ACE Weekly 04/05/05 - 04/21/05

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No attitude maneuvers were completed this week.  The next attitude maneuver
is scheduled for Friday 04/22/05.

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OCRs:

None

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Ongoing Activities:

Space Link Extension (SLE) - The NASA review of SLE Requirements was
completed Tuesday 04/19/05.  The design review is scheduled for Tuesday
05/10/05.

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Extra Activities:

None

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Anomalies:

DOY 105 (04/15/05) ACE Anomaly G05-0058  26m GDS DSS-16 TCP Problems
Station problems with TCPs (Telemetry Control Processors).  DR#G105550
IMPACT:  Activities delayed 53 minutes.  Pass extended to complete playback.

DOY 105 (04/15/05) ACE Anomaly G05-0058  26m GDS DSS-16 CMD Mod Index
Several commands did not reach the spacecraft on the initial transmission
during end of day activities.  This was determined (post-pass) to be due to
the CMD Mod Index using 0158 Monitor Data.  Commands were retransmitted
until accepted, except for   C&DH B LRT Poke which is programmed to not be
retransmitted.  DR#N102794
IMPACT:  Minimal.

DOY 108 (04/18/05) ACE Anomaly G05-0058  Tape Failure
Recent batch of tapes (Qty 10) used for file backups and archives do not
work with tape drive on string 1.  Tapes do work with tape drive on string
2.
IMPACT:  The batch of tapes will not be used on string 1.

DOY 108 (04/18/05) ACE Anomaly G05-0059  34m GDS DSS-34 TLP Reset
Station performed a TLP symbol reset and successfully acquired telemetry.
DR#G105553
IMPACT:  Minimal.  Activities delayed 5 minutes.

DOY 109 (04/19/05) ACE Anomaly G05-0060  TAPS Data Capture
TAPS VC2 data capture on ac1taps1 terminated on DOY 104, the day scans were
performed.  No problems with ac2taps2.  Data capture restarted and affected
data was transferred from ac2taps2 to ac1taps1.
IMPACT:  Minimal.  All data copied from redundant TAPS.