then. IMPACT: Unknown. FOT will continue to monitor. DOY 03253 (09/10/2003) ACE Anomaly G03-0083 - SIMSS System Crashing Throughout the support with DSS-54, SIMSS crashed repeatedly. When the processes were checked on the ACETLAN-PC, JAVA was at 98-99% everytime a crash occurred. Every time SIMSS was configured for the pass an error message would state, "Write file failed - error code 122". With the display pages up and data updating, a check was made to see if the log file was updating - it wasn't. Moments later the system crashed. Only 2 log files had been opened throughout the day when there should have been at least 5 log files opened due to SIMSS being recycled 5 times. IMPACT: Unknown. FOT continues to investigate problem. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Glen A. Miller ACE Flight Operations Observatory Engineer Honeywell Technology Solutions Inc. Goddard Space Flight Center Building 14, Room W10A Mail Stop 428.2 Greenbelt, MD 20771 Office: 301-286-7071 Pager: 800-425-3174 Fax: 301-286-1729 Email: gamiller@pop500.gsfc.nasa.gov ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~