ACE Weekly 07/02/04 - 07/08/04 All ACE spacecraft subsystems are performing nominally. No attitude maneuvers were executed this reporting period. The next attitude maneuver is scheduled for 07/09/04. ============================================================================ Orbit Events: The next ACE SEV transit will occur in the mid-Aug to early Sep '04 timeframe. ===================================================================== OCRs Executed: NONE ===================================================================== Ongoing Activities: TAPS: - Transition from GTAS to TAPS occurred on 03/18/04. All trending activities are being accomplished using TAPS. - Installation of TAPS release 4.3 is tentatively scheduled for 07/19/04. All open DRs will be fixed in this release. ---------------------------------------------------------------------------- Automation (ROBOTT): - Release 0.7 has been delivered to String 3 and undergoing test at this time. -- FOT testing continues. -- Installation on String 2 tentatively scheduled for 07/12/04. -- Installation on String 1 tentatively scheduled for 07/29/04. - SUG development is ongoing. A DRAFT version has been delivered and comments have been provided to the developer. - FOT training on ROBOTT began 05/05/04 and additional sessions are being developed. ============================================================================ Extra Spacecraft Activities: None ===================================================================== Anomalies: DOY 04188 (07/06/04) ACE Anomaly G04-0062 - GDS 34m (DSS-27) Dropped Blocks At 12:35, the FOT noticed VC2 sequence errors (dropped blocks) and notified DSS-27. The station checked and reported everything appeared nominal. The FOT then contacted JPL COMM to report the same problem. At 12:50, the FOT contacted the CD Manager at GSFC to request they check to insure the problem was not with the fanout. At 12:52, DSS-27 reported they would switch to a backup channel in order to troubleshoot the problem. At 12:53, the backup channel was put online. At 13:07, the FOT informed DSS-27 that the dropped blocks ceased. However, minutes later, the VC2 sequence errors started to reappear. At 13:16, the TSS informed the FOT that they may have isolated the problem. However, after 20 minutes, the VC2 sequence errors continued. The errors continued throughout the entire pass. IMPACT: Degraded telemetry throughout pass. All data subsequently recovered. DR# G104594 DOY 04188 (07/06/04) ACE Anomaly G04-0063 - GDS 34m (DSS-27) Telemetry Outages Numerous telemetry dropouts throughout pass. Related to ACE Anomaly G04-0062. IMPACT: Telemetry outage (15:09:43 - 15:11:54) occurred during the execution of procedure s_auto_redumps requiring SSR-B slices 514-523 to be redumped on Day 189. All telemetry subsequently recovered. DR# G104594 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Glen A. Miller ACE Flight Operations Observatory Engineer Honeywell Technology Solutions Inc. Goddard Space Flight Center Building 14, Room W10A Mail Stop 428.2 Greenbelt, MD 20771 Office: 301-286-7071 Pager: 800-425-3174 Fax: 301-286-1729 gamiller@pop500.gsfc.nasa.gov ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~