SOT shift report 2001-10-31 H832 Start at 2001:304:03:30 GMT = 2001 Oct 30 10:30 pm EST End Oct 31 01:00 am EST ACIS Paul Plucinsky, Catherine Grant, Royce Buehler PLAN ---- Execute CAP752B to recover from an ACIS Threshold Crosssing Plane latchup. SUMMARY: ---------- We sent the command to ACIS to power-down the FEPs. We did NOT execute the contingency science run because the EPHIN P4 rate was too high. We therefore had to wait for the science run commanded by the load to verify that the Threshold Crossing Plane was unlocked. The normal CTI measurement demonstrated that the Threshold crossing plane had been "unlocked" and the data looked normal from all CCDs. The CAP was successful and ACIS should be back to normal. 1) Chandra state at the beginning of the Pass UTC 2001:304:03:40:19 (Oct31) f_ACE 3.58e+02 F_CRM 0.00e+00 Kp 1.7 R km 36793A OBT 2001:304:03:39:44 CTUVCDU 8084479 OBC s/w NRML FMT2_EPS CPEstat NORM OBT 120886784.34 ONLVCDU 8084464 OBC Errs 0 OBSID 61421 EPState SUN SIM TTpos -99616 HETG Angle 79.84 PCADMODE NPNT RA 320.998 Bus V 29.77 SIM FApos -467 LETG Angle 77.96 PCONTROL NPNT Dec -60.002 Bus I 36.35 AOFSTAR GUID Roll 290.423 ACA Object SSSSSSSS Dither ENAB HRC-I HV ON ACA ImFunc TTTTTNNN Dith Yang 6.64 Yaw Rate -0.25 HRC-S HV OFF ACA CCD Temp -10.4 Dith Zang 6.69 Pitch Rate -0.22 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.15 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.34 Batt 1 SOC 100.00% Avg HRMA Temp 70.58 FSS Beta 4.34 Batt 2 SOC 100.00% ACIS Stat7-0 66 Avg OBA Temp 51.13 SA Resolv 85.53 Batt 3 SOC 100.00% Cold Rad -125.5 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 17.62 RadMon DISA HRMA power 59.30 SCS 128 ACT -Y SA Amps 18.41 EPHIN Geom SMAL OBA power 154.40 SCS 129 ACT +Y SA Temp 114.20 E150 747707.3 SCS 130 ACT -Y SA Temp 114.81 E300 68459.9 Roll Mom. 4.883 SCS 107 INAC E1300 245.9 Pitch Mom. -10.456 UpL Cmd Acc 36063 EPH A-Leak 1.0200 P4GM 44140.9 Yaw Mom. 0.419 Cmd Rej A 65 EPH B-Leak 0.3480 P41GM 0.3 2) Detailed Timeline GMT 304:03:30 AOS on DSS-66 304:03:45 EPHIN rates E150 E300 E1300 P4 P41 889756.1 72696.9 226.6 49777.8 0.3 altitude 37,000 km FP Temperature = -119.4 C 304:04:15 EPHIN rates E150 E300 E1300 P4 P41 1024000.0 10871.1 12.7 22547.4 0.2 altitude 42,000 km FP Temperature = -118.9 C 304:04:30 EPHIN rates E150 E300 E1300 P4 P41 586926.8 2829.3 3.4 8216.8 0.1 altitude 44,000 km FP Temperature = -118.9 C 304:05:00 EPHIN rates E150 E300 E1300 P4 P41 224000.0 459.9 0.5 1327.9 0.1 altitude 48,000 km FP Temperature = -118.7 C 304:05:05 decide that we CANNOT execute the contingency run because the P4GM is still 4.5x the SCS107 trigger 304:05:30 EPHIN rates E150 E300 E1300 P4 P41 55609.8 46.2 0.3 110.4 0.0 altitude 48,000 km FP Temperature = -118.7 C 304:05:47 first command from the load to ACIS 304:05:52 startScience 304:06:05 first bias packets 304:06:06 no event packets mixed in, yippee ! 394:06:16 first event data the threshold crossings are changing, yippee !! the T-plane has been unlocked ! 304:05:30 EPHIN rates E150 E300 E1300 P4 P41 2786.6 1.6 0.0 1.1 0.0 altitude 57,000 km FP Temperature = -118.6 C 304:06:30 LOS 3) Chandra state at the end of the Pass UTC 2001:304:06:20:16 (Oct31) f_ACE 2.82e+02 F_CRM 0.00e+00 Kp 1.3 R km 57481A OBT 2001:304:06:19:54 CTUVCDU 8121947 OBC s/w NRML FMT2_NORM CPEstat NORM OBT 120896394.81 ONLVCDU 8121936 OBC Errs 0 OBSID 61421 EPState SUN SIM TTpos -99616 HETG Angle 79.84 PCADMODE NPNT RA 321.000 Bus V 30.08 SIM FApos -467 LETG Angle 77.96 PCONTROL NPNT Dec -59.998 Bus I 32.79 AOFSTAR GUID Roll 290.426 ACA Object SSSSSSSS Dither ENAB HRC-I HV ON ACA ImFunc TTTTTNNN Dith Yang -7.96 Yaw Rate -0.01 HRC-S HV OFF ACA CCD Temp -10.4 Dith Zang -3.74 Pitch Rate 0.18 OBSMode NEXT ACA Int Time 1.698 Roll Rate -0.30 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.40 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 4.42 Batt 2 SOC 100.00% ACIS Stat7-0 64 Avg OBA Temp 51.29 SA Resolv 85.53 Batt 3 SOC 100.00% Cold Rad -125.5 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 15.66 RadMon DISA HRMA power 56.70 SCS 128 ACT -Y SA Amps 16.64 EPHIN Geom SMAL OBA power 73.70 SCS 129 ACT +Y SA Temp 113.89 E150 2786.6 SCS 130 ACT -Y SA Temp 114.51 E300 1.6 Roll Mom. 4.809 SCS 107 INAC E1300 0.0 Pitch Mom. -12.808 UpL Cmd Acc 36263 EPH A-Leak 1.0200 P4GM 1.1 Yaw Mom. -0.096 Cmd Rej A 76 EPH B-Leak 0.3240 P41GM 0.0