Oct_04_2000_L440.txt Shift L440 Start at 2000:278:11:30:00 GMT = 2000 Oct 4 7:30am EDT End 2000 Oct 4 5:00pm EDT SOT shift report 2000-10-04 L440 See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Oct_04_2000_L440.txt SOT Lead Bill Podgorski SOT SC/ACA Rob Cameron FOT-SI Andrew Northrup HRC-SI ACIS-SI OTHER Mike McGuirk, Keith Havey Plan: - Running OCT0200D on descending leg in radiation zone. One hr COMM starting at 1330, then 5 hr COMM starting at 1620. Run LETG engineering test in this COMM. Solar radiation levels are low, although Kp is high. Seq # ObsID It Target start time SI Grat --------------------------------------------------------------------------------- 900010 00938 00 AX J1227+4421 2000:278:05:21:55.115 6.3 ACIS-I NONE ---- 61893 00 CAL-ER 2000:278:07:43:36.954 8.3 -- -- ACIS CTI ORBITAL EVENTS: 2000:276:00:34:51.878 159 EPERIGEE ORBIT PERIGEE 2000:276:05:36:31.776 160 XE1RADZ0 ELECTRON1 RADIATION EXIT0 2000:277:08:18:48.989 160 EAPOGEE ORBIT APOGEE 2000:278:10:03:27.497 160 EE1RADZ0 ELECTRON1 RADIATION ENTRY0 2000:278:16:02:35.176 160 EPERIGEE ORBIT PERIGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift 278:1130 LOS at start shift Chandra snapshot at last contact was corrupted (see note 1) AOS DSS-34 (Canberra) 278:1330 61893 (state nominal - see note 2) LOS DSS-43 278:1430 AOS DSS-27 278:1620 Execute LETG Bumper Test per CAP 653E 278:1623 Step 1 - Configure PCAD 278:1629 Step 2a,b - Select EPS format and telem format 4 278:1633 Step 2e - Test per script M_LETG_BUMPPOS_TEST 278:1636 Step 3 - Reconfigure PCAD 278:1832 Step 4 - Clean-up 278:1833 (see note 4 for results) LOS DSS-27 278:1923 End of shift 278:2100 NOTES/ISSUES/PROBLEMS --------------------- 1) Notes from 9:00am meeting: Operations (Darrell): - 2 supports last 24 hrs, both 34m, 2 SSR dumps - 1 load seg uplinked, good thru 281:1830 - Had a hard disk crash on GRETA server which caused loss of /home directories. GOT working to restore data, but initial indications are that current backup is not available. Restored data from May, working to restore data from mid-August backup tape (after LETG test). Mission Planning (Dan): - Load review on OCT10 load held yesterday. Some issues to resolve, will take until tomorrow due to activity concerning data loss. Spacecraft Engineering (Jeff): - LETG bumper test looks like a GO, even with loss of data SOT (Bill Podgorski): - Radiation levels low. - Chandra snapshot corrupted for a while last night because of activity related to GRETA data loss. OK now. DSOPS(Joy): - Three quick looks (see below) GOT(Chris Eagan): - GRETA Problem: The OCC Greta network experienced a significant failure on day 2000:277(Tue 3 Oct) at 2100Z approx. The disk drive on the server,Twinkie, on which the home directories reside failed. Impacts were: 1) Users could not login 2) Real-time telemetry could not be monitored 3) SSR data production could not be performed IST has restored some services by: 1) Installing a new drive on Twinkie for the home directories 2) Restoring this drive to the last tape backup which is May 2000 3) Rebooting workstations and conducting a data flow to test the ability to receive and display real-time telemetry System capabilities available at this time are: 1) Real-time telemetry display via axaffot1 account 2) SSR data production via the production account 3) Data stored locally on the individual greta workstations should be available System issues at this time are: 1) Users need to assess what capabilities are not operational and which products are not available 2) FST needs to determine whether a more recent system backup is available and coordinate a restore to it 3) FST needs to attempt to recovery the failed disk drive 4) IST needs to establish a routine backup procedure 5) IST needs to review and establish if necessary a failover procedure for restoring service to critical nodes Operations issues 1) OTG test for wed 4 Oct. Is the greta network ready to support this event? Problem Resolution Process 1) I will be the IST POC for this issue. Please route information to me 2) Status at 278:1425 UTC 2000:278:14:23:03 (Oct 4) f_ACE 1.53e+03 F_ACE 1.89e+07 Kp 4.7 R km 29629D OBT 2000:278:14:22:37 CTUVCDU 10281809 OBC s/w NRML FMT2_NORM CPEstat NORM OBT 87056557.03 ONLVCDU 10281800 OBC Errs 0 OBSID 61893 EPState SUN SIM TTpos -99616 HETG Angle 79.8 PCADMODE NPNT RA 154.083 Bus V 30.24 SIM FApos -535 LETG Angle 78.3 PCONTROL NPNT Dec 46.623 Bus I 35.08 AOFSTAR GUID Roll 42.824 ACA Object SSSSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTTTTTNN Dith Yang 7.92 Yaw Rate -0.26 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang 3.02 Pitch Rate -0.20 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.12 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.05 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 29.12 Batt 2 SOC 100.00% ACIS Stat7-0 66 Avg OBA Temp 51.13 SA Resolv 60.48 Batt 3 SOC 100.00% Cold Rad -127.9 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 16.44 RADMON DISA HRMA power 86.60 SCS 128 ACT -Y SA Amps 17.43 EPHIN Geom SMAL OBA power 138.30 SCS 129 ACT +Y SA Temp 112.97 E150 452682.9 SCS 130 ACT -Y SA Temp 113.58 E300 359.8 Roll Mom. -6.677 E1300 11.3 Pitch Mom. 5.445 UpL Cmd Acc 52239 EPH A-Leak 0.4720 P4GM 5571.8 Yaw Mom. -2.957 Cmd Rej A 10 EPH B-Leak 0.0840 P41GM 0.1 3) Quick Look data review(OK unless noted): Seq # ObsID It Target start time SI Grat Comments ---------------------------------------------------------------------------------------------------------- 800100 00924 00 MS 0906.5+1110 2000:276:18:19:54.059 30.0 ACIS-I NONE 900008 00936 00 AX J0431-0526 2000:277:09:12:16.284 4.0 ACIS-I NONE 800122 01654 00 MACS J0257.1-2325 2000:277:10:46:56.284 20.0 ACIS-I NONE 800033 00525 00 MS 0302.7+1658 2000:277:16:49:55.932 10.0 ACIS-I NONE 4) The LETG bumper test was executed per CAP 653E. The test used 1MC pulses (0.064 secs) to step in first the RETRACT direction, trying to drive into the A side RETR limit switch and then into the bumper, next in the INSERT direction far enough to get both A and B RETR limit switches to read not-retracted and finally in the RETRACT direction to reset the B side RETR simit switch to RETR. We went 24 steps in the RETRACT direction but did not see the A side LS go from NRET to RET, nor did we see evidence of hitting the bumper. We then moved a total of 69 steps in the RETRACT direction. At step 44 the B side RETR switch went to NRET (from RET). We continued an additional 25 steps to get a better reading on steps vs. pot angle changes. Finally, we went 46 steps in the RETRACT direction to get the B side RETR LS to read RETR. The data from the test must undergo analysis before we fully understand the results, but we did not see anything in the test which would indicate a safety problem in the way we are currently operating the OTGs, nor did we see anything which would indicate that we should change the approach to the new OTG flight software, although until the LETG bumper can be confirmed to be correctly deployed, we will not implement the SCS-based emergency retract of the LETG. The question of the correct deployment of the LETG bumper was not answered due to not moving far enough in the RETRACT direction during the initial series of moves.