ACE Weekly 01/27/2010 - 02/02/2010

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver and
SK-53 are scheduled for Thursday 02/11/2010.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 024-031 2010


The start of operational testing in the MMOC is scheduled for Tuesday
02/16/2010 (DOY 047).  All passes starting with DOY 047 will be taken
from the MMOC.  If there are significant problems, operations would
switch back to the old MOC and DSN will be able to reload the
configuration tables for the next day's pass.  The Operations Readiness
Review (ORR) is scheduled for 03/31/2010.

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Anomalies:

DOY 029  01/29/2010  S-ACE-0480  G10-0003  AC2PC1 Hard Drive Failure
The AC2PC1 hard drive failed and is not expected to be recoverable.
AC2PC1 is used for attitude maneuver planning and ephemeris retrieval.
ACETLANPC is the backup.  With the upcoming transition to the MMOC,
there is no need to replace AC2PC1.
IMPACT:  Minimal.  AC2PC1 was last backed up in September 2009.  There
have been 10 attitude maneuvers since then.  The maneuver command sheets
(*.cmd) are saved in other places, but other files are not (*.lst,
*.pri, etc).  The other maneuver planning files are not currently used
for anything else, so there is no impact for having lost the past 10.

DOY 032  02/01/2010  S-ACE-0481  G10-0004  DSS-27 Receiver Problems
The ground station had difficulty locking onto the downlink after
establishing the uplink.  The station switched to a different DCC/RRP
(Downlink Channel Controller/Receiver & Ranging Processor) and was able
to lock onto the downlink.  DR#G109992
IMPACT:  Activities delayed 12 minutes.