ACE Weekly 04/08/05 - 04/14/05

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type         Attitude #1   Attitude #2
	Date         04/08/05      04/08/05
	DOY          098 2005      098 2005
	Thrusters    2R 4R+ 4R-    2R 4R+ 4R-
	Duration     6:44 min      7:47 min
	Start Time   17:21:34z     18:40:11z
	Stop Time    17:28:18z     18:47:58z
	Firing       34 pulses     40 pulses

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 is
scheduled for Tuesday 04/19/05.

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Extra Activities:

DOY 101 (04/11/05) No impact to ground systems during UPS automatic
switchgear testing.

DOY 102/103 (04/12/05 & 04/13/05) SSRs A and B 30 Telemetry Sections
downlinked.  No new Single Bit errors (correctable) found.

DOY 103 (04/13/05) No impact to ground systems from 3rdQTR GISTVST Scans.
No vulnerabilities found.

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Anomalies:

DOY 101 (04/11/05) ACE Anomaly G05-0053  AC3WS3 Power Supply Failure
Power supply on String 3 Workstation 3 failed.  Sys Admins and Hardware
Maintenance replaced power supply. TT#5077
IMPACT:  None.  String 3 is backup ground system.

DOY 102 (04/12/05) ACE Anomaly G05-0054  TPOCC Data Server
While running s_tlm_sections.prc, the data server hadn't updated the
telemetry parameters before the procedure had reached the telemetry checks.
This last occurred on 11/16/04 (AR G04-0135)
IMPACT:  Minimal.  FOT intervention to continue procedure execution.

DOY 102 (04/12/05) ACE Anomaly S05-0011  SSCPAM5V Red Limit Violation
SSCPAM5V flagged 2 brief red high limit violations (2 consecutive values
> -4.5V) at 20:07:30z and 20:31:31z.  Jim Raines notified.
IMPACT:  Awaiting instructions from instrumenters if necessary.

DOY 103 (04/13/05) ACE Anomaly G05-0055  MAD 26m DSS-66 CMD Mod Index
Commands were not received by the spacecraft due to incorrect CMD Mod Index
(0.39dB instead of 1.69dB).  FOT notified station of the problem.
DR#M103158
IMPACT:  Activities delayed 20 minutes.

DOY 103 (04/13/05) ACE Anomaly G05-0056  ROBOTT Did Not Resume
After the CMD Mod Index problem was resolved, the procedure executed
successfully.  ROBOTT, however, did not resume and did not start the next
procedure.  ROBOTT manually resumed and pass activities completed
successfully.  Developers notified of problem, DR pending.
IMPACT:  Minimal with intervention.

DOY 104 (04/14/05) ACE Anomaly G05-0057  GDS 26m DSS-16 MFR Swap
Station switched MFRs (Multi-Function Receivers) due to telemetry
fluctuations.  Uplink resweep also performed.  DR#G105545
IMPACT:  Activities delayed 9 minutes.