ACE Weekly 07/29/05 - 08/04/05 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude Date 08/01/05 DOY 213 2005 Thrusters 2R 4R+ 4R- Duration 11:47 min Start Time 16:02:12z Stop Time 16:13:59z Firing 60 pulses The next attitude maneuver is scheduled for Wednesday 08/10/05. ============================================================================ OCRs: None ============================================================================ Ongoing Activities: Space Link Extension (SLE) - Development continues within the TDF configuration. The DSN/Developer August 25 test has been postponed due to scheduling and is tentatively set for September 1. ROBOTT - The installation/configuration error on String 2 was resolved. Testing of the String 2 continues. ============================================================================ Extra Activities: We have started receiving the new DSN 0158 Monitor Data Rev B from DSS-66 (DOY 211) and DSS-16 (DOY 214). The new Monitor Data provides additional data useful for troubleshooting and corrects problems found in the original 0158 Monitor Data. ============================================================================ Anomalies: DOY 210 (07/29/05) ACE Anomaly S05-0029 S3DPU_CONV_SEC_I violation S3DPU_CONV_SEC_I had 3 brief red high limit violations (RH > 440mA). The SSDIDLECTR was ~40 in all 3 cases. 2005-210 10:04:53 - 10:05:25z 451.03 - 454.952 mA 45-32 2005-210 10:28:53 - 10:29:25z 447.108 - 458.874 mA 51-35 2005-210 10:41:41 - 10:42:13z 443.186 - 486.328 mA 25-28 IMPACT: S3DPU is expected to use more current during increased activity. DOY 210 (07/29/05) ACE Anomaly G05-0101 /trend Drive Inaccessible Backup string was unable to access /trend drive. Problem corrected by SysAdmins. IMPACT: None, operations had not been using backup string. DOY 210 (07/29/05) ACE Anomaly G05-0102 Display Replaced AC2XT1 display had a poor image quality. It was decided to have Hardware Maintenance repair the monitor. IMPACT: None, the display was replaced before it had failed. DOY 213 (08/01/05) ACE Anomaly G05-0103 Thruster_Setup Procedure The Thruster_Setup procedure delivered by MOPSS was named version #02. Reason unknown for why MOPSS used a different version number. The contents of the Thruster_Setup procedure was checked and found to be correct. IMPACT: None, the procedure was successfully used for the maneuver. DOY 214 (08/02/05) ACE Anomaly S05-0030 S3DPU_CONV_SEC_I violation S3DPU_CONV_SEC_I had 1 brief red high limit violations (RH > 440mA). The SSDIDLECTR was ~67. 2005-214 14:46:33 - 14:46:35z 451.03 - 466.718 mA 65-69 IMPACT: S3DPU is expected to use more current during increased activity. DOY 216 (08/04/05) ACE Anomaly G05-0104 GDS DSS-16 Loss of Telemetry Ground station receiver lost lock at 10 minutes before End Of Track. NOAA stations, RAL and WCDA, did not have problems acquiring telemetry. IMPACT: Minimal, SSR playback and state-of-health commanding had been completed. DOY 216 (08/04/05) ACE Anomaly G05-0105 GDS DSS-16 CMD Mod Index The command modulation index was 8.80 dB. (Nominal value is 1.69 dB, 0.86 radian). The increased command modulation index resulted in a decreased spacecraft receiver strength. All commands, however, were successfully received by the spacecraft. IMPACT: Minimal, all commands received by the spacecraft.