ACE Weekly 03/26/2008 - 04/01/2008

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Wednesday 04/16/2008.

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OCRs:

None

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Activities:

None

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Anomalies:

DOY 093  04/02/2008  S-ACE-0296  G08-0036  TPOCC/OS Bitbucket Error
The HPUX operating system occasionally returns a bitbucket error when the
TPOCC ground software executes a unix program.  The ROBOTT automation
software is designed to continue through the error.  Usually this is not a
problem, but on this occasion the procedure continued before the first
spacecraft command was verified.  The procedure attempted to build the next
2 commands, TPOCC generated more errors and ROBOTT continued through the
errors.  Manual intervention (with proper approval) was required to jump
back in the procedure and rebuild the 2 commands that were skipped.
IMPACT:  Manual intervention required to rebuild commands.  The procedure
would have remained paused until the proper commands had been sent.

DOY 093  04/02/2008  S-ACE-0297  G08-0037  DSS-66 TCP problems
Problems with the ground station TCP1 (Telemetry & Command Processor) 10MHz
reference signal prevented commands from being transmitted to the
spacecraft.  Station failed over to TCP2.  DR#M104747
IMPACT:  Activities delayed 18 minutes.

DOY 093  04/02/2008  S-ACE-0298  G08-0038  ROBOTT/C&C Failed to Resume
The automation ground software (ROBOTT/C&C) failed to resume after the
station TCP problems.  No notifications were sent.  This last occurred
06/11/2007 (DOY 162 AR#G07-0051).  FOT noticed the problem and manually
resumed ROBOTT.  CDSID#21191
IMPACT:  If ROBOTT had not been resumed, no further commanding would have
been performed.  The SSR playback would have completed, but redumps would
have been performed on the following pass.  The ground procedures have been
written to reduce the impact if the automation software is unable to
complete the support.

DOY 093  04/02/2008  S-ACE-0299  G08-0039  Excessive Network Loss
Network data loss was 1% for most of the pass with DSS-66 (1440-1625z).
Both JPL Comm and Goddard Comm Control were contacted, but neither group was
able to find any problems.
IMPACT:  All data available on CDR.  CDR verified before the beginning of
the next pass.

DOY 098  04/07/2008  S-ACE-0300  G08-0040  Excessive Network Loss
Network data loss was 1% during the pass with DSS-24 (1516-1521z and
1612-1649z).  Both JPL Comm and Goddard Comm Control were contacted, but
neither group was able to find any problems.  DR#G108502
IMPACT:  All data available on CDR.  CDR verified before the beginning of
the next pass.