ACE Weekly 01/03/2012 - 1/09/2012

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Thursday 01/12/2012.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 001-008 2012

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Anomalies:

The "Ground Antenna Stop" problem was not listed in last week's report.

DOY 365  12/31/2012  S-ACE-0636  G11-0062  Ground Antenna Stop
DSS-27 antenna emergency stop was activated about 1 hour before End Of
Track.  Cause is unknown.  Tracking resumed within 10 minutes.
IMPACT: Minimal.  Data captured during redumps.

DOY 003  01/03/2012  S-ACE-0523  S10-0007  Increase in SBE_CT_B
SSR B Single Bit Error Count (SBE_CT_B) increased from 10995 to 11639
since last checked on DOY 355 (12/21/2011).  SBE_CT is tracked as a
measure of SSR health.
IMPACT:  Minimal.  Single Bit Errors are automatically corrected by the
SSR.  No non-correctable errors (Hard Single Bit Errors & Double Bit
Errors) have occurred throughout the mission.

	       SBE_CT_A  SBE_CT_B
	1999   15
	2000
	2001
	2002
	2003   270       286
	2004             858
	2005
	2006             2118
	2007   510       3238
	2008             4533
	2009   525       6839
	2010   780       7339
	2011             10995
	2012             11639

DOY 008  01/08/2012  S-ACE-0635  G11-0061  No Telemetry from MUS
The MMOC SLE software (Multi-User SLE, MUS) was not sending RT telemetry
to ITOS or ace_data_fwd.  This last occurred 12/25/2011.  MOCR 381 had
implemented a simple disconnect/connect for these situations, but that
did not fix the problem on this day.  MUS needed to be restarted.
IMPACT:  Manual intervention required.  Activities delayed 25 minutes.


A SLE/MUS problem occurs every few months.  But there have been SLE/MUS
problems for the past 3 weekends.  This is likely just a random
coincidence.  The MMOC is using MUS 3.0.  MUS 4.1 is undergoing testing
and may solve some of these problems.