ACE Weekly 08/01/03 - 08/07/03 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was successfully executed on 08/07/03. The next attitude maneuver is scheduled for 08/18/03. ============================================================================ Orbit Events: The next SEV transit will occur during the 09/01/03 - 09/23/03 time frame. Expected minimum SEV angle will be 1.76 degrees. The essential timeline based on a 30-min step scan for this 22 day, 8.5 hour event is: - SEZ entry (4.75 deg inbound) on Sept. 1 at 0100Z - Minimum Sun-Earth-ACE angle = 1.760 deg on Sept. 12 at 0800Z - SEZ exit (4.75 deg outbound) on Sept. 23 at 0930Z ============================================================================ OCRs Executed: NONE ============================================================================ Ongoing Activities: TAPS: Trending, Analysis and Plotting System (TAPS) development continues with emphasis being placed on fixing the DRs attributed to prior releases. Release 4.1.6 was installed successfully on 08/05/03 and is currently in test by FOT. ---------------------------------------------------------------------------- Automation (ROBOTT): FOT testing of ROBOTT Release 0.1 is ongoing. CRON testing on String 2 is progressing, although some minor problems have occurred. Command & Control (C&C) ES still in development phase. Testing results and corrections still need to be made. Expected development testing by the Automation Team to resume at the end of August. FOT testing of the latest OFFLINE release on String 3 is progressing and should be completed in time for the install of OFFLINE on String 2 next Thursday (14 Aug 03). ============================================================================ Anomalies: DOY 03215 (08/03/2003) - ACE Anomaly G03-0069 - MAD 26m (DSS-66) TCP Swap/Reboot Data was offline from 14:33:07 through 14:34:04 and from 14:37:31 through 14:45:51. Contacted DSS-66, after the first telemetry dropout swapped from Telemetry Control Processor (TCP) 1 to TCP 2. After the second telemetry dropout, rebooted TCP 1 then swapped from TCP 2 back to TCP 1. No further problems seen during the pass. IMPACT: None. All data was recovered. DR# M101792 DOY 03217 (08/05/2003) - ACE Anomaly S03-0016 - Mnemonic SSCPAM5V Red High Limit Violation At 18:28:36 SSCPAM5V violated the red high limit of -4.5V, at a value of -4.49. It returned within limits at 18:29:13. Notified J. Raines. IMPACT: Unknown. FOT will continue to monitor. DOY 03219 (08/07/2003) - ACE Anomaly G03-0070 - GDS 26m (DSS-16) No Tracking Data At 13:05, DSS-16 reported errors with the tracking data. The station stated they will need to drop their carrier and reboot the MPA (Metric Pointing Assembly). At 13:12, the FOT gave DSS-16 a go to take down the carrier and reboot the MPA. DSS-16 estimated it would take 10 minutes to reboot the MPA. At 13:15:20, telemetry went offline. At 13:29, DSS-16 stated the reboot was complete but the errors remained. Telemetry was back online at 13:33:53. The station asked the FOT if they would to attempt another reboot of the MPA. After consulting FDF, the FOT decided against another reboot and continued with the pass without tracking data. At 13:37, the FOT gave DSS-16 a go to bring carrier up. At 13:39, the FOT received the go for command and confirmed a good command link with a /NO_OP. IMPACT: Loss ability to command from 13:12 to 13:43. No tracking data for entire pass. All telemetry was eventually recovered. DR# G103147 DOY 03219 (08/07/2003) - ACE Anomaly G03-0071 - GDS 26m (DSS-16) Antenna Stopped At 15:16:09 telemetry dropped out. DSS-16 stated that their antenna had 'stopped'. Telemetry lost again at 16:59:50 due to the same problem. IMPACT: About 6 minutes of telemetry was lost for both outages. All data was recovered in redumps of the SSR. DR# G103154 DOY 03219 (8/07/2003) - ACE Anomaly G03-0072 - GDS 26m (DSS-16) TCP reboot Telemetry dropped out at 15:23:29. DSS-16 stated that both their TCP's had 'halted'. DSS-16 rebooted the TCP's and telemetry was back online at 15:29:58. A /NO_OP commands was sent to verify a good command link. IMPACT: About 6 minutes of telemetry loss. All data was recovered in playbacks of the SSR. DR# G103155 DOY 03219 (08/07/2003) - ACE Anomaly G03-0072 - GDS 26m (DSS-16) Monitor Blocks Offline From 15:25 to 15:44 DSN monitor blocks were offline. DSS-16 swapped their RNS and SCP systems. IMPACT: No Monitor data for 20 minutes. DR# G103156 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 Email: gamiller@pop500.gsfc.nasa.gov ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~