ACE Weekly 06/18/04 - 06/24/04 All ACE spacecraft subsystems are performing nominally. No maneuvers were executed this reporting period. The next attitude maneuver is scheduled for 06/25/04. ============================================================================ 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 the first week of July 2004. 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. -- There are 4 major issues to be resolved: 1) Inability to turn off alarm tones 2) C&C continues tasks if commands aren't verified 3) C&C notifications are not being created and paged 4) Pass Summaries not being saved -- Currently there are 11 of 23 DRs verified - 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 04170 (6/18/2004) ACE Anomaly G04-0053 - GDS 26m (DSS-16) RCVR B Lost Lock DSS-16's antenna went off-point which resulted in loss of lock on the spacecraft receiver B. A resweep was requested by the FOT and lock was reacquired on both receivers. IMPACT: Loss of command capability for approximately 5 minutes. DR# G104512 DOY 04172 (6/20/2004) ACE Anomaly G04-0054 - Messages in FORMATS Transmit Queue When the script fmtcheck was run the FOT noticed several files were waiting to be transmitted in the Transmit directory. FORMATS displayed numerous error messages that stated, "FTP: Service not available, remote server has closed connection." IMPACT: None. APL remote server eventually brought back online and products were sent. DOY 04173 (6/21/2004) ACE Anomaly G04-0055 - GDS 34m (DSS-27) Station RED DSS-27 unable to move antenna to point. Acquired time on DSS-54 from 1330Z-1525Z. DOY 174 pass with DSS-27 extended 1 hour (EOT now 1755). IMPACT: Unable to get complete recorder dump. Data subsequently retrieved on next day's pass. DR# G104526 DOY 04174 (6/22/2004) ACE Anomaly G04-0056 - GDS 34m (DSS-27) Receiver & Ranging Processor Reboot At 13:46:16 telemetry stopped and DSS-27 reported having problems with the timing of RRP. A reboot of the RRP was required and at 14:04:16 telemetry was reacquired. IMPACT: Unable to complete dump of recorder. DR# G104531 DOY 04174 (6/22/2004) ACE Anomaly G04-0057 - GDS 34m (DSS-27) Goldstone Power Outage At 14:44:56 telemetry stopped and DSS-27 reported that all Goldstone stations were down due to a power supply failure (Coherent Reference Generator). At 16:43:14 telemetry came back online. Pass was extended 2 hours 15 minutes to try and complete SSR dump. IMPACT: SSR had to be redumped and last 20 slices were not able to be retrieved during pass. Data subsequently retrieved on the next day's pass. DR# G104532 DOY 04176 (6/24/2004) ACE Anomaly G04-0058 - GDS 26m (DSS-16) Antenna Y-Axis Stopped Tracking Antenna Y-Axis stopped tracking without warning. Antenna interface unit had a Y-Axis brake pressure light illuminate when the axis stopped. This occurred twice. First occurrence was 1243Z and second time was 1313Z. The first time antenna was in auto track mode and the second in program mode. IMPACT: Delayed pass activities. Lost telemetry subsequently retrieved from next day's recorder dump. DR# G104539 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~