ACE Weekly Report:  07-12-00

All ACE spacecraft subsystems are performing nominally. An Attitude
maneuver was successfully executed on 07-07-00.  The next attitude
maneuver is scheduled for 07-18-00.

DSN has placed its plans to transfer its overseas sites to the 26
Meter Automated System on hold until various Projects have verified
the equipment.  ACE has scheduled a test support for Day 195.
Station 66 (Madrid) will have the 26 Meter Automated System
configured for the support.  The legacy equipment will be available
in the event of any problems.

On 07-10-00 ACE had two ground anomalies during the support.  Station
66 was sending bad ranging data.  The problem was corrected and good
ranging data was confirmed by the FDF analyst (DR #L04513).  ACE also
suffered a 4 minute and 5 second telemetry dropout due to problems
with Station 66 receiver.  The problem was resolved and the remainder
of the support completed without any further problems.  All SSR data
successfully captured (DR #L04512).

SEPICA Status:
On 07-07-00 the SEPICA Instrument team informed the FOT that they had
recently determined that "since day 2000/107, three measurement
channels have not been coming out of SEPICA. These channels are known
as Y10, Y11 and Y12.  The information they provide is essential for
ionic charge state measurement, which is one of the primary missions
of the SEPICA instrument."

Initial observations by the SEPICA Instrument team led them to
believe it was a data processing problem, as opposed to a hardware
failure.  Several OCRs have been executed as part of a continuing
investigation and to trouble shoot the problem.  The latest status
report from the instrument team states,  "We are getting good data
from one half and good data from part of the other half.  One half is
sufficient for science output."

The Instrument team believes that the memory may be damaged and hope
to test this by redirecting data to spare memory.  The FOT is working
with the Instrument team to develop and verify the necessary command
load procedures.  This command activity has yet to be scheduled.