ACE Weekly 06/11/2008 - 06/17/2008 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude Date 06/13/2008 DOY 165 2008 Thrusters 2R 4R+ 4R- Duration 13:41 min Start 15:48:38z Stop 16:02:19z HGAStart -5.92deg HGAStop +7.39deg SunStart 12.91deg SunStop 5.50deg Nutation 0.11deg Firing 70 pulses FuelUsed 0.2255lbs FuelRemain 149.4668lbs FinalSCMass 1383.727lbs The next attitude maneuver is scheduled for Monday 06/23/2008. =========================================================================== OCRs: DOY 169 (06/17/2008) GND-193 ROBOTT 1.0.4 Install on strings 2 & 3 ROBOTT 1.0.4 was installed on Strings 2 & 3 for testing. When testing is complete, the new software will be used for operations. This patch removes the pass number check performed on the DSN schedule. DSN no longer uses the pass number and the field may be blank. ============================================================================ Activities: There have been no updates on the JPL ISO router problem that resulted in several lost ACE passes in May (DOY 124-126 and DOY 134). ============================================================================ Anomalies: DOY 162 06/10/2008 S-ACE-0330 G08-0066 ROBOTT/C&C Terminated Procedure The MOC automation software, ROBOTT, prematurely terminated the SSR redump procedure (s_ops_plbk_complete.prc). ROBOTT did not see that the previous procedure had completed and terminated all procedures. This is a known issue (CDSID#21122) which last occurred on 03/24/2008 (AR#G08-0033). IMPACT: Minimal. No redumps were required. DOY 165 06/13/2008 S-ACE-0331 G08-0067 FORMATS Stopped Processing The FORMATS software delivers files to various locations (e.g. Attitude and Clock Reports to ASC & NOAA). Usually the software is quite reliable, but on Monday 06/09/2008 FORMATS stopped processing files. The problem was discovered on Friday 06/13/2008. FORMATS was restarted and the files successfully processed. IMPACT: Attitude and Clock Report delivery to ASC and NOAA delayed several days. DOY 163 06/11/2008 S-ACE-0332 G08-0068 ACE SLE Software Stopped The ACE SLE software is designed to retry connecting to the DSN station once a minute if the connection is lost. However, on DOY 163 after an unexpectedly formed FCLTU-ASYNC-NOTIFY message was received from DSS-27, the ACE SLE software did not attempt to reconnect once a minute. Manual intervention was required to restart the ACE SLE software. Note, this is the first problem encountered with the ACE SLE software. IMPACT: Activities delayed 30 minutes. Without manual intervention, the playback would not have been performed during this pass. DOY 168 06/16/2008 S-ACE-0333 G08-0069 AC2WS2 Frozen The AC2WS2 workstation froze. The workstation recently had its hard drive replaced. SysAdmins reseated the workstations plugs and cards. No further problems encountered. AC2WS2 is usually configured to monitor the operational string. The workstation had not yet been configured for this task after the hard drive replacement. IMPACT: Minimal. AC2WS2 had not yet been configured to monitor operations.