ACE Weekly 11/01/02 - 11/06/02

All ACE spacecraft subsystems are performing nominally. A triple maneuver 
("dog-leg" attitude and a station-keeping maneuver) was performed 
successfully on 11/01/02.  The next maneuver is scheduled for 11/13/02.

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OCRs Executed:

NONE

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Ongoing Activities:

The HGA Angle Constraint Report is still being reviewed.

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Anomalies:

Day 02305 (11/01/2002) ACE Anomaly #S02-0024 Temperature YL Limit Violations
At 13:15:51 TANK_B1_T violated the YL limit of 10 at 9.6472 C.  Returned 
within limits at 13:15:56.  At 13:31:20 TANK_A2_T violated the YL limit of 
10 at 9.6472 C.  Returned within limits at 13:31:27.  This has happened 
before.  Reference AR S02-0003 and S02-0023 for other occurrences.  Under 
Investigation.

Day 02305 (11/01/2002) ACE Anomaly #S02-0025 SC_OP_HTR_I violated cfgmon
At 15:01:58, the SC_OP_HTR_I violated the low cfgmon of 0.83.  The value 
fluctuated between 0.439208 and 0.454894 until 15:35:58 when it went back 
to 0.83.  Preliminary analysis indicates that the +X side panel thermostat 
shut off.  The heater that corresponds to this thermostat is the 
X_PANL_OP_HTR and the current associated with this heater is part of the 
SC_OP_HTR_I.  Under Investigation.

Day 02306 (11/02/2002) ACE Anomaly #G02-0122 GDS(DSS-16) Corrupted data 
from DSN
On days 306 and 307, the MOC received corrupted data from GDS(DSS-16).  D16 
was notified and they did not see anything abnormal on their end.  On Day 
307 at 16:26, D16 switched from TGC (Telemetry Group Controller) 4 Ch 1 to 
TGC 4 Ch 2 and this seemed to correct the corrupted frames however there 
were many wrong spacecraft id's.  Analysis on the FOT side found that the 
data had failed the Reed-Solomon check and had become corrupted somewhere 
between the Reed-Solomon Decoder and the CDR recorder.  The data type 1 CDR 
file, which is Channel 1 data, was downloaded and it also failed the 
Reed-Solomon check.  The data type 2 CDR file, which is Channel 2 data, was 
then downloaded for comparison and the data was not corrupted.  The FOT 
also notified ASC and told them they would need to download the data type 2 
CDR file in order to receive better quality data.  DR#G101785

Day 02309 (11/05/2002) ACE Anomaly #G02-0123 GDS(DSS-27) Delayed AOS
Prior to AOS, GDS(DSS-27) stated that they were having troubles getting the 
antenna pointed.  At approximately 16:50, GDS(DSS-27) stated that they had 
fixed the azimuth problem with the antenna, however there was now a problem 
with the elevation.  GDS(DSS-27) stated that a technician was on his way to 
the antenna but would take approximately 25 minutes to reach the 
antenna.  Data was online at 17:20:34. IMPACT: Unable to complete full dump 
during schedule pass time.  However, the data was retrieved during the next 
day's pass with no problems.
DR#G101808


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
Fax:    301-286-1729
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~