ACE Weekly 04/04/03 - 04/10/03

All ACE spacecraft subsystems are performing nominally. An attitude 
maneuver was performed successfully on 04/04/03. The next attitude maneuver 
is scheduled for 04/14/03.

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Orbit Events:

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. 
Testing is progressing on both TAPS#1 and TAPS#2.

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Automation (ROBOTT):

Offline and HSM are scheduled to be moved to String 2 on April 15th. 
Command and Control is still being tested by the Automation team. Date for 
release to FOT for testing is still TBD.

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

DOY 03094 (04/04/2003) ACE Anomaly Report #G03-0023 - IMOC ADS Display 
Locked Up
At 16:04:54, about 2 minutes before the maneuver was about to start, the 
star data for STAR_X had a value of 0.0000000. At the same time, the ADS 
displays on Strings 1 and 2 froze. Block replay of time before 16:04:00 and 
after 16:05:00 were performed so FDF could get the pre-maneuver solution. 
IMPACT: NONE. Solution obtained post-pass. Maneuver executed nominally.

DOY 03095 (04/05/2003) - ACE Anomaly Report #G03-0024 DSN 26m (DSS-16) TCP 
Didn't Lock Up
At 15:31, DSS-16 asked if the FOT was supposed to be seeing data - no data 
was seen by the FOT or DSS-16.  DSS-16 informed the FOT that a reset on the 
TCP was being performed because they were not seeing telemetry input. At 
15:40, the FOT started receiving data (BOT expected at 15:35) and was given 
a go for command. While running the procedure g_initial_contact, the first 
command sent (bin_clear) didn't reach the Spacecraft.  Commanding was 
automatically paused and DSS-16 was informed.  DSS-16 stated the command 
was received but not radiated.  DSS-16 asked the FOT to resend the 
command.  The FOT performed a /resume and verification was received from 
the Spacecraft.  DSS-16 stated that latency was enabled after the first 
command failed to reach the Spacecraft. IMPACT: Delayed AOS. All command 
objectives met. DR# G102596

NOTE:  The previous two anomalies were inadvertently reported in the 
previous weekly report.

DOY 03099 (04/09/2003) - ACE Anomaly Report #G03-0025  DSN 26m (DSS-66) 
Scheduled Station RED
Scheduled pass with DSS-66 was canceled due to the Madrid NFS server being 
declared red. DSS-24 had maintenance time scheduled but the FOT was able to 
obtain some of that time for a pass. IMPACT:  None.  Pass was rescheduled 
using DSS-24 and all pass objectives were met.  DR# M101518.






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