ACE Weekly 07/30/04 - 08/05/04 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was successfully executed on 08/02/04. The next attitude maneuver scheduled for 08/12/04. ============================================================================ Orbit Events: From Craig Roberts (FDF): The next ACE stationkeeping maneuver (SK-33) is tentatively scheduled for 08/20/04, to coincide with a (to be) scheduled attitude reorientation maneuver. Thus SK-33 will be out of the way just as the next SEZ transit--which will have its closest approach to the Sun on 08/30/04 --is beginning. The delta-V for 08/20/04 is currently projected to be about 0.37 m/sec in the anti-Sunward direction. So the burn will be using the top-deck axials 1A and 2A. The burn duration is estimated at 64 seconds. ACE's Lissajous orbit has now transitioned to an opening pattern, so the ACE motion will now be counterclockwise about L1 (and for that matter, the Sun) for quite a long time to come. ===================================================================== OCRs Executed: 08/03/04 - CRIS-011: Due to increased solar activity, the image intensifier went into the OFF position (designed safeguard) at the onset of the solar event. At the direction of Branislav Kecman the image intensifier was commanded back ON. ===================================================================== Ongoing Activities: TAPS: - Installation of TAPS release 4.3 is occurred on 07/20/04. FOT testing of this release is ongoing. -- Of the 6 DRs fixed in release 4.3, 4 have been verified, 2 have failed. - Additional DRs will be submitted for newly found problems. ---------------------------------------------------------------------------- Automation (ROBOTT): - On 07/26/2004, ROBOTT v0.7 was installed on String 1 and reinstalled on Strings 2 and 3 (OCR GND-139). - ROBOTT v0.7 has been used for daily operations since Tuesday 07/27/2004 (OCR GND-140) with ROBOTT in Advisory and Auto modes. No data loss or command problems due to ROBOTT have occurred this week. - Work continues on developing ROBOTT v0.8 and testing v0.7. -- Of the 27 DRs fixed in ROBOTT v0.7, 18 have been verified, 2 have been canceled, 2 have failed and 5 still need to be tested. -- 25 new DRs have been written against ROBOTT v0.7. ============================================================================ Extra Spacecraft Activities: None ===================================================================== Anomalies: DOY 04212 (07/30/04) ACE Anomaly G04-0079 - Unable to Unlock AC1FE1A Display While attempting to configure workstations for support FOT found they couldn't unlock displays on String 1. TSMs notified and "dtlogin" process killed and restarted. IMPACT: None. DOY 04212 (07/30/04) ACE Anomaly G04-0080 - ROBOTT - Paging Not Running on ACEDDS TSMs had been working on ACEDDS and had terminated the cron process that makes sure the paging process is active. ROBOTT developer restarted the paging process. IMPACT: None. DOY 04213 (07/31/04) ACE Anomaly G04-0081 - ROBOTT - C&C Incorrectly Flagging Bad TLM/FWD Link C&C detected problems with the fwd link 7 times throughout the pass. There were no event messages that came up in TPOCC indicating any problems. IMPACT: None. C&C did pause itself during these periods, but there was no commanding when these pauses occurred. DOY 04214 (08/01/04) ACE Anomaly G04-0082 - ROBOTT - C&C Failure During Procedure G_ACEUP C&C results checking for g_aceup is set to 100 seconds. If the results checking rules are not satisfied, then C&C kills all procedures (if necessary) and re-executes g_aceup. C&C will attempt to run g_aceup 3 times. IMPACT: G_ACEUP restart unnecessary. Restart caused TPOCC failure which resulted in a reboot of the system. C&C did not send out any notification after it determined g_aceup did not successfully complete (even after the 3rd attempt.) DR CDSID 00021015 DOY 04214 (08/01/04) ACE Anomaly G04-0083 - ROBOTT - C&C Frozen TPOCC occasionally sets MF_QUALITY to BAD. For the first 2 instances C&C paused and resumed within 30 seconds. After the third instance, however, C&C did not resume. IMPACT: 10 minute telemetry gap in history files (TAPS captured data however). EVTRPT and CFGMON errors because S_PLBK & S_PLBK_COMPLETE run on different strings. GRI on string 2 did not reflect loads done on string 1. If the C&C had halted from a 2nd execution of g_aceup (prevented due to FOT intervention) then s_ops_plbk_complete would not have been executed. SSR failover would not have been enabled and g_end_day would not have been run (AOS time tag bins for the next day's pass would not have been loaded). DR CDSID 00021014 DOY 04213 (07/31/04) ACE Anomaly G04-0084 - Data Gaps Not Seen by TPOCC TPOCC did not generate any VC2 Sequence Error messages for DOY 213 and DOY 214 even though data was missing. The SSR Statistics showed that all data was captured. TPOCC still generated a frame with VC4 data. Investigation continues. IMPACT: Unknown. DOY 04216 (08/03/04) ACE Anomaly G04-0085 - ROBOTT Incorrectly Flagged Clock Calibration The tool "check_c_f.pl" incorrectly flags clock calibration as bad if the same digits in the DOY are found elsewhere in the "./log_dir/prepass.gen.log" file. For example, on DOY 215, one of the previous lines contained the number 218708215 (note the last 3 digits) which caused the error. Fixed for v0.8. IMPACT: None. DR CDSID 00021018 DOY 04216 (08/03/04) ACE Anomaly G04-0086 - ROBOTT - C&C Failure During Procedure G_ACEUP (Wee AR G04-0082) C&C results checking for g_aceup is set to 100 seconds. If the results checking is not satisfied then C&C kills all procedures (if necessary) and re-executes g_aceup. C&C will attempt to run g_aceup 3 times. IMPACT: Unnecessary reboot. DOY 04216 (08/03/04) ACE Anomaly G04-0087 - ROBOTT - C&C Repeated Preconditions At 13:59:02, the FOT started ULEIS_MOTOR_ERROR. Just before starting the procedure, C&C performed a /resync directive (which is expected). However, while at the 240 minute wait in ULEIS_MOTOR_ERROR another /resync directive was sent by C&C. IMPACT: None. DOY 04217 (08/04/04) ACE Anomaly G04-0088 - ADS Failure Received error when attempting to start ADS. Killed processes on workstation and rebooted the software. IMPACT: Delayed pass activities. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Glen A. Miller ACE Flight Operations Observatory Engineer Honeywell Technology Solutions Inc. Goddard Space Flight Center Building 14, Room W10A Mail Stop 428.2 Greenbelt, MD 20771 Office: 301-286-7071 Pager: 800-425-3174 Fax: 301-286-1729 gamiller@pop500.gsfc.nasa.gov ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~