ACE Weekly 10/04/02 - 10/10/02 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was executed this week with no problems to report. The next attitude maneuver is scheduled for 10/11/02. ============================================================================ OCRs Executed: NONE ============================================================================ Ongoing Activities: The HGA Angle Constraint Report is being reviewed and will be released in the near future. A NSP PIT was conducted on DOY 281. The only problem noticed during analysis was that the Ground Receipt Time (GRT) was off by approximately one year in the 498 bps data rate. ============================================================================ Anomalies: Day 02277 (10/4/2002) ACE Anomaly #S02-0023 Limit Violations Between 13:22:35 and 13:22:42 there were 3 yellow low limit violations (YL=10C). At 13:22:35 INT_LINES_A_T violated at 9.6472 C, then returned to 10.27465 C at 13:22:49. At 13:22:39 TANK_A2_T violated at 9.6472 C, then returned to 10.9021 C at 13:22:47. At 13:22:42 TANK_B1_T violated at 9.6472 C, then returned to 12.157 C at 13:22:47. This has happened before. Reference AR S02-0003. Investigation continues. Day 02277 (10/4/2002) ACE Anomaly #G02-0113 GDS(DSS-66) Telemetry Dropout At 15:01:38 we lost telemetry and it came back online at 15:03:17. DSS-66 doesn't know what caused the problem. All their systems were not touched and everything was working nominally. IMPACT: None, all data was recovered. Day 02277 (10/4/2002) ACE Anomaly #G02-0114 TPOCC - EQUATE errors in G_ACEUP There were problems bringing up String 2 as the backup for the maneuver. The first 2 times it was brought up, procedure G_ACEUP halted at line 168: Dir err: EQUATE state manager is not connected to equation controller. The third time, G_ACEUP succeeded through line 168 (EQUATE ON ALL) but started generating error messages. The ACE software was killed on all workstations. FORMATS was exited and everything on string 2 was logged off. The 4th attempt to bring up string 2 was a success, with no errors. IMPACT: None. DOY 02282 (10/09/02) ACE Anomaly #G02-0115 GDS(DSS-27) MTA Interface Problem During prepass briefing, Station 27 stated they were having troubles getting an interface with the Metric Tracking Assembly (MTA). During postpass debrief, Station 27 stated that there was no tracking data during the entire pass, except for seven minutes. IMPACT: Minimal ranging data. DR#G101681. DOY 02283 (10/10/2002) - ACE Anomaly Report #G02-0116 GDS(DSS-27) MTA Interface Problem AT 17:50 DSS-27 stated they were having troubles keeping the interface with the Metric Tracking Assembly (MTA). IMPACT: Minimal ranging data. DR#G101684. ============================================================================ Other: Product information in DPS Database copied from String 1 is not being removed from String 2. Trouble Ticket number 2002090021 was submitted on 9/19/2002. The Product information still remains on String 2, the status is unknown as to when the products will be deleted. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Glen A. Miller Honeywell Technology Solutions Inc. ACE Flight Operations Team Goddard Space Flight Center Building 14, Room W10A Mail Stop 428.2 Greenbelt, MD 20771 Office: 301-286-7071 Fax: 301-286-1729 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~