ACE Weekly 07/15/05 - 07/21/05 (OCR SC 05-001 execution date corrected) All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: No attitude maneuvers were completed this week. The next attitude maneuver is scheduled for Friday 07/22/05. ============================================================================ OCRs: DOY 202 (07/21/05) SC 05-001 - SSR Failover Block Bins have been reloaded. If the recorder becomes full, the other recorder will start recording at Segment 0 (previously set to Segment 1). SSR Failover occurs when a DSN support is lost and another support is not scheduled. The Segment 0 benefits include the ability to automate data recovery and capture all data without scheduling additional DSN time (additional time is still preferred however). Data loss can still occur under certain conditions including more than 2 supports are lost or the SSR was not completely dumped before an SSR Failover occurred. ============================================================================ Ongoing Activities: Space Link Extension (SLE) - Development continues within the TDF configuration. The next ACE JPL telecon is scheduled for 07/21/05. The DSN/Developer test with DTF-21 is scheduled for 08/04/05. ROBOTT - FOT testing of Version 1.0 is underway on String 3. ============================================================================ Extra Activities: None ============================================================================ Anomalies: DOY 196 (07/15/05) ACE Anomaly G05-0097 GDS DSS-16 Transmitter Problems Uplink to the spacecraft was lost from 14:35:13 to 14:39:24z and from 15:16:13z onward due to ground station problems with the Transmitter Heat Exchanger. Support was switched to DSS-27 at 15:44:27z. DR# G105836 IMPACT: Minimal. Commanding was completed with DSS-27. DOY 197 (07/16/05) ACE Anomaly S05-0025 S3DPU Limit Violation S3DPU_CONV_SEC_I had 2 brief red high limit violations (>440mA). The SSDIDLECTR was ~40 in both cases. Mark Popecki notified. 2005-197 19:41:25 - 19:42:27z 466.718 - 478.484mA 2005-197 19:53:43 - 19:53:46z 447.108 - 458.874mA IMPACT: S3DPU is expected to use more current during increased activity. DOY 198 (07/17/05) ACE Anomaly S05-0026 SWICS Limit Violation SSCPAP5V had 1 brief yellow low limit violation (<4.25V). Jim Raines notified. 2005-198 04:17:02 - 04:17:38z 4.112 - 4.208V IMPACT: Awaiting instructions from Jim Raines. DOY 198 (07/17/05) ACE Anomaly S05-0028 SWICS Limit Violation SSCPAM5V had 1 brief red high limit violation (>-4.5V). Jim Raines notified. 2005-198 22:06:58 - 22:07:22z -4.412 - -4.451V IMPACT: Awaiting instructions from Jim Raines. DOY 199 (07/15/05) ACE Anomaly G05-0098 GDS DSS-24 Transmitter Problems Uplink to the spacecraft was lost from 17:01:41 to 17:45:00z (EOT) due to transmitter problems. Station was unable to correct problem before EOT. DR# G105850 IMPACT: End Of Track spacecraft state-of-health checks not were not completed. SSR data redumps were completed on DOY 200. DOY 199 (07/15/05) ACE Anomaly G05-0099 Workstation Desktop Frozen Workstation ac1ws2 desktop frozen. Processes were remotely terminated and workstation logged back on successfully. Rogue APU process had excessive CPU usage. IMPACT: Minimal. FORMATS software reinitialized. DOY 199 (07/18/05) ACE Anomaly S05-0027 S3DPU Limit Violation S3DPU_CONV_SEC_I had 1 brief red high limit violations (>440mA). The SSDIDLECTR was ~70 in both cases. Mark Popecki notified. 2005-199 14:31:45 - 14:31:47z 443.186 - 454.952mA IMPACT: Awaiting instructions from Mark Popecki. DOY 201 (07/17/05) ACE Anomaly G05-0100 GDS DSS-16 Spacecraft RCVR B Receiver B was not in-lock at beginning of track. FOT requested uplink resweep and both receivers were successfully locked. This occurs occasionally (last occurrence 2/15/05) since Receiver B is not part of the 2-way loop and therefore the station is unable to determine Rcvr B lock during uplink sweep. DR#G105859 IMPACT: C&DH B successfully commanded after uplink resweep.