ACE Weekly 04/13/2007 - 04/19/2007

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        04/19/2007
	DOY         109 2007
	Thrusters   2R 4R+ 4R-
	Duration    13:44 min
	Start       15:18:09z
	Stop        15:31:53z
	StartHGA    -5.83deg
	StopHGA     +7.01deg
	Firing      70 pulses
	FuelUsed    0.2292lbs
	FuelRemain  157.3448lbs
	FinalSCMass 1391.605lbs

The next attitude maneuver is scheduled for Wednesday, 05/09/2007.

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OCRs:

None

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Activities:

RIONET - String 2 conversion to the Restricted IONet has been postponed.  An
IT security waiver is required for the HPUX 10.2 operating system.  This
waiver was not approved.

Space Link Extension (SLE) - ACE SLE version 2.1 was delivered to the
Library on April 28, 2006.  Installation in the ACE MOC will not occur until
after the MOC is converted to the RIONET.

An evaluation is ongoing to replace the TPOCC mission software and
incorporate ACE operations into a multi-mission ops center.  A decision
between L3 INCNG and ITOS mission software is expected by the end of April.

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Anomalies:

DOY 106  04/16/2007  S-ACE-0167  G07-0026  DSS-24 Uplink Delayed
DSS-24 was unable to establish uplink due to a waveguide arc interlock.
Station maintenance replaced the Wave Guide Arc Detect assembly and the
station initiated uplink at 18:02:24z.  DR#G107670
IMPACT:  Activities delayed 50 minutes.

DOY 106  04/16/2007  S-ACE-0168  G07-0027  ROBOTT/C&C Froze
ROBOTT froze during the procedure S_OPS_PLBK_COMPLETE.  RTMON restart not
performed since less than 15 minutes before End of Track. CDSID#00021192
IMPACT:  This is a recurring issue that the ROBOTT developers are aware of.
Procedure G_ACEDOWN not performed.

DOY 107  04/17/2007  S-ACE-0169  G07-0028  Tape Drive Failure
Tape drive failed on string 3.  Tape drive was replaced by hardware
maintenance on same day.
IMPACT:  Minimal.  Backup delayed until tape drive was replaced.

DOY 108  04/18/2007  S-ACE-0170  G07-0029  ROBOTT/Cron Failure
The unix cron service terminated for unknown reasons.  The unix cron service
is used for starting and stopping the software for spacecraft passes.  The
unix cron service was restarted.
IMPACT:  If cron had not been restarted before the next pass, the Real-Time
Monitor would have started the software and notified the FOT.