ACE Weekly 08/15/03 - 08/21/03

All ACE spacecraft subsystems are performing nominally. An attitude 
maneuver was successfully executed on 08/18/03.  The next attitude maneuver 
is scheduled for 09/03/03.

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Orbit Events:

The next SEV transit will occur during the 09/01/03 - 09/23/03 time frame. 
Expected minimum SEV angle will be 1.76 degrees.

The essential timeline based on a 30-min step scan for this 22 day, 8.5 
hour event is:

- SEZ entry (4.75 deg inbound) on Sept. 1 at 0100Z
- Minimum Sun-Earth-ACE angle = 1.760 deg on Sept. 12 at 0800Z
- SEZ exit (4.75 deg outbound) on Sept. 23 at 0930Z

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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 prior releases. 
Release 4.1.6 was installed successfully on 08/05/03 and is currently in 
test by FOT.  Release 4.1.7 is tentatively scheduled for installation on 
08/26/03.

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Automation (ROBOTT):
- ROBOTT Release 0.2 was installed on String 2 on 08/13/03. Since the 
install, the FOT has been testing at the individual button level with one 
minor environment problem.
- Automation Team testing of HSM and Command & Control on String 3 has 
resumed, delivery date to FOT is still TBD.

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Anomalies:

DOY 03229 (08/17/2003) ACE Anomaly S03-0018 -  S3DPU_CONV_SEC_I  Red High 
Limit Violation
13:57:01      S3DPU_CONV_SEC_I  @ 451.03 violated the Red High limit (>440).
13:57:03      S3DPU_CONV_SEC_I  returned back within limits.
The FOT monitored the S3DPU Idle counter for the remainder of the pass as 
suggested by M. Popecki during previous violations.  Shortly after the FOT 
began monitoring the mnemonic we noticed that it had dropped to a value 
of  "0" which means the S3DPU is very busy.
Contacted Mark Popecki.  Awaiting further instructions. IMPACT:  Unknown at 
this time.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Glen A. Miller
ACE Flight Operations Observatory Engineer
Honeywell Technology Solutions Inc.
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
Email: gamiller@pop500.gsfc.nasa.gov
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