ACE Weekly 03/14/03 - 03/20/03

All ACE spacecraft subsystems are performing nominally. No attitude 
maneuvers were performed this reporting period. The next attitude maneuver 
is scheduled for 03/21/03.

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Orbit Event:

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

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 with 
emphasis being placed on fixing the DRs attributed to the current release. 
TAPS Patch 4.1.1 was installed on TAPS #2 on 02/27/03. Testing is 
progressing on both TAPS#1 and TAPS#2. TAPS#1's system was wiped by the 
TSMs and TAPS 4.1.1 was installed on 02/18/03 and released to testing.

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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 03075 (3/16/2003) - ACE Anomaly Report G03-0014 - DSN GDS(DSS-54) - 
Incorrect Predicts
At 13:10:00 DSS-54 was not able to bring telemetry online due to having the 
wrong station predicts.  At 13:54:23 station DSS-54 was able to bring 
telemetry on line.  Telemetry was delayed for 45 minutes.
DSS-54 predicts were 20 degrees off the expected angle.  IMPACT: Telemetry 
acquisition delayed for 45 minutes.  All data was recovered.   DR# M101446.

DOY 03078 (3/19/2003) - ACE Anomaly Report G03-0015 - DSN GDS(DSS-27) - 
Exciter Problem
At AOS DSS-27 couldn't get solid uplink. After verifying the ground systemd 
the FOT suggested to DSS-27 that they reconfigure their system from 
scratch.  Finally fixed at 16:28 (BOT 15:20).  DSS-27 performed an Exciter 
INIT.  IMPACT:  Commanding delayed 68 minutes.  Could not complete dump of 
SSR A.   Dump completed on subsequent passes.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~