ACE Weekly 02/21/03 - 02/27/03

All ACE spacecraft subsystems are performing nominally. An attitude 
maneuver was performed on 02/24/03 successfully. The next attitude maneuver 
is scheduled for 03/04/03.

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Orbit Event:

SEV Transit
On 03/06/03, at 1754Z, ACE will begin a Solar Exclusion Zone (SEV) transit 
that will conclude on 03/20/03 at 1518Z.  The minimum SEZ angle of 2.68 
degrees will occur on 03/15/03 at 2326Z.

NOTE:  Be advised that telemetry dropouts may occur during this time period.

The next expected SEV transit is to occur:

Entry: 06/01/03 at 1442Z
Minimum angle: 2.18 degrees on 06/13/03 at 1618Z
Exit: 06/25/03 at 1652Z

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OCRs Executed:

NONE

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Ongoing Activities:

TAPS:
Trending, Analysis and Plotting System (TAPS) development continues. TAPS 
Patch 4.1.1. was installed on TAPS #2 on 02/27/03.  Testing is progressing 
on TAPS#2. TAPS#1 is still under control of the development team.

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Automation (ROBOTT):

Moving of the Offline subsystem has been delayed pending approval of 
updated offline activities and testing of those activities. The release of 
the Command & Control subsystem has been delayed until completion of 
WIND/POLAR automation task, new release date is TBD.

HSM is currently being tested by the FOT on string 3. HSM has been working 
well except for a few random problems that need to be addressed. It will go 
through several iterations before being moved to string 2. Once any piece 
of the ROBOTT software is moved to string 2, it will referred to as an 
'engineering' version and any problems will be documented via CDS.

============================================================================
Anomalies:

DOY 03057 (02/26/2003) - ACE Anomaly Report G03-0007        GDS(DSS-27) 
Problem with Doppler Receiver
 From 17:00:46 to 17:16:13, the MOC received degraded VC2 data.  We also 
noticed that the DSN RCVR_A_AGC dropped about 3-4 dB from -121dB to 
-125dB.  Around 17:10 the FOT notified DSN of the problem.  DSS-27 informed 
the FOT they had to swap receiver 1 to receiver 3 for the doppler 
receiver.  DSS-27 reported Receiver 1 had started to give them 
problems.  The station attempted to re-acquire MFR1, adjusting the LBW to 
300 vice 1000. No improvement on the SNR.  The operator then deselected the 
RER Switch from MFR1 to MFR3. Telemetry SNR improved from 7.5 to 
13.  IMPACT: NONE, all data was recovered.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Glen A. Miller
Honeywell Technology Solutions Inc.

ACE Flight Operations Team
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~