ACE Weekly 04/08/05 - 04/14/05 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude #1 Attitude #2 Date 04/08/05 04/08/05 DOY 098 2005 098 2005 Thrusters 2R 4R+ 4R- 2R 4R+ 4R- Duration 6:44 min 7:47 min Start Time 17:21:34z 18:40:11z Stop Time 17:28:18z 18:47:58z Firing 34 pulses 40 pulses The next attitude maneuver is scheduled for Friday 04/22/05. ============================================================================ OCRs: None ============================================================================ Ongoing Activities: Space Link Extension (SLE) - The NASA review of SLE Requirements is scheduled for Tuesday 04/19/05. ============================================================================ Extra Activities: DOY 101 (04/11/05) No impact to ground systems during UPS automatic switchgear testing. DOY 102/103 (04/12/05 & 04/13/05) SSRs A and B 30 Telemetry Sections downlinked. No new Single Bit errors (correctable) found. DOY 103 (04/13/05) No impact to ground systems from 3rdQTR GISTVST Scans. No vulnerabilities found. ============================================================================ Anomalies: DOY 101 (04/11/05) ACE Anomaly G05-0053 AC3WS3 Power Supply Failure Power supply on String 3 Workstation 3 failed. Sys Admins and Hardware Maintenance replaced power supply. TT#5077 IMPACT: None. String 3 is backup ground system. DOY 102 (04/12/05) ACE Anomaly G05-0054 TPOCC Data Server While running s_tlm_sections.prc, the data server hadn't updated the telemetry parameters before the procedure had reached the telemetry checks. This last occurred on 11/16/04 (AR G04-0135) IMPACT: Minimal. FOT intervention to continue procedure execution. DOY 102 (04/12/05) ACE Anomaly S05-0011 SSCPAM5V Red Limit Violation SSCPAM5V flagged 2 brief red high limit violations (2 consecutive values > -4.5V) at 20:07:30z and 20:31:31z. Jim Raines notified. IMPACT: Awaiting instructions from instrumenters if necessary. DOY 103 (04/13/05) ACE Anomaly G05-0055 MAD 26m DSS-66 CMD Mod Index Commands were not received by the spacecraft due to incorrect CMD Mod Index (0.39dB instead of 1.69dB). FOT notified station of the problem. DR#M103158 IMPACT: Activities delayed 20 minutes. DOY 103 (04/13/05) ACE Anomaly G05-0056 ROBOTT Did Not Resume After the CMD Mod Index problem was resolved, the procedure executed successfully. ROBOTT, however, did not resume and did not start the next procedure. ROBOTT manually resumed and pass activities completed successfully. Developers notified of problem, DR pending. IMPACT: Minimal with intervention. DOY 104 (04/14/05) ACE Anomaly G05-0057 GDS 26m DSS-16 MFR Swap Station switched MFRs (Multi-Function Receivers) due to telemetry fluctuations. Uplink resweep also performed. DR#G105545 IMPACT: Activities delayed 9 minutes.