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.

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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.

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OCRs Executed:

NONE

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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.

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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.

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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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~