ACE Weekly 08/31/2007 - 09/06/2007 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude Attitude SK-45 Date 09/06/2007 09/06/2007 09/06/2007 DOY 249 2007 249 2007 249 2007 Thrusters 2R 4R+ 4R- 2R 4R+ 4R- 3A 4A Duration 3:12 min 9:05 min 53.574 sec Start 15:48:20z 17:02:11z 18:53:58z Stop 15:51:32z 17:11:16z 18:54:52z StartHGA -7.10deg -4.18deg +8.20deg StopHGA -4.18deg +8.20deg +7.85deg Firing 17 pulses 46 pulses Continuous FuelUsed 0.0628lbs 0.1556lbs 0.1944lbs FuelRemain 154.7812lbs 154.6256lbs 154.4312lbs FinalSCMass 1389.041lbs 1388.885lbs 1388.691lbs The next attitude maneuver is scheduled for Wednesday, 09/19/2007. ============================================================================ OCRs: None ============================================================================ Activities: Space Link Extension (SLE) - DSS-66 was not able to support the SLE test on Thursday 09/06/2007. Additional configuration files (Desktops) are needed for the 26m antennas that were not needed for the 34m antennas. DSN will be delivering the configuration files to the 26m antennas for the upcoming DSS-46 test. Testing and configuration of the ACE SLE software continues. DSN SLE Tests have been scheduled for Tuesday 09/11/2007 (D34) and Wednesday 09/12/2007 (D46). Planning continues for integrating ACE operations into a multi-mission ops center (MMOC). The current TPOCC mission software will be replaced by ITOS and the ROBOTT automation software will be replaced by GMSEC tools (CAT, GREAT, ANSR, etc). The ADS attitude software will be replaced by MSASS/MTASS. The timeline for when this will occur has not yet been determined. DSN warned of possible Radio Frequency Interference (RFI) on Wednesday 09/05/2007 and Thursday 09/06/2007. No impact to the pass was noticed. ============================================================================ Anomalies: DOY 244 09/01/2007 S-ACE-0222 G07-0076 TPOCC Startup Incomplete On Saturday, TPOCC was not able to start the process for connecting the command echo port. The FOT arrived in the MOC at BOT and started troubleshooting the problem. By BOT+35minutes it was decided to continue with the pass since receiving DSN command echoes was not critical. The problem occurred again on Sunday 09/02/2007. At BOT+15minutes, it was again decided to continue with the pass without the DSN command echoes. The SysAdmins were notified and after the Sunday pass, the front end workstation was rebooted and this resolved the problem. Note, the ROBOTT automation software was not designed to do a failover to the backup string if the TPOCC mission software does not completely start. IMPACT: The TPOCC software could not continue without manual intervention. Saturday activities delayed 35 minutes, Sunday activities delayed 15 minutes. FOT effort for troubleshooting the problem. DOY 247 09/04/2007 S-ACE-0223 G07-0077 Archive Files Overwritten While archiving TPOCC history files from the SLE test passes (08/28/2007 & 08/29/2007), additional TPOCC history files were transferred which overwrote the original files from the operations pass. Fortunately, the original files were retrieved from the dual archive on the acetlanpc. IMPACT: TPOCC history files are archived internally and do not impact ASC level zero processing. DOY 249 09/06/2007 S-ACE-0224 G07-0078 Incorrect Title for DSN Test/SPS DSN is using the ACE downlink to test DSS-16 for DAWN launch support. This is not a problem and DSN has performed tests like these in the past. However, with DSN's new Service Preparation Subsystem (SPS), these passes have ACE listed as the USER in the DSN schedule. The ROBOTT automation software configures ACE passes unless TEST or TST are in the activity field. DSN NOPEs were told that TEST or TST needed in the activity field. However, a DSS-16 test was scheduled for Wednesday 09/06/2007, but did not have TEST or TST in the activity field. The FOT requested the DSN Ops Chief correct the DSN schedule. IMPACT: If the schedule was not corrected, then the ROBOTT automation software would have started another instance of the mission software during our maneuvers. DOY 249 09/06/2007 S-ACE-0225 G07-0079 ROBOTT/C&C Start 2 Procs & Froze ROBOTT/C&C started 2 procedures without waiting for the other to complete; S_OPS_PLBK_COMPLETE/19:01:43 and G_END_DAY/19:05:48. Both procedures eventually completed successfully, but C&C eventually froze. CDSID#21085, #21122 & #21192 IMPACT: These are recurring issues that the ROBOTT developers are aware of. Procedure G_ACEDOWN was not performed.