ACE Weekly Report:  05-09-01

All ACE spacecraft subsystems are performing nominally.  An attitude
maneuver was successfully performed on 05-09-01.  The next attitude
maneuver is scheduled for 05-16-01.

Total Percentage Data Capture April:  99.982%

Two OCRs were executed this week for the ULEIS instrument.  The
first, OCR ULEIS-041, was executed on 05-07-01 to fix errors in RAM
which would resolve outstanding issues stemming from an anomaly in
March and another in April.  However, the expected results were not
seen.  After analysis was performed by the Instrument team, it was
determined that an additional patch would be needed.  OCR ULEIS-042
was executed on 05-08-01.  Again, unexpected results occurred.  The
Instrument team continues to analyze the anomaly.

The SEPICA Instrument team continued their ramp up activities this
week.  On 05-07-01 commands were sent to raise the 30kV power supply
set point to 3.4 kV.

Anomalies:
G01-0039:  During the support on 05-08-01 FOT notified by Station D16
that commands were being rejected at the CPA.  The ACE MOC was not
commanding at the time.  The rejected commands had the correct ACE
S/C Id (92) and had a source code of D66.  JPL and D66 investigated
internally and were unable to isolate the source of the commands to
Station D16.  The ACE NOPE continues to investigate and will perform
internal delogs to further isolate the source of the commands.

================================================
Jacqueline Maldonado Snell
Honeywell Technology Solutions Incorporated (HTSI)
Goddard Space Flight Center
Bldg. 3 Rm N135C, Code 428.2
Greenbelt, MD 20771
Phone: (301) 286-7072
Fax:   (301) 286-0218
E-mail:   Jacqueline.Snell.1@gsfc.nasa.gov